TOHOKU UNIVERSITY Researchers - Toshimasa Wadayama

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Toshimasa Wadayama

Section

Graduate School of Environmental Studies

Job title

Professor

Degree

工学博士（東北大学）

researchmap

https://researchmap.jp/wadayamatoshimasa

J-GLOBAL ID

200901092176944013

Education 2

Tohoku University　Graduate School, Division of Engineering　金属材料工学

- 1987/03
Tohoku University　Faculty of Engineering　金属加工学科

- 1982/03

Committee Memberships 2

日本金属学会会誌・欧文誌編集委員会　日本金属学会会誌・欧文誌編集委員

2008/04 - Present
日本金属学会会誌・欧文誌編集委員会　日本金属学会会誌・欧文誌編集委員

2008/04 - 2010/03

Professional Memberships 3

The Japan Society of Vacuum and Surface Science
電気化学会
日本金属学会

Research Interests 4

fuel cell
catalysis
nano-materials
surface science

Research Areas 4

Nanotechnology/Materials / Energy chemistry / エネルギー学
Nanotechnology/Materials / Metallic materials / Surface and Interface
Nanotechnology/Materials / Structural and functional materials /
Nanotechnology/Materials / Thin-film surfaces and interfaces / Surface Physics

Awards 4

科研費審査員表彰

2016/09/30　日本学術振興会
平成９年度トーキン科学技術振興財団研究奨励賞

1998/10　財団法人トーキン科学技術振興財団　偏光変調赤外分光法の開発とそれによる半導体薄膜成長過程のその場測定に関する研究に対して
第１回日本金属学会奨励賞

1991/10　日本金属学会
第２９回金属助成会研究奨励賞

1989/07　金属助成会

Papers 160

Hydrogen Peroxide Generation and Hydrogen Oxidation Reaction on Pt/Co/Pt(111) and Pt/Co/Pt(100) Single-Crystal Model Catalyst Surface

Kenta Hayashi, Takeru Tomimori, Yoshihiro Chida, Naoto Todoroki, Toshimasa Wadayama

ACS Catalysis　14　(18)　14069-14077　2024/09/20

DOI： 10.1021/acscatal.4c03106 　

eISSN： 2155-5435
Efficient Ozone Evolution Anode of Tantalum Nitride with Cubic Crystal Structure

Ryoma Sakata, Ouga Ishibashi, Takafumi Kanauchi, Hiroyuki Kasumi, Naoto Todoroki, Satoru Matsumoto, Koki Ishigame, Toshimasa Wadayama

ACS Sustainable Chemistry & Engineering　2024/07/19
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acssuschemeng.4c02246 　

ISSN： 2168-0485

eISSN： 2168-0485
Enhanced Oxygen Reduction Reaction Activity on the Melamine-Modified Pt-High-Entropy Alloy Single-Crystal Lattice Stacking Surface

Takumi Kobayshi, Yoshihiro Chida, Naoto Todoroki, Toshimasa Wadayama

ACS Catalysis　11512-11521　2024/07/18
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acscatal.4c02191 　

ISSN： 2155-5435

eISSN： 2155-5435
Impact of Applied Potential Range on Corrosion Behavior of Stainless Steel Oxygen Evolution Electrode Under Potential Cycle Loading

Naoto Todoroki, Toshimasa Wadayama

2024
Publisher: Elsevier BV
DOI： 10.2139/ssrn.4780625 　
Pt-Surface Stabilization by High-Entropy Alloys for Enhancing Oxygen Reduction Reaction Property: Single-Crystal Model Catalyst Study

Yoshihiro Chida, Takeru Tomimori, Naoto Todoroki, Toshimasa Wadayama

Electrochemistry Communications　107657-107657　2023/12
Publisher: Elsevier BV
DOI： 10.1016/j.elecom.2023.107657 　

ISSN： 1388-2481
Suppressed Hydrogen Peroxide Generation and Enhanced Electrochemical Hydrogen Oxidation Activity for Tungsten-Oxide-Modified Platinum Surface Model Catalyst System

Kenta Hayashi, Hikaru Kamikawa, Naoto Todoroki, Toshimasa Wadayama

MATERIALS TRANSACTIONS　64　(10)　2431-2439　2023/10/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-mh2022004 　

ISSN： 1345-9678

eISSN： 1347-5320
Improving the Oxygen Evolution Activity and Stability of Nb-Doped TiO₂-Supported RuO₂ by a SnO₂ Interlayer: A Model Catalyst Study on Single-Crystal Oxide Heterostructures

Naoto Todoroki, Ryutaro Kudo, Kenta Hayashi, Mizuho Yokoi, Naomi Naraki, Toshimasa Wadayama

ACS Catalysis　11433-11440　2023/08/15
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acscatal.3c01525 　

ISSN： 2155-5435

eISSN： 2155-5435
Experimental study platform for electrocatalysis of atomic-level controlled high-entropy alloy surfaces

Yoshihiro Chida, Takeru Tomimori, Tomoaki Ebata, Noboru Taguchi, Tsutomu Ioroi, Kenta Hayashi, Naoto Todoroki, Toshimasa Wadayama

Nature Communications　14　(1)　2023/07/26
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-023-40246-5 　

eISSN： 2041-1723

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Abstract High-entropy alloys (HEAs) have attracted considerable attention to improve performance of various electrocatalyst materials. A comprehensive understanding of the relationship between surface atomic-level structures and catalytic properties is essential to boost the development of novel catalysts. In this study, we propose an experimental study platform that enables the vacuum synthesis of atomic-level-controlled single-crystal high-entropy alloy surfaces and evaluates their catalytic properties. The platform provides essential information that is crucial for the microstructural fundamentals of electrocatalysis, i.e., the detailed relationship between multi-component alloy surface microstructures and their catalytic properties. Nanometre-thick epitaxially stacking layers of Pt and equi-atomic-ratio Cr-Mn-Fe-Co-Ni, the so-called Cantor alloy, were synthesised on low-index single-crystal Pt substrates (Pt/Cr-Mn-Fe-Co-Ni/Pt(hkl)) as a Pt-based single-crystal alloy surface model for oxygen reduction reaction (ORR) electrocatalysis. The usefulness of the platform was demonstrated by showing the outperforming oxygen reduction reaction properties of high-entropy alloy surfaces when compared to Pt-Co binary surfaces.
Oxygen Reduction Reaction Activity Enhancement of Dry-Process-Synthesized Pt(111)/Nb:SnO<sub>2</sub>(101)/Pt(111) Coherent Lattice Stacking Model Catalyst Surface

Yoshihiro Chida, Hikaru Kamikawa, Naoto Todoroki, Toshimasa Wadayama

MATERIALS TRANSACTIONS　2023
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2023172 　

ISSN： 1345-9678

eISSN： 1347-5320
Surface modification of gold by carbazole dendrimers for improved carbon dioxide electroreduction

Sota Yoshida, Masaki Sampei, Naoto Todoroki, Eri Hisamura, Kohei Nakao, Ken Albrecht, Toshimasa Wadayama

Chemical Communications　2023
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d3cc00350g 　

ISSN： 1359-7345

eISSN： 1364-548X

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Surface modification by carbazole dendrimers, in particular, 9-phenylcarbazole, enhances electrochemical CO₂ conversion to CO on gold.
Stainless Steel Anode for Alkaline Water Electrolysis: Recent Progress in Active and Durable Surface Catalyst Layer Generation

Naoto Todoroki, Toshimasa Wadayama

MATERIALS TRANSACTIONS　64　(10)　2376-2385　2023
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-mh2022002 　

ISSN： 1345-9678

eISSN： 1347-5320
Enhanced electrochemical hydrogen oxidation reaction and suppressed hydrogen peroxide generation properties on Pt/Ir(111) bimetallic surfaces

Kenta Hayashi, Takeru Tomimori, Riku Sato, Naoto Todoroki, Toshimasa Wadayama

Physical Chemistry Chemical Physics　2023
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d2cp05430b 　

ISSN： 1463-9076

eISSN： 1463-9084

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Simultaneous accomplishment of high hydrogen oxidation reaction (HOR) activity and suppressed hydrogen peroxide (H₂O₂) generation is desired for anode catalysts of polymer electrolyte fuel cells. 0.3 monolayer-thick-Pt-deposited Ir(111) showed threefold...
Surface microstructures and oxygen evolution properties of cobalt oxide deposited on Ir(111) and Pt(111) single crystal substrates

Naoto Todoroki, Hiroto Tsurumaki, Arata Shinomiya, Toshimasa Wadayama

Electrochemical Science Advances　2022/09/11
Publisher: Wiley
DOI： 10.1002/elsa.202200007 　

ISSN： 2698-5977

eISSN： 2698-5977
Dissolution of constituent elements from various austenitic stainless steel oxygen evolution electrodes under potential cycle loadings

Naoto Todoroki, Toshimasa Wadayama

International Journal of Hydrogen Energy　47　(77)　32753-32762　2022/09
Publisher: Elsevier BV
DOI： 10.1016/j.ijhydene.2022.07.175 　

ISSN： 0360-3199
Hydrogen peroxide generation and hydrogen oxidation reactions of vacuum-prepared Ru/Ir(111) bimetallic surfaces

Kenta Hayashi, Keisuke Kusunoki, Takeru Tomimori, Riku Sato, Naoto Todoroki, Toshimasa Wadayama

Physical Chemistry Chemical Physics　24　(23)　14277-14283　2022/05
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d2cp01261h 　

ISSN： 1463-9076

eISSN： 1463-9084

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The electrochemical hydrogen oxidation reaction activity of a well-defined Ir–Ru bimetallic surface alloy is closely related to Ir/Ru atomic ratios and Ir-dimer (Ir₂) and/or trimer (Ir₃) ensemble probability at the topmost surface.
Nanostructures and Oxygen Evolution Overpotentials of Surface Catalyst Layers Synthesized on Various Austenitic Stainless Steel Electrodes Peer-reviewed

Naoto Todoroki, Arata Shinomiya, Toshimasa Wadayama

Electrocatalysis　13　(2)　113-126　2022/01/11
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s12678-022-00705-x 　

ISSN： 1868-2529

eISSN： 1868-5994
Abnormal Metal Bond Distances in PtAu Alloy Nanoparticles: In Situ Back-Illumination XAFS Investigations of the Structure of PtAu Nanoparticles on a Flat HOPG Substrate Prepared by Arc Plasma Deposition Peer-reviewed

Bing Hu, Bapurao Bharate, Juan D. Jimenez, Jochen Lauterbach, Naoto Todoroki, Toshimasa Wadayama, Kotaro Higashi, Tomoya Uruga, Yasuhiro Iwasawa, Hiroko Ariga-Miwa, Satoru Takakusagi, Kiyotaka Asakura

The Journal of Physical Chemistry C　126　(2)　1006-1016　2022/01/10
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.jpcc.1c08393 　

ISSN： 1932-7447

eISSN： 1932-7455
Oxygen reduction reaction properties of vacuum-deposited Pt on thermally grown epitaxial graphene layers Peer-reviewed

Masashi Watanabe, Takafumi Kanauchi, Yoshihiro Chida, Kenta Hayashi, Naoto Todoroki, Toshimasa Wadayama

Journal of Vacuum Science & Technology A　40　(1)　013216-013216　2022/01
Publisher: American Vacuum Society
DOI： 10.1116/6.0001379 　

ISSN： 0734-2101

eISSN： 1520-8559
Atomically resolved interface structures of vacuum-deposited Pt on SnO2(110), (101), and (111) Peer-reviewed

Yoshihiro Chida, Naoto Todoroki, Toshimasa Wadayama

Journal of Vacuum Science & Technology A　39　(6)　060402-060402　2021/12
Publisher: American Vacuum Society
DOI： 10.1116/6.0001348 　

ISSN： 0734-2101

eISSN： 1520-8559
Hydrogen Peroxide Generation and Hydrogen Oxidation Reaction Properties of Ir(111)-, (100)-, and (110)-Low-Index Single-Crystal Surfaces Peer-reviewed

Kenta Hayashi, Takeru Tomimori, Yoshihiro Chida, Naoto Todoroki, Toshimasa Wadayama

The Journal of Physical Chemistry C　125　(39)　21481-21487　2021/10/07
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.jpcc.1c07322 　

ISSN： 1932-7447

eISSN： 1932-7455
Activity for the ORR on Pt-Pd-Co ternary alloy electrodes is markedly affected by surface structure and composition Peer-reviewed

Mashu Torihata, Masashi Nakamura, Naoto Todoroki, Toshimasa Wadayama, Nagahiro Hoshi

Electrochemistry Communications　125　107007-107007　2021/03
Publisher: Elsevier BV
DOI： 10.1016/j.elecom.2021.107007 　

ISSN： 1388-2481
Oxygen Reduction Reaction of Third Element-Modified Pt/Pd(111): Effect of Atomically Controlled Ir Locations on the Activity and Durability Peer-reviewed

Keisuke Kusunoki, Daisuke Kudo, Kenta Hayashi, Yoshihiro Chida, Naoto Todoroki, Toshimasa Wadayama

ACS Catalysis　11　(3)　1554-1562　2021/01/15
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acscatal.0c04054 　

ISSN： 2155-5435

eISSN： 2155-5435
Electrochemical stability of stainless-steel-made anode for alkaline water electrolysis: Surface catalyst nanostructures and oxygen evolution overpotentials under applying potential cycle loading Peer-reviewed

Naoto Todoroki, Toshimasa Wadayama

Electrochemistry Communications　122　106902-106902　2021/01
Publisher: Elsevier BV
DOI： 10.1016/j.elecom.2020.106902 　

ISSN： 1388-2481
Dry synthesis of single-nanometer-scale Pt Si fine particles for electrocatalysis Peer-reviewed

Naoto Todoroki, Shuntaro Takahashi, Kotaro Kawaguchi, Yusuke Fugane, Toshimasa Wadayama

Journal of Electroanalytical Chemistry　114492-114492　2020/07
Publisher: Elsevier BV
DOI： 10.1016/j.jelechem.2020.114492 　

ISSN： 1572-6657
Online Electrochemical Mass Spectrometry Combined with the Rotating Disk Electrode Method for Direct Observations of Potential-Dependent Molecular Behaviors in the Electrode Surface Vicinity Peer-reviewed

Naoto Todoroki, Hiroto Tsurumaki, Hiroki Tei, Tomohiro Mochizuki, Toshimasa Wadayama

Journal of The Electrochemical Society　167　(10)　106503-106503　2020/06/11
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ab9960 　

eISSN： 1945-7111
Model building analysis – a novel method for statistical evaluation of Pt L3-edge EXAFS data to unravel the structure of Pt-alloy nanoparticles for the oxygen reduction reaction on highly oriented pyrolytic graphite Peer-reviewed

Felix E. Feiten, Shuntaro Takahashi, Oki Sekizawa, Yuki Wakisaka, Tomohiro Sakata, Naoto Todoroki, Tomoya Uruga, Toshimasa Wadayama, Yasuhiro Iwasawa, Kiyotaka Asakura

Physical Chemistry Chemical Physics　2020
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/c9cp06891k 　

ISSN： 1463-9076

eISSN： 1463-9084

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<p>We have developed a novel analytical method combining model building and statistical evaluation to determine the structure of multimetallic nanoparticles from EXAFS of a single adsorption edge.</p>
Heterolayered Ni–Fe Hydroxide/Oxide Nanostructures Generated on a Stainless-Steel Substrate for Efficient Alkaline Water Splitting Peer-reviewed

Naoto Todoroki, Toshimasa Wadayama

ACS Applied Materials and Interfaces　11　44161-44169　2019/11
よく規定された合金系電極触媒表面モデルのドライプロセス合成と特性評価 Invited

轟直人, 和田山智正

250-257　2019/08
Ligand-Effect-Induced Oxygen Reduction Reaction Activity Enhancement for Pt/Zr/Pt(111) Surfaces with Tensile Strain Relieved by Stacking Faults Peer-reviewed

Daisuke Kudo, Soma Kaneko, Rikiya Myochi, Yoshihiro Chida, Naoto Todoroki, Tadao Tanabe, Toshimasa Wadayama

ACS Applied Energy Materials　2　(7)　4597-4601　2019/07

DOI： 10.1021/acsaem.9b00873 　

ISSN： 2574-0962
Electrochemical CO2 Reduction on Bimetallic Surface Alloys: Enhanced Selectivity to CO for Co/Au(110) and to H2 for Sn/Au(110) Peer-reviewed

N. Todoroki, H. Tei, T. Miyakawa, H. Tsurumaki, T. Wadayama

ChemElectroChem　6　3101-3107　2019/06

DOI： 10.1002/celc.201900725 　
Oxygen Reduction Reaction Activity of Nano-Flake Carbon-Deposited Pt75Ni25(111) Surfaces Peer-reviewed

Naoto Todoroki, Ren Sasakawa, Keisuke Kusunoki, Toshimasa Wadayama

Electrocatalysis　10　(3)　232-242　2019/05

DOI： 10.1007/s12678-019-00517-6 　
Effective surface termination with Au on PtCo@Pt core-shell nanoparticle: Microstructural investigations and oxygen reduction reaction properties Peer-reviewed

Shuntaro Takahashi, Naoto Todoroki, Rikiya Myochi, Tetsuro Nagao, Noboru Taguchi, Tsutomu Ioroi, Felix E. Feiten, Yuki Wakisaka, Kiyotaka Asakura, Oki Sekizawa, Tomohiro Sakata, Shuntaro Takahashi, Naoto Todoroki, Rikiya Myochi, Tetsuro Nagao, Noboru Taguchi, Tsutomu Ioroi, Felix E.Feiten, Yuki Wakisaka, Kiyotaka Asakura, Oki Sekizawa, Tomohiro Sakata, Kotaro Higashie, Tomoya Urugade, Yasuhiro Iwasawa, Toshimasa Wadayama

Journal of Electroanalytical Chemistry　842　1-7　2019/05

DOI： 10.1016/j.jelechem.2019.04.053 　

ISSN： 1572-6657
Surface Atomic Arrangement Dependence of Electrochemical CO2 Reduction on Gold: Online Electrochemical Mass Spectrometric Study on Low-Index Au(hkl) Surfaces Peer-reviewed

Naoto Todoroki, Hiroki Tei, Hiroto Tsurumaki, Taku Miyakawa, Tatsuhiko Inoue, Toshimasa Wadayama

ACS catalysis　9　(2)　1383-1388　2019/01

DOI： 10.1021/acscatal.8b04852 　
Oxygen Reduction Reaction Properties of Dry-Process-Synthesized Pt/Graphene/SiC (0001) Model Catalyst Surfaces Peer-reviewed

M Watanabe, J Moon, T Tanabe, N Todoroki, T Wadayama

ECS Transactions　86　(13)　525-530　2018/10

DOI： 10.1149/08613.0525ecst 　
Rotating Disk Electrode–Online Electrochemical Mass Spectrometry for Oxygen Reduction Reaction on Pt Electrode Surfaces Peer-reviewed

H Tsurumaki, T Mochizuki, H Tei, N Todoroki, T Wadayama

ECS Transaction　86　(13)　447-452　2018/10

DOI： 10.1149/08613.0447ecst 　
Oxygen Reduction Reaction Properties for Dry-Process Synthesized Pt/TaCx Nanoparticles Peer-reviewed

R Myochi, T Nagao, Y Fugane, S Takahashi, N Todoroki, T Wadayama

ECS Transactions　86　(13)　519-524　2018/10

DOI： 10.1149/08613.0519ecst 　
Oxygen Reduction and Oxygen Evolution Reaction Activity on Co/Pt (111) Surfaces in Alkaline Solution Peer-reviewed

N Todoroki, T Wadayama

ECS Transactions　86　(13)　569-574　2018/10

DOI： 10.1149/08613.0569ecst 　
Oxygen Reduction Reaction Activity for Strain-Controlled Single Crystal Pt-Shells Invited Peer-reviewed

Soma Kaneko, Rikiya Myochi, Hirofumi Watanabe, Yohe Bando, Shuntaro Takahashi, Naoto Todoroki, Tadao Tanabe, Toshimasa Wadayama

Fuel Cells　18　73-79　2018/08
Oxygen Reduction Reaction Activity for Cobalt-Deposited Pt(111) Model Catalyst Surfaces in Alkaline Solution Peer-reviewed

Naoto TODOROKI, Toshimasa WADAYAMA

Electrochemistry　86　(5)　243-245　2018/06

DOI： 10.5796/electrochemistry.18-00024 　
Oxygen Reduction Reaction Activity of Pt supported on Graphene Model

Watanabe Masashi, Kanauchi Takafumi, Moon Jungwon, Tanabe Tadao, Todoroki Naoto, Wadayama Toshimasa

Abstract of annual meeting of the Surface Science of Japan　2018　243　2018
Publisher: The Japan Society of Vacuum and Surface Science
DOI： 10.14886/sssj2008.2018.0_243 　

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Oxygen reduction reaction (ORR) proceeds at the cathode of polymer electrolyte fuel cell (PEFC). Currently, Pt nanoparticle supported on carbon black (Pt/C) catalysts is widely used for accelerating the ORR rates. In this study, to clarify the effect of the interactions between Pt nanoparticles and carbon supports, we investigated the ORR properties of Pt supported on multilayer graphene and on defect-induced graphene models.
Alloy-composition-dependent oxygen reduction reaction activity and electrochemical stability of Pt-based bimetallic systems: A model electrocatalyst study of Pt/PtxNi100-x(111) Peer-reviewed

Naoto Todoroki, Ryutaro Kawamura, Masato Asano, Ren Sasakawa, Shuntaro Takahashi, Toshimasa Wadayama

Physical Chemistry Chemical Physics　20　(17)　11994-12004　2018
Publisher: Royal Society of Chemistry
DOI： 10.1039/c8cp01217b 　

ISSN： 1463-9076
Ultrahigh Vacuum Synthesis of Strain-Controlled Model Pt(111)-Shell Layers: Surface Strain and Oxygen Reduction Reaction Activity Peer-reviewed

Soma Kaneko, Rikiya Myochi, Shuntaro Takahashi, Naoto Todoroki, Toshimasa Wadayama, Tadao Tanabe

JOURNAL OF PHYSICAL CHEMISTRY LETTERS　8　(21)　5360-5365　2017/11

DOI： 10.1021/acs.jpclett.7b02525 　

ISSN： 1948-7185
Communication-Electrochemical Stability of Pt/Pd(111) Model Core-Shell Structure in 80 degrees C Perchloric Acid Peer-reviewed

N. Todoroki, Y. Bando, Y. Tani, S. Kaneko, H. Watanabe, S. Takahashi, T. Wadayama

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　164　(9)　F908-F910　2017

DOI： 10.1149/2.0571709jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Dealloying of Nitrogen-Introduced Pt−Co Alloy Nanoparticles: Preferential Core−Shell Formation with Enhanced Activity for Oxygen Reduction Reaction Peer-reviewed

Shuntaro Takahashi, Naoki Takahashi, Naoto Todoroki, Toshimasa Wadayama

ACS OMEGA　1　1247-1252　2016/12/15

DOI： 10.1021/acsomega.6b00412 　
Highly Enhanced Oxygen Reduction Reaction Activity and Electrochemical Stability of Pt/Ir(111) Bimetallic Surfaces Peer-reviewed

Naoto Todoroki, Hirofumi Watanabe, Takayuki Kondo, Soma Kaneko, Toshimasa Wadayama

ELECTROCHIMICA ACTA　222　(20)　1616-1621　2016/12

DOI： 10.1016/j.electacta.2016.11.149 　

ISSN： 0013-4686

eISSN： 1873-3859
ORR activity and electrochemical stability for well-defined topmost and interface structures of the Pt/Pd(111) bimetallic system Peer-reviewed

Naoto Todoroki, Yohe Bando, Hirofumi Watanabe, Yuki Tani, Toshimasa Wadayama

ELECTROCHIMICA ACTA　212　(10)　822-827　2016/09

DOI： 10.1016/j.electacta.2016.07.068 　

ISSN： 0013-4686

eISSN： 1873-3859
Oxygen Reduction Reaction Activity for Strain-Controlled Pt-Based Model Alloy Catalysts: Surface Strains and Direct Electronic Effects Induced by Alloying Elements Peer-reviewed

Masato Asano, Ryutaro Kawamura, Ren Sasakawa, Naoto Todoroki, Toshimasa Wadayama

ACS CATALYSIS　6　(8)　5285-5289　2016/08

DOI： 10.1021/acscatal.6b01466 　

ISSN： 2155-5435
Electrochemical Reduction of CO2 on Ni- and Pt-Epitaxially Grown Cu(111) Surfaces Peer-reviewed

Naoto Todoroki, Naohiro Yokota, Shoko Nakahata, Hiroki Nakamura, Toshimasa Wadayama

ELECTROCATALYSIS　7　(1)　97-103　2016/01

DOI： 10.1007/s12678-015-0286-6 　

ISSN： 1868-2529

eISSN： 1868-5994
Surface Structures and Electrochemical Stabilities for Pt/Pd(111) Model Electrocatalysts Peer-reviewed

N. Todoroki, Y. Bando, Y. Tani, S. Kaneko, H. Watanabe, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)　75　(14)　741-746　2016

DOI： 10.1149/07514.0741ecst 　

ISSN： 1938-5862
ORR Properties for Model Pt-Shell Layers Prepared on Nitrogen-Beam Irradiated Pt25Ni75(111) Substrate Peer-reviewed

M. Asano, R. Kawamura, N. Todoroki, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)　75　(14)　809-814　2016

DOI： 10.1149/07514.0809ecst 　

ISSN： 1938-5862
Oxygen Reduction Reaction Activity and Durability for Model Pt Shell Layers on Ir(111) Prepared by Molecular Beam Epitaxy Peer-reviewed

H. Watanabe, S. Kaneko, N. Todoroki, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)　75　(14)　815-820　2016

DOI： 10.1149/07514.0815ecst 　

ISSN： 1938-5862
Oxygen Reduction Reaction Activity and Durability for Pt/TaNx Model Catalysts Fabricated in Ultra-High-Vacuum Peer-reviewed

S. Takahashi, N. Takahashi, N. Todoroki, T. Tanabe, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)　75　(14)　821-826　2016

DOI： 10.1149/07514.0821ecst 　

ISSN： 1938-5862
On-Line Mass Spectrometry for Ethanol Oxidation on Well-Defined Sn/Pt(hkl) Electrode Surfaces Peer-reviewed

H. Nakamura, T. Inoue, T. Matsuda, N. Todoroki, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16)　75　(14)　1029-1033　2016

DOI： 10.1149/07514.1029ecst 　

ISSN： 1938-5862
Pt-Ni Nanoparticle-Stacking Thin Film: Highly Active Electrocatalysts for Oxygen Reduction Reaction Peer-reviewed

Naoto Todoroki, Takashi Kato, Takehiro Hayashi, Shuntaro Takahashi, Toshimasa Wadayama

ACS CATALYSIS　5　(4)　2209-2212　2015/04

DOI： 10.1021/acscatal.5b00065 　

ISSN： 2155-5435
Electrochemical Properties of Pt Epitaxial Layers Formed on Pd(111) in Ultra-High Vacuum Peer-reviewed

Y. Bando, Y. Takahashi, E. Ueta, N. Todoroki, T. Wadayama

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　162　(4)　F463-F467　2015

DOI： 10.1149/2.0951504jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Electrochemical structural stability of au-modified Pt nanoparticles prepared by arc-plasma deposition Peer-reviewed

Shuntaro Takahashi, Hiroshi Chiba, Naoto Todoroki, Toshimasa Wadayama

ECS Transactions　69　(17)　657-661　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06917.0657ecst 　

ISSN： 1938-6737 1938-5862
Oxygen reduction reaction activities for various-monolayer-thick Pt shells on PtxNi100-x(111) Peer-reviewed

Masato Asano, Ryutaro Kawamura, Naoto Todoroki, Toshimasa Wadayama

ECS Transactions　69　(17)　619-624　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06917.0619ecst 　

ISSN： 1938-6737 1938-5862
Effects of core-shell interface structures on ORR activities: A model catalyst study of Pt/Pd(111) Peer-reviewed

Naoto Todoroki, Yohe Bando, Hirofumi Watanabe, Toshimasa Wadayama

ECS Transactions　69　(17)　315-320　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06917.0315ecst 　

ISSN： 1938-6737 1938-5862
Oxygen reduction reaction activity and structural stability of Pt-Au nanoparticles prepared by arc-plasma deposition Peer-reviewed

Shuntaro Takahashi, Hiroshi Chiba, Takashi Kato, Shota Endo, Takehiro Hayashi, Naoto Todoroki, Toshimasa Wadayama

PHYSICAL CHEMISTRY CHEMICAL PHYSICS　17　(28)　18638-18644　2015

DOI： 10.1039/c5cp02048d 　

ISSN： 1463-9076

eISSN： 1463-9084
Microscopic surface structures and ORR activities for vacuum-deposited Pt/Ni/Pt(111) and Pt/Ni/Pt(110) sandwich structures Peer-reviewed

N. Todoroki, T. Dasai, Y. Asakimori, T. Wadayama

JOURNAL OF ELECTROANALYTICAL CHEMISTRY　724　15-20　2014/06

DOI： 10.1016/j.jelechem.2014.04.008 　

ISSN： 1572-6657

eISSN： 1873-2569
Electrochemical Properties for UHV-prepared Pt/M Well-defined Single Crystal Surfaces Invited Peer-reviewed

N. Todoroki, Y. Iijima, Y. Takahashi, T. Kondo, Y. Asakimori, Y. Bando, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 14　64　(3)　63-74　2014

DOI： 10.1149/06403.0063ecst 　

ISSN： 1938-5862
Oxygen Reduction Reaction Activity of Pt/Ni/Pt(111) Well-defined Model Catalyst Surfaces Peer-reviewed

N. Todoroki, Y. Asakimori, T. Wadayama

POLYMER ELECTROLYTE FUEL CELLS 13 (PEFC 13)　58　(1)　565-573　2013

DOI： 10.1149/05801.0565ecst 　

ISSN： 1938-5862
Oxygen reduction reaction activities for Pt-enriched Co/Pt(111), Co/Pt(100), and Co/Pt(110) model catalyst surfaces prepared by molecular beam epitaxy Invited Peer-reviewed

Y. Yamada, K. Miyamoto, T. Hayashi, Y. Iijima, N. Todoroki, T. Wadayama

SURFACE SCIENCE　607　54-60　2013/01

DOI： 10.1016/j.susc.2012.08.016 　

ISSN： 0039-6028
Structure and electrochemical stability of Pt-enriched Ni/Pt(111) topmost surface prepared by molecular beam epitaxy Peer-reviewed

Naoto Todoroki, Yuki Iijima, Ryota Takahashi, Yu Asakimori, Toshimasa Wadayama

Journal of the Electrochemical Society　160　(6)　F591-F596　2013

DOI： 10.1149/2.082306jes 　

ISSN： 0013-4651 1945-7111
Oxygen Reduction Reaction Activities for Pt/Au(hkl) Bimetallic Surfaces Prepared by Molecular Beam Epitaxy Peer-reviewed

Yuki Iijima, Takayuki Kondo, Yu Takahashi, Yohe Bando, Naoto Todoroki, Toshimasa Wadayama

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　160　(8)　F898-F904　2013

DOI： 10.1149/2.011309jes 　

ISSN： 0013-4651
Platinum-enriched Ni/Pt(111) surfaces prepared by molecular beam epitaxy: Oxygen reduction reaction activity and stability Peer-reviewed

Naoto Todoroki, Ryota Takahashi, Yuki Iijima, Yoshinori Yamada, Takehiro Hayashi, Toshimasa Wadayama

Materials Transactions　54　(9)　1735-1740　2013

DOI： 10.2320/matertrans.M2013061 　

ISSN： 1345-9678
Effective shell layer thickness of platinum for oxygen reduction reaction alloy catalysts Peer-reviewed

Naoto Todoroki, Yu Asakimori, Toshimasa Wadayama

PHYSICAL CHEMISTRY CHEMICAL PHYSICS　15　(41)　17771-17774　2013

DOI： 10.1039/c3cp53340a 　

ISSN： 1463-9076

eISSN： 1463-9084
Oxygen reduction reaction activities of Pt/Au(111) surfaces prepared by molecular beam epitaxy Peer-reviewed

Yuki Iijima, Yu Takahashi, Ken-ichi Matsumoto, Takehiro Hayashi, Naoto Todoroki, Toshimasa Wadayama

JOURNAL OF ELECTROANALYTICAL CHEMISTRY　685　79-85　2012/10

DOI： 10.1016/j.jelechem.2012.09.007 　

ISSN： 1572-6657
Electrochemical stability of pt-enriched topmost surface of Ni/Pt(111) prepared by molecular beam epitaxy Peer-reviewed

N. Todoroki, Y. Iijima, R. Takahashi, Y. Yamada, K. Matsumoto, T. Hayashi, T. Wadayama

ECS Transactions　50　(2)　1707-1713　2012

DOI： 10.1149/05002.1707ecst 　

ISSN： 1938-5862 1938-6737
ORR activity enhancement of MBE-prepared Pt monolayer on Au single-crystal substrate Peer-reviewed

Y. Iijima, Y. Takahashi, K. Matsumoto, N. Todoroki, T. Wadayama

ECS Transactions　50　(36)　45-55　2012

DOI： 10.1149/05036.0045ecst 　

ISSN： 1938-5862 1938-6737
Outermost Surface Structures and Oxygen Reduction Reaction Activities of Co/Pt(111) Bimetallic Systems Fabricated Using Molecular Beam Epitaxy Peer-reviewed

Toshimasa Wadayama, Hirosato Yoshida, Koichiro Ogawa, Naoto Todoroki, Yoshinori Yamada, Kanji Miyamoto, Yuki Iijima, Tatsuya Sugawara, Kazuki Arihara, Seiho Sugawara, Kazuhiko Shinohara

JOURNAL OF PHYSICAL CHEMISTRY C　115　(38)　18589-18596　2011/09

DOI： 10.1021/jp203845u 　

ISSN： 1932-7447
Oxygen reduction reaction activities of Ni/Pt(111) model catalysts fabricated by molecular beam epitaxy Peer-reviewed

Toshimasa Wadayama, Naoto Todoroki, Yoshinori Yamada, Tatsuya Sugawara, Kanji Miyamoto, Yuki Iijama

ELECTROCHEMISTRY COMMUNICATIONS　12　(8)　1112-1115　2010/08

DOI： 10.1016/j.elecom.2010.05.042 　

ISSN： 1388-2481
Carbon monoxide adsorption on Co deposited Pt(100)-hex: IRRAS and LEED investigations Peer-reviewed

T. Wadayama, H. Yoshida, K. Ogawa, N. Todoroki, Y. Yamada

APPLIED SURFACE SCIENCE　256　(14)　4517-4521　2010/05

DOI： 10.1016/j.apsusc.2010.02.039 　

ISSN： 0169-4332
Carbon monoxide adsorption on cobalt-deposited platinum single crystal surfaces investigated by IR reflection-absorption and low-energy electron diffraction Peer-reviewed

Hirosato Yoshida, Koichiro Ogawa, Naoto Todoroki, Yoshinobu Yamada, Toshimasa Wadayama

e-Journal of Surface Science and Nanotechnology　8　161-166　2010/04/17

DOI： 10.1380/ejssnt.2010.161 　

ISSN： 1348-0391
Infrared reflection absorption spectral study for CO adsorption on Pd/Pt(111) bimetallic surfaces Peer-reviewed

N. Todoroki, H. Osano, T. Maeyama, H. Yoshida, T. Wadayama

APPLIED SURFACE SCIENCE　256　(4)　943-947　2009/11

DOI： 10.1016/j.apsusc.2009.05.070 　

ISSN： 0169-4332
Carbon monoxide adsorption on Ni/Pt(111) surfaces investigated by infrared reflection absorption spectroscopy Peer-reviewed

Toshimasa Wadayama, Hirosato Yoshida, Naoto Todoroki, Shogo Oda

e-Journal of Surface Science and Nanotechnology　7　230-233　2009/04/04

DOI： 10.1380/ejssnt.2009.230 　

ISSN： 1348-0391
IRRAS and TPD investigations of carbon monoxide adsorption on MBE grown Fe on Pt(100) Peer-reviewed

Toshimasa Wadayama, Hirosato Yoshida, Naoto Todoroki, Shogo Oda

e-Journal of Surface Science and Nanotechnology　7　245-248　2009/04/04

DOI： 10.1380/ejssnt.2009.245 　

ISSN： 1348-0391
Infrared Reflection Absorption Study for Carbon Monoxide Adsorption on Chromium Deposited Cu(100) Surfaces Peer-reviewed

T. Wadayama, H. Yoshida, S. Oda, N. Todoroki

MATERIALS TRANSACTIONS　50　(4)　819-824　2009/04

DOI： 10.2320/matertrans.MRA2008442 　

ISSN： 1345-9678

eISSN： 1347-5320
Carbon monoxide adsorption on Pd-deposited Cu(110) surface: Infrared reflection absorption and temperature programmed desorption studies Peer-reviewed

T. Wadayama, H. Osano, H. Yoshida, S. Oda, N. Todoroki

APPLIED SURFACE SCIENCE　254　(17)　5380-5384　2008/06

DOI： 10.1016/j.apsusc.2008.02.061 　

ISSN： 0169-4332
Infrared reflection-absorption study of carbon monoxide adsorption on Fe/Pt(111) bimetallic surfaces Peer-reviewed

Toshimasa Wadayama, Hiroshi Osano, Toshiaki Maeyama, Hirosato Yoshida, Koji Murakami, Naoki Todoroki, Shogo Oda

JOURNAL OF PHYSICAL CHEMISTRY C　112　(24)　8944-8950　2008/06

DOI： 10.1021/jp712095w 　

ISSN： 1932-7447
Bias-voltage induced surface reaction of para-nitrobenzoic acid adsorbed on Ag/AlO(x)/Al tunnel junction Peer-reviewed

T. Wadayama, M. Yokawa, K. Murakami, Y. Baba

PROCEEDINGS OF THE 17TH INTERNATIONAL VACUUM CONGRESS/13TH INTERNATIONAL CONFERENCE ON SURFACE SCIENCE/INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY　100　(1)　072034　2008

DOI： 10.1088/1742-6596/100/7/072034 　

ISSN： 1742-6588
Infrared reflection absorption study of carbon monoxide adsorption on Fe-deposited Pt(111) surface Peer-reviewed

T. Wadayama, H. Osano, K. Murakami, T. Maeyama, H. Yoshida

PROCEEDINGS OF THE 17TH INTERNATIONAL VACUUM CONGRESS/13TH INTERNATIONAL CONFERENCE ON SURFACE SCIENCE/INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY　100　(7)　012007　2008

DOI： 10.1088/1742-6596/100/1/012007 　

ISSN： 1742-6588
Infrared reflection absorption study of carbon monoxide adsorption on Cu(100)-c(2x2)-Pd surfaces formed by palladium vacuum-depositions at various temperatures Peer-reviewed

T. Wadayama, H. Osano, K. Hamade, H. Yoshida, T. Maeyama

SURFACE SCIENCE　601　(10)　2214-2222　2007/05

DOI： 10.1016/j.susc.2007.03.033 　

ISSN： 0039-6028
Infrared reflection absorption study of carbon monoxide adsorption on Pd/Cu(111) Peer-reviewed

T. Wadayama, K. Abe, H. Osano

APPLIED SURFACE SCIENCE　253　(5)　2540-2546　2006/12

DOI： 10.1016/j.apsusc.2006.05.014 　

ISSN： 0169-4332
Surface enhanced Raman scattering of organic sample powders spread over vacuum-evaporated silver thin film Peer-reviewed

T. Wadayama, M. Oishi, A. Hatta

APPLIED SURFACE SCIENCE　253　(5)　2713-2717　2006/12

DOI： 10.1016/j.apsusc.2006.05.045 　

ISSN： 0169-4332
Surface-enhanced Raman spectral study of Au nano-particles/alkanethiol self-assembled monolayers/Au(111) hetero structures Peer-reviewed

T. Wadayama, M. Oishi

SURFACE SCIENCE　600　(18)　4352-4356　2006/09

DOI： 10.1016/j.susc.2006.01.163 　

ISSN： 0039-6028
Hot-electron assisted reaction of p-nitrobenzoic acid adsorbed on metal-insulator-metal tunnel junction's electrode surface Peer-reviewed

T. Wadayama, M. Yokawa

CHEMICAL PHYSICS LETTERS　428　(4-6)　348-351　2006/09

DOI： 10.1016/j.cplett.2006.07.012 　

ISSN： 0009-2614
Terahertz dichroism of MBBA liquid crystal on rubbed substrate Peer-reviewed

J Nishizawa, T Yamada, T Sasaki, T Tanabe, T Wadayama, T Tanno, K Suto

APPLIED SURFACE SCIENCE　252　(12)　4226-4229　2006/04

DOI： 10.1016/j.apsusc.2005.06.031 　

ISSN： 0169-4332

eISSN： 1873-5584
Enhanced infrared absorption of C-60 on thin evaporated Pd island films Invited Peer-reviewed

Toshimasa Wadayama, Takaaki Ohta, Aritada Hatta

ISRAEL JOURNAL OF CHEMISTRY　46　(3)　257-263　2006

ISSN： 0021-2148
Infrared reflection absorption study of carbon monoxide adsorption on Cu(100)-(2x2)p4g-Pd ordered alloy surface Peer-reviewed

T Wadayama, Y Sasaki, K Shiomitsu, A Hatta

SURFACE SCIENCE　592　(1-3)　72-82　2005/11

DOI： 10.1016/j.susc.2005.06.083 　

ISSN： 0039-6028
IR absorption enhancement for ionized p-nitrobenzoic acid on silver island films epitaxially grown on the 7x7 reconstructed Si(111) surface Peer-reviewed

T Wadayama, M Takada, A Hatta

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING　80　(3)　615-619　2005/02

DOI： 10.1007/s00339-003-2246-x 　

ISSN： 0947-8396
In situ IR and RHEED study of carbon monoxide surfactant assisted growth of fcc-Fe on Cu(100) Peer-reviewed

T Wadayama, T Yamashita, A Hatta

SURFACE SCIENCE　575　(1-2)　210-216　2005/01

DOI： 10.1016/j.susc.2004.11.025 　

ISSN： 0039-6028

eISSN： 1879-2758
Bias-voltage-induced decomposition of 2-methyl-1,4-naphthoquinone on Ag/AlOx/Al tunnel junction Peer-reviewed

T Wadayama, A Kojim, A Hatta

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING　79　(8)　1891-1894　2004/12

DOI： 10.1007/s00339-004-2986-2 　

ISSN： 0947-8396
Visible light emission from porous Si investigated with in-situ photoluminescence, Raman, and IR spectroscopies Peer-reviewed

T Wadayama, T Arigane, A Hatta

JOURNAL OF THE JAPAN INSTITUTE OF METALS　68　(10)　873-879　2004/10

ISSN： 0021-4876

eISSN： 1880-6880
In situ UV-visible and IR absorption study of the aggregation of silver colloidal particles via chemisorption of octadecanethiol Peer-reviewed

T Wadayama, H Yano, Y Sasaki, J Takahashi, A Hatta

SURFACE AND INTERFACE ANALYSIS　36　(7)　613-618　2004/07

DOI： 10.1002/sia.1785 　

ISSN： 0142-2421
The Surface of fcc-Fe Thin Films Probed by a Diatomic Molecule CO Invited

Toshimasa WADAYAMA

Materia　43　(7)　578-584　2004/07
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.43.578 　

ISSN： 1340-2625
In-situ IR and RHEED observations of fcc-Fe epitaxial growth on Cu(100) in an atmosphere of carbon monoxide Peer-reviewed

T Wadayama, T Yamashita, R Tanimura, T Sato, K Monma, A Hatta

MATERIALS TRANSACTIONS　45　(7)　2478-+　2004/07

DOI： 10.2320/matertrans.45.2478 　

ISSN： 1345-9678

eISSN： 1347-5320
Infrared absorption enhancement of C-60 by overlaying thin silver island films Peer-reviewed

T Wadayama, K Aoshima, S Kawano, A Hatta

APPLIED SPECTROSCOPY　58　(3)　299-303　2004/03

DOI： 10.1366/000370204322886645 　

ISSN： 0003-7028
Infrared absorption enhancement of octadecanethiol on colloidal silver particles Peer-reviewed

Toshimasa Wadayama, Hirochika Yano, Yusuke Sasaki, Jun-Ichi Takahashi, Aritada Hatta

Materials Transactions　45　(1)　86-91　2004
Publisher: Japan Institute of Metals (JIM)
DOI： 10.2320/matertrans.45.86 　

ISSN： 1345-9678
In-situ photoluminescence, Raman, and IR spectral study of porous silicon during exposure to thermoelectrons/H atoms, /H2O and /O-3 Peer-reviewed

T Wadayama, T Arigane, A Hatta

MATERIALS TRANSACTIONS　44　(7)　1394-1399　2003/07

DOI： 10.2320/matertrans.44.1394 　

ISSN： 1345-9678

eISSN： 1347-5320
Infrared reflection absorption study of carbon monoxide adsorbed on submonolayer Fe-covered Cu(100), (110), and (111) bimetallic surfaces Peer-reviewed

T Wadayama, K Kubo, T Yamashita, T Tanabe, A Hatta

JOURNAL OF PHYSICAL CHEMISTRY B　107　(16)　3768-3773　2003/04

DOI： 10.1021/jp026212v 　

ISSN： 1520-6106
Investigation of the adsorption and decomposition of Fe(CO)(5) on fcc and bcc iron films by infrared reflection absorption spectroscopy Peer-reviewed

T Tanabe, K Kubo, T Ishibashi, T Wadayama, A Hatta

APPLIED SURFACE SCIENCE　207　(1-4)　115-120　2003/02

DOI： 10.1016/S0169-4332(02)01309-0 　

ISSN： 0169-4332
Self-assembly and photoisomerization of azobenzenealkanethiol derivatives on gold films: Infrared reflection absorption studies Peer-reviewed

T Sato, K Tsuji, E Kokuryu, T Wadayama, A Hatta

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　391　13-39　2003

DOI： 10.1080/10587250216173 　

ISSN： 1542-1406

eISSN： 1563-5287
Infrared absorption enhancement of C60 on silver islands: Contribution of charge transfer and collective electron resonance

T. Wadayama, M. Takada, K. Sugiyama, A. Hatta

Physical Review B - Condensed Matter and Materials Physics　66　(19)　1934011-1934014　2002/11/15

ISSN： 0163-1829
Infrared absorption enhancement of C-60 on silver islands: Contribution of charge transfer and collective electron resonance Peer-reviewed

T Wadayama, M Takada, K Sugiyama, A Hatta

PHYSICAL REVIEW B　66　(19)　193401　2002/11

DOI： 10.1103/PhysRevB.66.193401 　

ISSN： 2469-9950

eISSN： 2469-9969
Unusual photoluminescence decay of porous silicon prepared by rapid thermal oxidation and quenching in liquid nitrogen Peer-reviewed

T Wadayama, T Arigane, K Hayamizu, A Hatta

MATERIALS TRANSACTIONS　43　(11)　2832-2837　2002/11

DOI： 10.2320/matertrans.43.2832 　

ISSN： 1345-9678

eISSN： 1347-5320
Carbon monoxide adsorption on 4 monolayer thick fcc-Fe/Cu(100): infrared reflection absorption and low energy electron diffraction studies Peer-reviewed

T Wadayama, K Kubo, T Yamashita, T Tanabe, A Hatta

APPLIED SURFACE SCIENCE　199　(1-4)　254-258　2002/10

DOI： 10.1016/S0169-4332(02)00847-4 　

ISSN： 0169-4332
Infrared absorption study of CO chemisorption on copper island films Peer-reviewed

H Seki, M Takada, T Tanabe, T Wadayama, A Hatta

SURFACE SCIENCE　506　(1-2)　23-32　2002/05

DOI： 10.1016/S0039-6028(02)01441-3 　

ISSN： 0039-6028
Infrared spectroscopic study of dimethylaluminum-hydride adsorption on oxidized, hydrogen-terminated, and reconstructed Si surfaces Peer-reviewed

T Wadayama, K Takeuchi, K Mukai, T Tanabe, A Hatta

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A　20　(2)　299-304　2002/03

DOI： 10.1116/1.1434966 　

ISSN： 0734-2101

eISSN： 1520-8559
Infrared absorption enhancement of (formula presented) on silver islands: Contribution of charge transfer and collective electron resonance Peer-reviewed

T. Wadayama, M. Takada, K. Sugiyama, A. Hatta

Physical Review B - Condensed Matter and Materials Physics　66　(19)　1-4　2002

DOI： 10.1103/PhysRevB.66.193401 　

ISSN： 1550-235X 1098-0121
Decomposition Behavior of Fe(CO)5 on fcc and bcc Fe films: an Infrared Reflection Absorption Study Peer-reviewed

T. Tanabe, K. Kubo, T. Ishibashi, T. Wadayama, A. Hatta

Abstracts of International Conference on Crystal Growth (ICCG)　409　2001
Carbon Monoxide Exposure to Molecular Beam Epitaxially Grown fcc-Fe Films on Cu(100): Infrared Reflection Absorption and Low Energy Electron Diffraction Study Peer-reviewed

T. Wadayama, K. Kubo, T. Ishibashi, T. Tanabe, A. Hatta

Abstracts of International Conference on Crystal Growth (ICCG)　409　2001
Infrared reflection absorption spectroscopic study for CO adsorption on molecular beam epitaxially grown Fe films on Cu(111) Peer-reviewed

T Tanabe, R Buckmaster, T Ishibashi, T Wadayama, A Hatta

SURFACE SCIENCE　472　(1-2)　1-8　2001/01

DOI： 10.1016/S0039-6028(00)00931-6 　

ISSN： 0039-6028
Infrared spectral study of CO adsorption on molecular-beam epitaxially grown, fcc iron films on Cu(100) Peer-reviewed

T Tanabe, T Shibahara, R Buckmaster, T Ishibashi, T Wadayama, A Hatta

SURFACE SCIENCE　466　(1-3)　1-10　2000/11

DOI： 10.1016/S0039-6028(00)00772-X 　

ISSN： 0039-6028
Photoluminescence from porous silicon : the contribution of surface chemical structure Invited

T.Arigane, T.Wadayama, A.Hatta

Surface　38　(7)　325-334　2000/07
Publisher:
ISSN： 0367-648X
Dynamic photoluminescence change of porous Si upon exposure to thermoelectrons/D atoms and D2O Peer-reviewed

T Wadayama, T Arigane, K Hayamizu, T Shibahara, D Hino, A Hatta

APPLIED PHYSICS LETTERS　76　(14)　1851-1853　2000/04

DOI： 10.1063/1.126189 　

ISSN： 0003-6951
Enhancement of the infrared absorption of methanol adsorbed on silver island films Peer-reviewed

Y Suzuki, H Seki, T Inamura, T Tanabe, T Wadayama, A Hatta

SURFACE SCIENCE　433　261-266　1999/08

DOI： 10.1016/S0039-6028(99)00526-9 　

ISSN： 0039-6028
IR absorption enhancement for physisorbed methanol on Ag island films deposited on the oxidized and H-terminated Si(111) surfaces: effect of the metal surface morphology Peer-reviewed

T Wadayama, O Suzuki, K Takeuchi, H Seki, T Tanabe, Y Suzuki, A Hatta

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING　69　(1)　77-80　1999/07

DOI： 10.1007/s003390050974 　

ISSN： 0947-8396
Thickness dependence of infra-red absorption enhancement for methanol on evaporated silver films Peer-reviewed

Y Suzuki, H Seki, T Inamura, T Tanabe, T Wadayama, A Hatta

SURFACE SCIENCE　427-28　136-140　1999/06

DOI： 10.1016/S0039-6028(99)00248-4 　

ISSN： 0039-6028
In situ FT-IR and photoluminescence study of porous silicon during exposure to F-2, H2O, and D2O Peer-reviewed

T Arigane, K Yoshida, T Wadayama, A Hatta

SURFACE SCIENCE　427-28　304-308　1999/06

DOI： 10.1016/S0039-6028(99)00294-0 　

ISSN： 0039-6028
Carbon monoxide adsorption on ultra-thin Fe film deposited on Cu(100) Peer-reviewed

T Tanabe, Y Suzuki, T Wadayama, A Hatta

SURFACE SCIENCE　427-28　414-418　1999/06

DOI： 10.1016/S0039-6028(99)00313-1 　

ISSN： 0039-6028
Enhancement of the photoluminescence from porous silicon by anodic polarization Peer-reviewed

T Arigane, N Watanabe, T Wadayama, A Hatta

MATERIALS TRANSACTIONS JIM　40　(3)　182-185　1999/03

DOI： 10.2320/matertrans1989.40.182 　

ISSN： 0916-1821
Thermal and UV photolytic behavior of Fe(CO)(5) on evaporated Fe films: an infrared reflection absorption study Peer-reviewed

T Tanabe, T Morisato, Y Suzuki, Y Matsumoto, T Wadayama, A Hatta

VIBRATIONAL SPECTROSCOPY　18　(2)　141-147　1998/12

DOI： 10.1016/S0924-2031(98)00057-5 　

ISSN： 0924-2031
Change in luminescence properties of porous Si by F-2 and D2O exposure: In situ photoluminescence, Raman, and Fourier-transform infrared spectral study Peer-reviewed

T Wadayama, T Arigane, A Hatta

APPLIED PHYSICS LETTERS　73　(18)　2570-2572　1998/11

DOI： 10.1063/1.122508 　

ISSN： 0003-6951
Raman spectroscopic study of iron pentacarbonyl on silver at elevated temperatures Peer-reviewed

K Yamatake, T Tanabe, Y Suzuki, Y Matsumoto, T Wadayama, A Hatta

JOURNAL OF RAMAN SPECTROSCOPY　29　(9)　781-785　1998/09

DOI： 10.1002/(SICI)1097-4555(199809)29:9<781::AID-JRS300>3.0.CO;2-1 　

ISSN： 0377-0486
Real-time photoluminescence and Raman spectral study of porous Si during F-2 and H2O exposure Peer-reviewed

T Wadayama, T Arigane, K Fujine, A Hatta

JOURNAL OF LUMINESCENCE　78　(2)　111-116　1998/03

DOI： 10.1016/S0022-2313(97)00309-8 　

ISSN： 0022-2313
Dynamic photoluminescence change of porous Si upon exposure to thermoelectrons/D atoms and D2O

Applied Physics Letters　73　(18)　2570-2572　1998
Publisher: American Institute of Physics
DOI： 10.1063/1.122508 　

ISSN： 0003-6951
Infrared absorption enhancement of p-cyanobenzoic acid on silver island films deposited on oxidized and hydrogen-terminated Si(100) surfaces Peer-reviewed

T Wadayama, O Suzuki, Y Suzuki, A Hatta

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING　64　(5)　501-506　1997/05

ISSN： 0947-8396
Photoluminescence and Raman spectral study of porous Si during F-2 exposure Peer-reviewed

T Wadayama, T Arigane, K Hujine, A Hatta

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　36　(3B)　L313-L315　1997/03

DOI： 10.1143/JJAP.36.L313 　
In situ TR spectral study of the reaction of a-Si:H:F films with dimethylaluminum hydride Peer-reviewed

T Wadayama, Y Maiwa, A Hatta

VIBRATIONAL SPECTROSCOPY　13　(1)　107-112　1996/12

DOI： 10.1016/0924-2031(96)00041-0 　

ISSN： 0924-2031
Electrobleaching of WO3 as probed by Raman scattering Peer-reviewed

T Wadayama, H Wako, A Hatta

MATERIALS TRANSACTIONS JIM　37　(9)　1486-1491　1996/09

DOI： 10.2320/matertrans1989.37.1486 　

ISSN： 0916-1821
In-situ IR and mass spectroscopic study of the Al(CH3)(2)H/a-Si:H reaction processes Peer-reviewed

T Wadayama, Y Maiwa, H Shibata, A Hatta

APPLIED SURFACE SCIENCE　100　575-578　1996/07

DOI： 10.1016/0169-4332(96)00341-8 　

ISSN： 0169-4332
赤外分光法による表面薄膜分析

和田山智正, 八田有尹

まてりあ　35　(9)　1019-1024　1996

DOI： 10.2320/materia.35.1019 　
IN-SITU IR SPECTROSCOPIC STUDY OF THE REACTION OF DIMETHYLALUMINUM HYDRIDE WITH PHOTOCHEMICALLY DEPOSITED AMORPHOUS-SILICON Peer-reviewed

T WADAYAMA, Y MAIWA, H SHIBATA, A HATTA

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　34　(6B)　L779-L781　1995/06

DOI： 10.1143/jjap.34.L779 　

ISSN： 0021-4922
Response to ââComment on âIn situ photoluminescence spectral study of porous Si in HF aqueous solutionââââ [Appl. Phys. Lett. 66, 2914 (1995)] Peer-reviewed

T. Wadayama, S. Yamamoto, A. Hatta

Applied Physics Letters　66　(21)　2913　1995/05/22

DOI： 10.1063/1.113702 　

ISSN： 1077-3118 0003-6951
ELECTROCHEMICAL REDUCTION OF CO2 ON SILVER AS PROBED BY SURFACE-ENHANCED RAMAN-SCATTERING Peer-reviewed

Y ICHINOHE, T WADAYAMA, A HATTA

JOURNAL OF RAMAN SPECTROSCOPY　26　(5)　335-340　1995/05

DOI： 10.1002/jrs.1250260503 　

ISSN： 0377-0486
REAL-TIME IR AND MASS SPECTROSCOPIC STUDY OF THE REACTION PROCESS OF WF6 AND A-SI-H-F Peer-reviewed

T WADAYAMA, H SHIBATA, T OHTANI, A HATTA

THIN SOLID FILMS　250　(1-2)　81-86　1994/10

ISSN： 0040-6090
Real-time IR and mass spectroscopic study of the reaction process of WF6 and a-Si:H:F Peer-reviewed

T. Wadayama, H. Shibata, T. Ohtani, A. Hatta

Thin Solid Films　250　(1-2)　81-86　1994/10/01

DOI： 10.1016/0040-6090(94)90169-4 　

ISSN： 0040-6090
IN-SITU PHOTOLUMINESCENCE SPECTRAL STUDY OF POROUS SI IN HF AQUEOUS-SOLUTION Peer-reviewed

T WADAYAMA, S YAMAMOTO, A HATTA

APPLIED PHYSICS LETTERS　65　(13)　1653-1655　1994/09

DOI： 10.1063/1.112945 　

ISSN： 0003-6951
DEPOSITION PROCESS OF W ONTO A-SI-H OBSERVED IN-SITU WITH POLARIZATION MODULATION IR AND QUADRUPOLE MASS SPECTROSCOPIES Peer-reviewed

T WADAYAMA, H SHIBATA, T OHTANI, A HATTA

APPLIED SURFACE SCIENCE　78　(1)　93-98　1994/05

DOI： 10.1016/0169-4332(94)90036-1 　

ISSN： 0169-4332
SI-RICH SURFACE-LAYER OF PHOTOCHEMICALLY DEPOSITED SILICON-NITRIDE Peer-reviewed

T WADAYAMA, H SHIBATA, T KOBAYASHI, A HATTA

JOURNAL OF MATERIALS SCIENCE　29　(4)　1041-1044　1994/02

DOI： 10.1007/BF00351429 　

ISSN： 0022-2461
INSITU INFRARED AND MASS SPECTROSCOPIC STUDY OF THE REACTION OF WF(6) WITH HYDROGENATED AMORPHOUS-SILICON Peer-reviewed

T WADAYAMA, H SHIBATA, T OHTANI, A HATTA

APPLIED PHYSICS LETTERS　61　(9)　1060-1062　1992/08

DOI： 10.1063/1.107716 　

ISSN： 0003-6951
薄膜気相成長過程のその場赤外分光 Invited

和田山智正

分光研究　41　(5)　301-316　1992/05
Publisher: The Spectroscopical Society of Japan
DOI： 10.5111/bunkou.41.301 　

ISSN： 0038-7002
INSITU OBSERVATION OF CHEMICAL VAPOR-DEPOSITED TITANIUM-OXIDE FILMS BY DOUBLE-MODULATION INFRARED-EMISSION SPECTROMETRY Peer-reviewed

T WADAYAMA, H MIZUSEKI, A HATTA

VIBRATIONAL SPECTROSCOPY　2　(4)　239-244　1991/12

DOI： 10.1016/0924-2031(91)85031-H 　

ISSN： 0924-2031
KRETSCHMANN ATR-IR SPECTROSCOPY OF INVESTIGATING METAL LIQUID(OR SOLID) INTERFACES Peer-reviewed

A HATTA, Y SUZUKI, T WADAYAMA, W SUETAKA

APPLIED SURFACE SCIENCE　48-9　222-226　1991/05

DOI： 10.1016/0169-4332(91)90334-G 　

ISSN： 0169-4332
INSITU IR OBSERVATION OF PHOTO-CHEMICALLY DEPOSITED SILICON-NITRIDE THIN-FILMS Peer-reviewed

T WADAYAMA, T HIHARA, A HATTA, W SUETAKA

APPLIED SURFACE SCIENCE　48-9　409-413　1991/05

DOI： 10.1016/0169-4332(91)90365-Q 　

ISSN： 0169-4332
INSITU IR SPECTROSCOPIC OBSERVATION OF A-SI-H(F) FILMS GROWING UNDER SPONTANEOUS CHEMICAL-DEPOSITION METHOD Peer-reviewed

T WADAYAMA, H KAYAMA, A HATTA, W SUETAKA, J HANNA

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　29　(10)　1884-1888　1990/10

ISSN： 0021-4922
POLARIZATION MODULATION IR SPECTROSCOPIC STUDY OF ELECTROCHEMICALLY GENERATED SPECIES FROM TCNE AT A GOLD ELECTRODE IN THE KRETSCHMANN ATR GEOMETRY Peer-reviewed

T WADAYAMA, Y MOMOTA, A HATTA, W SUETAKA

JOURNAL OF ELECTROANALYTICAL CHEMISTRY　289　(1-2)　29-36　1990/08

DOI： 10.1016/0022-0728(90)87204-W 　

ISSN： 0022-0728
A DOUBLE-MODULATION METHOD OF OBSERVING INFRARED-EMISSION SPECTRA OF THIN-FILMS ON METAL-SURFACES Peer-reviewed

T WADAYAMA, W SHIRAISHI, A HATTA, W SUETAKA

APPLIED SURFACE SCIENCE　44　(1)　43-47　1990/02

DOI： 10.1016/0169-4332(90)90073-9 　

ISSN： 0169-4332
METASTABLE SURFACE-LAYER OF A SILICON-NITRIDE THIN-FILM GROWING BY PHOTO-CHEMICAL VAPOR-DEPOSITION Peer-reviewed

T WADAYAMA, W SUETAKA

SURFACE SCIENCE　218　(2-3)　L490-L496　1989/08

DOI： 10.1016/0039-6028(89)90150-7 　

ISSN： 0039-6028
The Change in Molecular Orientation of Octadecyl-Metacrylate L-B Film in Photo-Polymerization Observed with Polarization Modulation Infrared Spectroscopy Peer-reviewed

T.Wadayama, H.Momose, W.Suetaka

Journal of the spectroscopical society of JAPAN　38　(3)　192-198　1989
Publisher: The Spectroscopical Society of Japan
DOI： 10.5111/bunkou.38.192 　

ISSN： 0038-7002

More details Close

Polarization modulation IR spectroscopy has been applied to the observation of orientation change of octadecyl-methacrylate (ODMA) molecules in L-B films in photo-polymerization. The absorption bands in the IR reflection spectra changed in intensity as well as in peak position upon UV irradiation in N₂ atmosphere. From the comparison of the observed reflection spectrum to that calculated of isotropic film, it is deduced that whereas the orientation of methacryl residue of ODMA changes upon photo-induced polymerization, the long chain of alkyl group remains nearly unchanged in orientation.
CHARGE-TRANSFER ENHANCEMENT IN INFRARED-ABSORPTION OF THIOCYANATE IONS ADSORBED ON A GOLD ELECTRODE IN THE KRETSCHMANN ATR CONFIGURATION Peer-reviewed

T WADAYAMA, T SAKURAI, S ICHIKAWA, W SUETAKA

SURFACE SCIENCE　198　(3)　L359-L364　1988/05

DOI： 10.1016/0039-6028(88)90366-4 　

ISSN： 0039-6028
INSITU IR SPECTROSCOPIC STUDY OF A-SI-H FILMS GROWING UNDER PHOTO-CHEMICAL VAPOR-DEPOSITION CONDITION Peer-reviewed

T WADAYAMA, W SUETAKA, A SEKIGUCHI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　27　(4)　501-505　1988/04

DOI： 10.1143/JJAP.27.501 　

ISSN： 0021-4922
気体/固体界面反応のその場赤外測定 Invited

和田山智正

表面　24　(11)　620-633　1986/11
Publisher:
ISSN： 0367-648X
INSITU OBSERVATION OF PT/TIO2 PHOTOCATALYST AND SURFACE INTERMEDIATE UNDER REACTION CONDITION BY POLARIZATION MODULATION INFRARED-SPECTROSCOPY Peer-reviewed

T WADAYAMA, M WADA, W SUETAKA

APPLIED SURFACE SCIENCE　25　(1-2)　231-236　1986/02

DOI： 10.1016/0169-4332(86)90041-3 　

ISSN： 0169-4332
THE ADSORPTION OF ETHYL ACETOACETATE ON NICKEL MODIFIED WITH D-ALPHA-ALANINE STUDIED BY POLARIZATION MODULATION IR SPECTROSCOPY Peer-reviewed

A HATTA, T KOBAYASHI, T WADAYAMA, W SUETAKA

CHEMISTRY LETTERS　(6)　843-846　1985

DOI： 10.1246/cl.1985.843 　

ISSN： 0366-7022

eISSN： 1348-0715
A Polarization Modulation Infrared Reflection Technique Applied to Study of Thin Films on Metal and Semiconductor Surfaces Peer-reviewed

Aritada Hatta, Toshimasa Wadayama, Wataru SuKtaka

Analytical Sciences　1　(5)　403-408　1985

DOI： 10.2116/analsci.1.403 　

ISSN： 1348-2246 0910-6340
BEHAVIOR OF CHEMICAL-SPECIES IN GAS METAL INTERFACE OBSERVED INSITU WITH POLARIZATION MODULATION INFRARED-ABSORPTION AND EMISSION SPECTROSCOPIES Peer-reviewed

T WADAYAMA, Y HANATA, W SUETAKA

SURFACE SCIENCE　158　(1-3)　579-595　1985

DOI： 10.1016/0039-6028(85)90331-0 　

ISSN： 0039-6028
METASTABLE SURFACE SPECIES ON MOO3 OBSERVED IN METHANOL VAPOR AT AN ELEVATED-TEMPERATURE WITH POLARIZATION MODULATION INFRARED-SPECTROSCOPY Peer-reviewed

T WADAYAMA, T SAITO, W SUETAKA

APPLICATIONS OF SURFACE SCIENCE　20　(1-2)　199-201　1984

DOI： 10.1016/0378-5963(84)90340-4 　

ISSN： 0378-5963
MULTIPLE ADSORBATES ON COPPER SURFACES IN FORMIC-ACID VAPOR OBSERVED BY POLARIZATION MODULATION INFRARED SPECTROCOPY Peer-reviewed

T WADAYAMA, K MONMA, W SUETAKA

JOURNAL OF PHYSICAL CHEMISTRY　87　(17)　3181-3183　1983

DOI： 10.1021/j100240a003 　

ISSN： 0022-3654

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Misc. 15

アークプラズム法でHOPG上に作成したPtAuナノ粒子の異常なAu-Au結合短縮について

朝倉清高, HU Bing, 轟直人, 和田山智正, 東晃太朗, 宇留賀朋哉, 宇留賀朋哉, 岩澤康裕, 三輪(有賀)寛子, 高草木達

触媒討論会講演予稿集(CD-ROM)　129th　2022

ISSN： 2187-5928
東北大学環境材料表面科学研究室－電極触媒モデルのドライプロセス合成と評価－ Invited

轟直人, 和田山智正

燃料電池　18　82-86　2019/02
Pt-Co合金ナノ粒子の酸素還元反応耐久性に対する表面Au修飾の影響

長尾哲郎, 高橋俊太郎, FEITEN Felix, 脇坂祐輝, 轟直人, 妙智力也, 関澤央輝, 坂田智裕, 東晃太朗, 宇留賀朋哉, 岩澤康裕, 朝倉清高, 和田山智正

電気化学会大会講演要旨集(CD-ROM)　85th　2018
表面Au修飾PtCo合金ナノ粒子の酸素還元反応活性と電気化学的安定性

長尾哲郎, 高橋俊太郎, FEITEN Felix, 脇坂祐輝, 轟直人, 妙智力也, 関澤央輝, 坂田智裕, 東晃太朗, 宇留賀朋哉, 岩澤康裕, 朝倉清高, 和田山智正

日本金属学会講演概要(CD-ROM)　163rd　2018

ISSN： 2433-3093
光電子・共鳴Auger電子回折によるPt/Ni/Pt(111)表面の原子構造解析

太田紘志, 轟直人, 和田山智正, 松井文彦

日本物理学会講演概要集(CD-ROM)　72　(1)　2017

ISSN： 2189-079X
Oxygen Reduction Reaction Activity for Pt-based Alloy Model Single Crystal Catalysts Prepared in Ultra-high Vacuum

N.Todoroki, T.Wadayama

Electrochemistry　83　(2)　101-105　2015/02
Publisher: The Electrochemical Society of Japan
DOI： 10.5796/electrochemistry.83.101 　

ISSN： 1344-3542
Oxygen reduction reaction activity for platinum-based bimetallic single crystal surfaces prepared by molecular beam epitaxy[p]

Toshimasa Wadayama

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　243　2012/03

ISSN： 0065-7727
二原子分子COをプローブとして見たfcc-Fe薄膜表面

和田山智正

まてりあ　43　(7)　578-584　2004/07
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.43.578 　

ISSN： 1340-2625
Self-assembly and photoisomerization of azobenzenealkanethiol derivatives on gold films: Infrared reflection absorption studies

T. Sato, K. Tsuji, E. Kokuryu, T. Wadayama, A. Hatta

Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals　391　13-39　2002

DOI： 10.1080/10587250216173 　

ISSN： 1058-725X
多孔質シリコンのフォトルミネセンス：表面化学構造の寄与

有金剛, 和田山智正, 八田有尹

表面　38　(7)　325-334　2000/07
Publisher: 広信社
ISSN： 0367-648X
赤外分光法による表面薄膜分析

和田山智正, 八田有尹

まてりあ　35　(9)　1019-1024　1996/09

DOI： 10.2320/materia.35.1019 　
IN-SITU PHOTOLUMINESCENCE SPECTRAL STUDY OF POROUS SI IN HF AQUEOUS-SOLUTION - RESPONSE

T WADAYAMA, S YAMAMOTO, A HATTA

APPLIED PHYSICS LETTERS　66　(21)　2913-2913　1995/05

ISSN： 0003-6951
薄膜気相成長過程のその場赤外分光

和田山智正

分光研究　41　(5)　301-316　1992/05

DOI： 10.5111/bunkou.41.301 　
INSITU IR SPECTROSCOPIC STUDY OF A-SI-H THIN-FILMS UNDER PHOTOCHEMICAL VAPOR-DEPOSITION CONDITIONS

T WADAYAMA, W SUETAKA

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　134　(8B)　C444-C444　1987/08

ISSN： 0013-4651
気体・固体界面のその場赤外測定

和田山智正

表面　24　(11)　620-633　1986/11

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Books and Other Publications 5

化学便覧応用化学編第7版

和田山智正

丸善　2014/01
化学便覧応用化学編第６版

T.WADAYAMA

2003/03
Recent Research Developments in Applied Physics, vol.2

T.Wadayama

1999
材料工学の先端実験技術

和田山智正, 八田有尹

1999
実験材料科学ニュ-マテリアル開発への基礎

和田山智正

1996/09

Presentations 50

アークプラズマ堆積したPt/Coナノ構造の酸素還元反応特性

妙智力也, 金子聡真, 高橋俊太郎, 田邉匡生, 轟直人, 和田山智正

日本金属学会2017年秋期講演大会　2017/09/06
窒素イオンビーム照射Pt-Ni(111)表面合金系の酸素還元反応特性

渡邉将, 浅野真仁, 笹川簾, 轟直人, 和田山智正

日本金属学会2017年秋期講演大会　2017/09/06
アークプラズマ蒸着法により合成したPt基合金ナノ粒子の燃料電池電極触媒特性

日本金属学会2017年秋期講演大会　2017/09/06
よく規定されたAu表面における二酸化炭素電解還元過程のオンライン電気化学質量分析

鶴巻碩人, 程宏輝, 轟直人, 和田山智正

日本金属学会2017年秋期講演大会　2017/09/06
Oxygen Reduction Reaction Activity for Vacuum-Deposited Pt-Monolayers on Metal Single Crystal Substrates International-presentation

N. Todoroki, H. Watanabe, S. Kaneko, M. Hosoda, Y. Bando, S. Takahashi, T. Wadayama

68th ISE Annual Meeting　2017/08/27
Oxygen Reduction Reaction Activity for Strain-controlled Pt/Co Multilayered Model Catalyst Surface International-presentation

S. Kaneko, R. Myochi, S. Takahashi, N. Todoroki, T. Wadayama, T. Tanabe

ECHEM2017　2017/06/06
Pt(111)上に作製したPt/Co交互堆積膜の酸素還元反応活性

金子聡真, 妙智力也, 高橋俊太郎, 轟直人, 和田山智正

第84回電気化学会　2017/03/25
窒化表面処理Pt-Ni合金単結晶基板上に形成したPtシェルの構造と酸素還元反応活性

笹川廉, 浅野真仁, 渡邉将, 川村隆太郎, 轟直人, 和田山智正

第84回電気化学会　2017/03/25
Au(hkl)表面におけるCO2電解還元反応生成物のオンライン電気化学質量分析

程宏輝, 鶴巻碩人, 井上達彦, 轟直人, 和田山智正

第84回電気化学会　2017/03/25
アークプラズマ合成したAu修飾Pt-Co合金ナノ粒子の酸素還元反応特性

高橋俊太郎, 千葉洋, 高橋直己, 川口浩太郎, 轟直人, 和田山智正

第84回電気化学会　2017/03/25
貴金属単結晶基板上に形成したPt単原子層表面の酸素還元反応活性

轟直人, 渡邊裕文, 金子聡真, 細田雅嗣, 番土陽平, 和田山智正

第84回電気化学会　2017/03/25
Pt基合金ナノ微粒子の構造と酸素還元反応特性における窒化処理の影響

高橋俊太郎, 川口浩太郎, 轟直人, 和田山智正

第57回電池討論会　2016/11/29
窒素ビーム照射Pt25Ni75(111)上に堆積したPtシェル層の酸素還元反応特性

浅野真仁, 渡邉将, 川村隆太郎, 轟直人, 和田山智正

第57回電池討論会　2016/11/29
80℃電位サイクル負荷環境におけるPt/M(111)モデルコア－シェル計の酸素還元反応活性

轟直人, 谷佑樹, 渡邊裕文, 金子聡真, 和田山智正

第57回電池討論会　2016/11/29
Pt/Ir(111), (100)表面の酸素還元反応活性および耐久性

渡邊裕文, 金子聡真, 細田雅嗣, 轟直人, 和田山智正

第57回電池討論会　2016/11/29
Pt-Ni(111)合金単結晶表面の電気化学STM観察

笹川廉, 浅野真仁, 川村隆太郎, 轟直人, 和田山智正

第９回新電極触媒シンポジウム　2016/10/21
Pt/Ir(111)酸素還元活性の電位サイクル負荷依存性

渡邊裕文, 金子聡真, 細田雅嗣, 轟直人, 和田山智正

第９回新電極触媒シンポジウム　2016/10/21
On-Line Mass Spectrometry for Ethanol Oxidation on Well-Defined Sn/Pt(hkl) Electrode Surfaces International-presentation

H. Nakamura, T. Inoue, T. Matsuda, N. Todoroki, T. Wadayama

PRiME2016　2016/10/02
Oxygen Reduction Reaction Activity and Durability for Pt/TaNx Model Catalysts Fabricated in Ultra-High-Vacuum International-presentation

S. Takahashi, N. Takahashi, N. Todoroki, T. Wadayama

PRiME2016　2016/10/02
Oxygen Reduction Reaction Activity and Durability for Model Pt Shell Layers on Ir(111) Prepared by Molecular Beam Epitaxy International-presentation

H. Watanabe, S. Kaneko, N. Todoroki, T. Wadayama

PRiME2016　2016/10/02
ORR Properties for Model Pt-Shell Layers Prepared on Nitrogen-Beam Irradiated Pt25Ni75(111) Substrate International-presentation

M. Asano, R. Kawamura, N. Todoroki, T. Wadayama

PRiME2016　2016/10/02
Surface Structures and Electrochemical Stabilities for Pt/Pd(111) Model Electrocatalysts International-presentation

N. Todoroki, Y. Bando, Y. Tani, S. Kaneko, H. Watanabe, T. Wadayama

PRiME2016　2016/10/02
Pt単原子層被覆M(111)(M=Pd, Ir, Au)モデルコアシェル単結晶表面合金の電極触媒特性

金子聡真, 渡邊裕文, 近土昴之, 番土陽平, 轟直人, 和田山智正

日本金属学会 2016年秋期講演大会　2016/09/21
メチルシクロヘキサンの熱的脱水素反応で用いる蒸着Pt-Co合金触媒の活性な表面組成探索

程宏輝, 中村大樹, 轟直人, 和田山智正

日本金属学会 2016年秋期講演大会　2016/09/21
Ptシェル/Pt25Ni75(111)合金のORR触媒活性と強酸性溶液中最表面構造

笹川廉, 浅野真仁, 川村隆太郎, 轟直人, 和田山智正

日本金属学会 2016年秋期講演大会　2016/09/21
二次元光電子回折法によるNi/Pt(111)モデル触媒表面の原子配列解析

轟直人, 松井文彦, 太田紘志, 和田山智正

3D活性サイト科学第四回成果報告会　2016/09/10
Surface structures and electrocatalytic properties for well-defined Pt/Pd(111) surfaces International-presentation

N. Todoroki, Y. Bando, Y. Tani, H, Watanabe, T. Wadayama

IVC-20　2016/08/21
ORR Activity and Durability for Pt(111) Epitaxial Layers Prepared on PtxNi1-x(111) Single Crystal Alloy Substrates International-presentation

T. Wadayama, R. Kawamura, M. Asano, R, Sasakawa, N. Todoroki

ISE 67th Annual Meeting　2016/08/21
Oxygen reduction reaction activities and electrochemical stabilities for Pt/PtxNi1-x(111) model catalyst surface International-presentation

R. Kawamura, M. Asano, R, Sasakawa, N. Todoroki, T. Wadayama

EVC-14　2016/07/06
Ir(111)上に構築したPtシェル表面の酸素還元反応活性

渡邊裕文, 金子聡真, 轟直人, 和田山智正

第83回電気化学会　2016/03/29
Sn/Pt(hkl)電極表面におけるエタノール酸化反応のオンライン質量分析

中村大樹, 井上達彦, 松田哲彦, 轟直人, 和田山智正

第83回電気化学会　2016/03/29
窒素ビーム照射単結晶基板上に形成したPtシェルの電極触媒特性

浅野真仁, 川村隆太郎, 轟直人, 和田山智正

第83回電気化学会　2016/03/29
N2雰囲気下でドライプロセス合成したPt-Co合金ナノ微粒子の電気化学特性

高橋俊太郎, 高橋直己, 轟直人, 和田山智正

第83回電気化学会　2016/03/29
Pt/Pd(111)モデル触媒の最表面構造と電気化学的安定性

轟直人, 番土陽平, 谷佑樹, 渡邊裕文, 金子聡真, 和田山智正

第83回電気化学会　2016/03/29
光電子ホログラフィー法による白金基合金触媒の酸素還元反応を活性化する構成元素原子配列の解明

轟直人, 浅野真仁, 高橋俊太郎, 和田山智正

3D活性サイト科学第三回成果報告会　2016/03/07
Oxygen reduction reaction activity and durability of well-defined Pt–M(111) single crystal surfaces International-presentation

R.Kawamura, M.Asano, Y.Bando, H.Watanabe, S.Takahashi, N.Todoroki, T.Wadayama

環太平洋化学会議2015　2015/12/15
Electrochemical properties for UHV-prepared Pt/M well-defined single crystal surfaces International-presentation

N. Todoroki, Y. Iijima, Y. Takahashi, T. Kondo, Y. Asakimori, Y. Bando, T. Wadayama

14th Polymer Electrolyte Fuel Cell Symposium (PEFC 14) at the 226th Electrochemical Society Meeting　2014/10/05
UHV構築合金モデル電極の酸素還元反応活性

燃料電池研究会第123回セミナー　2014/05/19
UHVで作製した薄膜モデル触媒の物性と評価

触媒学会新電極シンポジウム　2013/11/11
MBE法により作製したPt基合金表面系の酸素還元反応活性

電気化学会第80回大会　2013/03/19
Oxygen Reduction Reaction Activity and Stability for Platinum-enriched Ni/Pt(111) Bimetallic Surfaces Prepared by Molecular Beam Epitaxy International-presentation

International Conference on Emerging Advanced Nanomaterials　2012/10/21
Electrochemical Properties for MBE-prepared Pt/Au(111) Single Crystal Surfaces International-presentation

63rd Annual Meeting of the International Society of Electrochemistry　2012/08/19
Oxygen reduction reaction activity for platinum-based bimetallic single crystal surfaces prepared by molecular beam epitaxy International-presentation

243rd American Chemical Society National Meeting　2012/03
Oxygen Reduction Reaction Activity and Stability for Well-defined Pt-based Alloy Model Catalysts Prepared by Molecular Beam Epitaxy International-presentation

2011 Low carbon earth summit　2011/10
Oxygen Reduction Reaction Activities of Pt-based Surface Alloys Fabricated by Molecular Beam Epitaxy International-presentation

NIMS International Symposium on Photocatalysis and Environmental Remediation Materials 2011　2011/01/17
Pt 基合金モデル触媒のMBE 構築と酸素還元反応活性

第9回燃料電池基盤技術研究懇話会　2010/09/06
表面合金系のMBE 構築と電極触媒特性

平成22年度表面技術協会東北支部講演会　2010/07/16
格子欠陥制御工学III

日本金属学会春季大会 2008　2008/03/26
fcc-Feの表面化学特性

日本金属学会秋季大会 (1999)　1999/10
In-situ IR Spectroscopic Study of the Chemical Process of Si-related CVD Thin Films International-presentation

45th International Symposium of American Vacuum Society　1998/11/02

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Industrial Property Rights 2

オゾン発生用電極

坂田良真, 和田山智正, 轟直人, 石亀弘基, 松本聡

Property Type: Patent
ナノ粒子およびナノ粒子の製造方法

高橋俊太郎, 轟直人, 和田山智正

Property Type: Patent

Research Projects 26

Pt基モデル電極触媒表面系の構築と分子挙動 Competitive

System: The Other Research Programs

2004/04 - Present
Pt基電極触媒モデルの実験的構築と表面分子挙動観察

和田山智正

Offer Organization: NEDO

System: 固体高分子形燃料電池実用化戦略的技術開発/次世代技術開発

Institution: 東北大学

2007/10 - 2100/02
燃料電池の高性能・長寿命化に向けたイリジウム合金アノードの表面設計と反応解析

和田山智正

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2021/04/01 - 2025/03/31

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本研究では、固体高分子形燃料電池(PEFC)のアノードで進行する水素酸化反応（HOR）や過酸化水素(H2O2)の生成メカニズムを、構造の規定されたIr系合金単結晶表面を超高真空中で物理構築・モデル触媒化して検討する。その上で、アノード触媒開発に不可欠な表面構造を現状用いられているPtやPt基合金表面系を含めて原子レベルで明確にする。この課題解決に向けて、我々がこれまで培ってきた世界的にも唯一無二の超高真空中における良く規定された金属・合金表面系の物理構築技術を最大化して取り組む。 R3年度に得られた純Ir単結晶の基本低指数面（111),(110),(100)が発現するHOR活性とH2O2生成特性に関する評価結果に基づいて、R4年度にはIr(111)単結晶基板表面上に、Ruを基板温度を制御して真空堆積して作製したIr-Ru(111)モデル触媒表面系を構築し、アノード触媒特性を検討した。まず、低速イオン散乱分光法を用いて試料最表面のRu / Ir原子組成比を求めたところ、組成比は試料作製時の熱処理温度（基板温度）に敏感であり、それぞれRu：Ir＝1:1 (673 K), 1:2 (773 K), 1:4 (873 K)であることがわかった。その上でHOR活性を評価検討したところ、HORは最表面のIr2 や Ir3アンサンブルサイトが担うことがわかった。一方H2O2生成特性を評価すると、Ru単結晶(0001)面では活発に生成するのに対して、Ir-Ru(111)ではSECMの検出限界以下であり、最表面IrサイトがH2O2生成抑制に寄与することが明らかとなった。R5年度には、Pt表面に対してWO3を表面に助触媒として添加することによりH2O2生成が抑制されることが明らかとなり、その機構を検討した。また、多結晶電極における表面結晶粒ごとの触媒特性の検討にも着手した。
燃料電池の高性能・長寿命化に向けたイリジウム合金アノードの表面設計と反応解析

Offer Organization: 日本学術振興会

System: 科学研究費補助金

Category: 基盤研究(B)

Institution: 東北大学

2021/04 - 2025/03
垂直磁気異方性を付与したＰｔ単結晶表面における常磁性酸素の触媒反応

Offer Organization: 日本学術振興会

System: 科研費

Category: 挑戦的研究（萌芽）

Institution: 東北大学大学院環境科学研究科

2021/07 - 2023/03
酸化物および硫化物ミクロ構造制御による高温対応モデル触媒開発

和田山智正

Offer Organization: NEDO

System: 燃料電池等利用の飛躍的拡大に向けた共通課題解決型産学官連携研究開発事業／共通課題解決型基盤技術開発／高温低加湿作動を目指した革新的低白金化技術開発

Institution: 東北大学

2020/07 -
相互拡散バリアとなる中間層の開発

和田山智正

Offer Organization: NEDO

System: 固体高分子形燃料電池利用高度化技術開発事業/普及拡大化基盤技術開発/先進低白金化技術開発

Institution: 東北大学

2015/06 - 2019/02
Fabrication of different-metal-frame-terminated metal nano-particles

WADAYAMA TOSHIMASA, TAKAHASHI SHUNTARO

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2016/04/01 - 2018/03/31

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Pt-Au alloy and Pt-shell Au-core core-shell nanoparticles (NPs) show superior durability as the oxygen reduction reaction (ORR) catalysts for polymer electrolyte fuel cell (PEFC). However, the relation between surface atomic ratio and structural stability of the Pt-Au NPs under applying electrochemical potential cycling (PC) has yet to be further elucidated. In this study, Pt-Au NPs are synthesized by using arc-plasma deposition (APD) method onto highly-oriented pyrolytic graphite (HOPG) substrate in ultra-high vacuum. Then, ORR activities and electrochemical structural stabilities of the APD Pt-Au NPs are discussed.
Dry-process, labo-level fabrication of de-hydrogenated catalysts based on surface nano-structure control

WADAYAMA TOSHIMASA, TODOROKI NAOTO

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2014/04/01 - 2018/03/31

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Molecular behaviors of several molecules, e.g., energy carrier molecules, organic hydrides, alcohol, carbon dioxide on electrode surfaces are important subjects for future energy systems and, therefore, developments of effective electro-catalysts with suitable surface atomic arrangements and compositions are required. In this study, well-defined model catalysts (X/M(hkl)) are fabricated through molecular beam epitaxy (MBE) of alloying elements X on the low-index single crystal surfaces of Pt and Au (M(hkl); M=Pt, Au)). Then, surface structural analysis, electrochemical measurements are performed for the prepared X/M(hkl) model catalysts and discussed the relation between surface atomic arrangements, alloy compositions and catalytic properties.
Pt基合金の最表面構造最適化に基づくモデルコアシェル触媒開発

和田山智正

Offer Organization: NEDO

System: 固体高分子形燃料電池実用化推進技術開発」「基盤技術開発」「ｃ低白金化技術」

Institution: 東北大学

2010/06 - 2015/02
Surface design of non-Platinum based alloys for fuel cell electrode and improvements of catalytic performance

WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

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Atomic design of alloy's outermost surfaces is a key to achieve high activity and stability of cathode electrode catalysts for oxygen reduction reaction in fuel cells. Therefore, precise control of atomic arrangements of electrode material surfaces is indispensable. In this study, we fabricate well-defined surface alloys by using molecular beam epitaxy (MBE) through Pt- and Ni-depositions, respectively, onto Au and Pd single-crystal substrates and evaluate electrochemical properties, particularly oxygen reduction reaction activities, of the model catalysts.
Fabrication of novel electronic-catalysts by using MIM tunnel junction

WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2010 - 2011

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Precise and tunable control in electronic states of the metal surface should be directly linked to a novel catalytic reaction. Metal-insulator-metal (MIM)tunnel junction, which generates monochromatic hot-electrons under bias-voltage, would be one of the suitable devices for the hot-electron generation. The aim of this study is to clarify the tunnel junction surface works as a promoter of the surface reaction of the adsorbed molecules. We investigate the hot-electron-induced surface reaction of p-and o-nitrobenzoic acid (PNBA, ONBA)on the Ag(Au)top electrode of the Ag(Au)/AlOx/Al tunnel junction by using surface enhanced Raman scattering (SERS). The results show that the hot-electron generated under positive-bias voltage can induce reductive coupling reaction of the adsorbed molecules to generate azodibenzoate at the top electrode surface through surface plasmon polariton (SPP)resonance.
Fabrication of Pt-based model catalyst surface and chemical reaction for hydrogen cycle process

WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2006 - 2008
Surface Terahertz Spectroscopy Competitive

System: Ordinary Research

2004/04 -
Study on the monolayer arrangement and optical properties of single-dispersed metallic particles on solid surfaces

HATTA Aritada, WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2003 - 2004

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1.Infrared absorption spectral measurements have been performed at normal incidence of radiation on octadecanethiol (ODT) deposited from ethanol-water mixed solutions onto colloidal silver particles (ca. 30 nm in diameter) on Si(111) substrates. The spectra taken as a function of silver mass thickness and ODT concentration. indicate that the absorption bands of ODT are enhanced in intensity in comparison to the case in which no silver particles are present. It is also found that regardless of ODT concentration each absorption band reaches a maximum in intensity at a particular mass thickness of the particles, suggesting an intimate relationship between the absorption enhancement and the aggregation of the particles. This indeed was supported by FE-SEM morphological inspection of the particles. 2.Aggregation of silver colloidal particles in the hydrosol through chemisorption of ODT molecules has been investigated on the basis of UV-visible transmission and infrared attenuated total reflection (ATR) experiments. As-prepared silver sol showed a single absorption peak centered at 395 nm due to plasma resonance of the particles. Upon addition of ODT-dissolved ethanol to the sol, the plasma resonance peak showed a redshift accompanying a broadening, an indication of the aggregation of the particles in the solution by ODT adsorption. By use of infrared ATR spectroscopy, it was found that the particles in the solution aggregate on the base plane of a germanium ATR prism upon addition of ODT-dissolved ethanol to the solution. At moderate ODT concentrations, intense aggregation via ODT adsorption takes place on the prism surface, thus making it possible to observe ODT absorption bands. 3.Raman scattering from the adsorbed species on the colloidal particles after dropping on Si substrates has been taken using a He-Ne laser (632.8 nm) in order to more clarify the influence of ionic species produced during preparation of the colloidal silver sol upon aggregation of the particles after dropping the particles on the silicon substrate. A Raman band due to nitrate ion was observed. This band almost disappeared by immersing the deposited silicon substrate into pure water far 1 hour. However ; the nitrate band was observed more strongly after immersion of the substrate into the water for 5 hours. This increase of Raman scattering intensity can be explained by assuming that the environmental nitrate ions were diluted or adsorbed nitrate ions were desorbed more or less by the water and thereby aggregation of the silver colloid particles proceeded, leading to an increase of the so-called SERS active sites. Actually, no Raman bands due to ODT could be observed when the deposited silicon substrate was subsequently immersed into ODT-dissolved ethanol This maybe explained by assuming that the SERS active sites were occupied by nitrate ions.
Bio-material pinning to the substrate and its evaluation

WADAYAMA Toshimasa, HATTA Aritada

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2002 - 2004

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In this study, we aimed to establish a new method for pinning of sample molecules to the substrate surface and to detect faint signals due to the mono-layer sample with surface-enhanced vibrational spectroscopies. The results obtained are summarized as follows. 1.Multiple IR ATR (attenuated total reflection) measurements indicate that hydrogen bond between the substrate"poly-vinyl alcohol (PVA)"and sample"adenosine"molecules. We have attempted to pinning adenosine molecules to the PVA thin film surface formed on the Si substrate by using a brass-made"transfer roller". Surface enhanced Raman spectral (SERS) study indicates that adenosine molecules can be pinned from the transfer roller onto the PVA surface through the hydrogen bond. The optimum condition for the pinning molecules to the substrate is yet to be elucidated. 2.We have proposed another method for pinning of sample molecules, namely"pressure-attachment"(PA) method. In the PA method, Ag island films (5nm in thickness) are evaporated on glass plate and powder of the sample molecule is dispersed onto the Ag island films with spatula. After air-blowing excess powder, we applied pressure on the glass plate covered the molecule-dispersed Ag island films. Para-nitro benzoic acid (PNBA) was adsorbed on the Ag islands film surface through ionization and the SERS signals of ionized PNBA increased in intensity from the applying pressure of 0 to 0.6 MPa In contrast, the SERS signals due to adenosine adsorbed on the Ag islands surface remained nearly unchanged during applying pressure. The results obtained suggest that pinning of molecules by the PA method depends upon the affinity between the molecule and the substrate surface.
Behavior of hot-electron at MIM tunnel junction/porous Si interface

HATTA Aritada, WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2000 - 2002

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When a sufficiently strong voltage but not beyond the metal work function is applied across an Al/AlO_x/Ag junction, the so-called "hot-electron" whose energy is higher than the Fermi level can be generated. In this study, we aimed to establish the method of fabrication of Al/AlO_x/Ag junctions and to obtain basic knowledge concerning the behavior of hot electrons at the interface between the tunnel junction and the porous-Si substrate through measurements of the I-V curve. Further, the change in chemical species on Ag electrode surface during a bias voltage was applied across the junction was investigated with IR reflection absorption spectroscopy. The results obtained are summarized as follows. (1)A matter of the utmost importance in preparation of the Al/AlO_x/Ag tunnel junction is to establish the oxidation conditions of Al thin film electrode. The oxidation of the Al electrode at 280℃, 2 hours in oxygen (1 atm) atmosphere, or at 450℃, several minutes in air was suitable to obtain the junction. (2)Under irradiation of 441.6nm He-Cd laser (80mW), a remarkable increase in the tunnel current was observed for the junction formed on porous-Si substrate, whereas the junction formed on glass substrate showed no change in the tunnel current even though the same irradiation conditions were employed. The band-gap of the porous-Si used in the present study was about 1.6 eV and hence the photo-voltage generated at the porous-Is might influence the tunneling properties of the junction through the change in charge distribution between the Al electrode and the porous-Si substrate. (3)The decomposition of a 2Methyl-1, 4Naphtoquinone thin film formed on the junction was promoted when applying the bias voltage (+) to the Al electrode.
γ-Fe single crystal thin film growing process at room temperature and its surface chemistry

WADAYAMA Toshimasa, HATTA Aritada

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1999 - 2001

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Hetero-structures of ultra-thin films formed by molecular beam epitaxy (MBE) have been widely investigated since such man-made systems are one candidate for innovating heterogeneous catalysis and microelectronics fabrication processes. It is well known that bulk Fe has a body-centered-cubic (bcc) structure below 1183 K. In contrast, face-centered-cubic (fcc) Fe thin films can be obtained on single crystal Cu (fcc) substrates by MBE even at room temperature. In situ survey of atomic or molecular behavior of such species on fcc-Fe film is quite interesting for its surface chemistry aspects. We have investigated in this research project that adsorption and desorption behavior of carbon monoxide (CO) on the various thick fcc-Fe films on Cu(100) and Cu(111) using IR reflection absorption spectroscopy (IRRAS). It was shown that, on the Cu(100) substrate, CO molecules initially adsorbed on bridge sites and adsorbed on on-top sites with increasing coverage. For saturated adsorption of CO, the position and width of the on-top C-O stretch band were found to change with deposited Fe thickness and in turn the surface structures. The on-top CO species at the fcc Fe(100) surface is sharp and located at 2038 cm^<-1> at saturated coverage. At the thickness above 10 ML the band is broadened by the phase transition from fcc to bcc. It was also found that CO adsorption on the 1-3 ML films gave an additional band at 2104 cm^<-1> which is remarkably higher than the C-O stretch band of CO adsorbed on the clean Cu(100) surface, representative of the influence of Fe. For fcc Fe films of 1-4 ML on the Cu(111) substrate, where RHEED images suggest fcc Fe(111) surface the saturated CO stretch band at 90K was centered at 2000 cm^<-1>. Between 4 and 8 ML the two absorption (2032 and 2000 cm^<-1>) bands due to adsorbed CO were observed; RHEED images in this region clearly show the mixed phase of fcc (111) and bcc (110) surfaces. Above 8 ML at which the film surface transformed to the bcc structure, the band was located only at 2032 cm^<-1>.
ホットエレクトロンケミストリーに関する研究 Competitive

1998/07 -
Study on molecular adsorption in single crystal metal and semiconductor surfaces. Competitive

System: Grant-in-Aid for Scientific Research

1998/04 -
Study on the alignment control of liquid crystalline molecules by photoisomerization reaction

HATTA Aritada, SUZUKI Yushi, WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: TOHOKU UNIVERSITY

1996 - 1998

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The photoisomerization of self-assembled monolayer films of 4-(4'-(methoxyphenylazo)phenoxy)undecane- 1-thiol (AZO 11) on evaporated gold films was investigated by means of Raman scattering and UV-visible and IR absorption measurements. The trans * cis photoisomerization of the self-assembled AZO11 molecules were restricted in comparison to the isomerization of AZO11 in solutions. Moreover, the trans-to-cis isomerization was more suppressed than the cis-to-trans isomerization, as expected from the molecular cross section of cis AZO11 that is larger than trans AZO11. On this basis we propose that cis-form samples are on the whole more suitable for cis trans photoisomerization in order to control the molecular alignment of liquid crystals. This indeed was verified in our experiments where thin films of a nematic liquid crystal (4-cyano-4'-pentylbiphenyl : 5CB) were deposited on the cis and trans AZO11 surface layers. IR reflection absorption spectroscopy revealed that 5CB molecules tend to align with their long axes perpendicular to the plane of the trans AZO11 layer. However, this alignment was affected by UV irradiation due to partial conversion to cis isomer. This fact demonstrates that liquid crystal alignment can be controlled by changes in the molecular shape on the substrate surface. Similar IR measurements were performed on gold film surfaces covered with a mixture of adsorbed AZO11 and hexadecanethiol (C_<16>H_<33>SH). in this case the limitation of AZO11 photoisomerization was relaxed and a larger change in the liquid crystal alignment was observed. The utility of IR transmission and Raman scattering measurements on silver island films was also demonstrated.
Study of visible luminescence features of porous Si

WADAYAMA Toshimasa, HATTA Aritada

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

1995 - 1996

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Canham first reported a room-temperature visible photoluminescence (PL) from the porous silicon (PS) and since then a large number of investigations have been carried out on the mechanisms responsible for the visible PL as well as on its application to optoelectronic devices. The visible PL from PS samples has been explained, to date, on the basis of quantum confinement effects in Si nanostructures formed PS layrs or the formation of wide-gap surface chemical species such as siloxene. Further experimental as well as theoretical work should be needed for more precise discussion of the strong visible PL mechanisms. Most of the PL spectra reported were measured in air after the treatments and dynamic changes in the PL spectra of PS in the process of various treatments are yet to be elucidated. In situ PL analysis of the samples under the various treatments conditions would, thus, provide us an important clue to understand the mechanisms of the visible PL of PS. In the present study, visible luminescence and Raman spectral changes of porous Si during several treatments were recorded in-situ. An exposure to F_2 under Ar^+ laser light (488 nm) irradiation at 373 K leads to change in photoluminescence (PL) band intensity as well as its peak position. At early stage of the exposure, the PL band at 750 nm peak decreased in intensity and a new band emerged at 600 nm. After 30 min from the beginning of the exposure dominates the spectrum while the band at 750 nm almost disappeared. When the sample after the F_2 treatment was exposed to H_2O vapor, the PL intensity around 750 nm increased. The average particle size of the porous Si during the F_2 exposure evaluated from Raman measurements was remained unchanged during the treatments. Further, PL band intensity change of the sample during electrochemical treatments was recorded. The results showed that the PL intensity depended strongly upon the electrolytes. These results suggest that surface chemical structure of the sample species strongly influence the observed PL spectral features.
SURFACE PLASMON POLARITON-AIDED RAMAN SPECTROSCOPIC STUDY ON FILM GROWTH MECHANISMS

HATTA Aritada, SUZUKI Yushi, WADAYAMA Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for General Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1993 - 1995

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1) In order to investigate the adsorption of p-aminothiophenol (PATP) on silver, Raman scattering experiments were performed by exciting surface plasmon polaritons on Ag island films. The silver films were prepared by vacuum evaporation as a mass thickness of 5nm on BaF_2 plates. The plates were dipped into ethanol solutions containing 1 mM PATP.The Raman spectra were measured as a function of dipping time. At the initial stages of the adsorption of PATP on Ag, the Raman signals from PATP increased in proprtion to the square root of dipping time, suggesting that the adsorption rate was conditioned by the diffusion of PATP in the solution. The Raman band due to the Ag-S stretching vibration was also detected at near 220cm^<-1>, which demonstrates a direct contact of the S atom with Ag. These results were supported by our FT-IR experiments. 2) Raman scattering was measured for iron pentacarbonyl (IPC) deposited in vacuum at 120K on flat and rough Ag film surfaces. At elevated temperatures IPC was molecularly desorbed from the surface. Illumination of IPC with UV light from a low pressure Hg lamp decreased the Raman signals, but no significant changes were observed in the spectra. Upon heating the substrate up to 200K under UV irradiation, the two C-O stretch bands in the 2000 cm^<-1> region disappeared and, instead, two novel bands appeared. These spectral changes are thought to arise from a structural change of IPC or its conversion into other Fe-carbonyl species. Another spectral change was found near 260K under UV illumination. It should be noted that the Raman signals were more intense on rough silver surfaces than on flat ones. This enhancement of Raman signals from the rough surfaces are explained by the SPP excitations of Ag. Thus, through these investigations, we could demonstrate the usefulness of the SPP-aided Raman spectroscopy in getting information on surface reactions and deposition processes, most of which had been ambiguous.
赤外および質量分析法によるAI系薄膜堆積過程の複合その場解析

和田山智正

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1994 - 1994

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本研究の主眼は、固体表面(基板)上において進行する薄膜成長過程を、表面および気相の両面から分子レベルで、しかも実際の堆積条件下でリアルタイム測定することにある。具体的には、表面反応分析法としての偏光変調赤外分光法(PM-IR)に対して、気相反応測定用の四重極質量分析法(QMS)を併用した。原料ガスにはジメチル水素化Al((CH_3)_2AlH;DMAH)を用い、アモルファスSi(a-Si)基板上へのAl薄膜の化学気相堆積(Chemical Vapor Deposition;CVD)過程を対象として、a-Si中の水素化およびフッ化Si化学種の動的挙動に着目したその場測定を行った。本研究を通じて得られた結果を以下にまとめる。・DMAH/a-Si:H系光CVD法により323Kで成膜したa-Si:Hを基板として用いた。成膜後その温度でDMAHを暴露するとa-Si:H膜中のSiH_3種のみが反応により失われるのに対して、573Kに加熱後暴露を行うとSiH_3種に加えSiH_2種も反応に関与した。すなわち、前者の方が後者に比較してDMAHに対する反応性が高いことがわかる。また、180秒以上暴露を続けても赤外吸収強度の減少は認められないことから、DMAHと水素化Si種の反応はa-Si:H表面だけに限られ、膜内部には進行しないことが推定された。またこの様な変化は、紫外光照射下でのみ観測され、紫外光が反応を促進することが明らかとなった。・DMAH/a-Si:H:F系化学堆積法により373Kで成膜したa-Si:H:Fを基板として用いた。この場合、373K以上でDMAHを暴露することによりフッ化Si種の赤外強度が減少すると同時に水素化Si種の吸収強度が増加した。すなわち、水素化Si種よりもフッ化Si種の方がDMAHとの反応性に富むことがわかった。
Study on Thin Film Growth Competitive

System: Grant-in-Aid for Scientific Research

1989/04 -
光化学反応における固体表面過程のその場測定法の研究

末高洽, 和田山智正

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特定研究

Institution: 東北大学

1986 - 1986

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雰囲気中の固体表面に存在する化学種の挙動が光照射下で測定できれば、その表面において進行する光化学過程の研究に重要な情報が得られる。この研究では偏光変調赤外分光法のこの目的への応用を試みた。その理由は、この方法は雰囲気の赤外吸収を消去すると同時に、表面化学種の振動スペクトルの高感度での測定を可能にするからである。本年度は光CVD法により成長するa-Si薄膜中のSiHn種の挙動をその場測定した。a-Si薄膜(膜厚<50【A!゜】)はジシラン-窒素混合ガスに水銀灯からの紫外光を照射して金蒸着膜表面上に成長させた。基板温度を室温とし、全圧を113Paとすると、-Si【H_3】種の振動による赤外吸収が測定された。基板温度を473Kに上昇させると、-Si【H_3】種のほかに>Si【H_2】または(Si【H_2】)n種に帰属できる赤外吸収があらわれる。しかし、室温で生成した薄膜を473Kに加熱しても>Si【H_2】種の赤外吸収は出現しない。この事は薄膜中に存在する-Si【H_3】種は安定である事を意味する。したがって、SiHn種の構造は気相から飛来した活性種が固相表面に到達した時の条件によって決定されると結論した。同一照射時間におけるSiHn種の赤外吸収強度は全圧667Paで最大になる。これに対し、膜厚は全圧の増加とともに減少する。また、膜厚は時間に比例して増加するのに、SiHn種の赤外吸収強度は時間に比例せず飽和の傾向を示す。このことは、薄膜中のSiHn種の濃度が成膜条件とか、膜の成長に伴なって変化する事を意味する。なお、a-Siについてこれまでの研究で見出されたSiO種の吸収は存在せず、酸素の導入によってはじめて出現した。すなわち、これまでに測定されたSiOはa-Siを空気中に取出した際に生じたものであることが明らかになった。

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Social Activities 8

日本金属学会分科会委員

2007/04 - 2009/03

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分科会の活動
日本金属学会誌編集委員

2007/04 - 2009/03

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日本金属学会誌、欧文誌の編集委員
日本金属学会会報編集委員

2003/04 - 2005/03

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会報編集業務
水素社会の実現を目指して

2017/09/01 -

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宮城県では「みやぎ水素エネルギー利活用推進ビジョン」を策定し、「水素社会」の実現に向けた取組みを推進しています。今年度9月・10月号の『みやぎ県政だより』では、特集「水素社会の実現を目指して」と題して環境材料表面科学分野の和田山智正教授をゲストに迎え、水素エネルギーの特徴や用途について解説を頂き、新しいクリーンエネルギーの普及啓発を図りました。
産学官連携フェア2015みやぎ

2015/12/09 -

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「産学官連携フェア2015みやぎ」で水素関係の技術課題に関する講演を行った。
みやぎ水素利活用シンポジウムパネリスト

2015/11/20 -

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宮城水素利活用シンポジウムでパネリストを務め、水素社会実現のための要素技術に関する紹介を行った。
仙台高専における出前授業

2015/10/09 -

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材料表面における原子・分子の振るまいー燃料電池自動車とその心臓部である触媒を例としてーと題する出前授業を行った。
高崎高校模擬授業

2015/09/09 -

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材料表面における原子・分子の振るまいー燃料電池自動車の心臓部である電極触媒を例としてーと題して模擬授業を工学部カタールキャンパスフォールで行った。

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Other 18

相互拡散バリアとなる中間層の開発

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高活性、高耐久性を有する酸素還元触媒開発のため、中間層を有するコアシェルモデル構造を構築し、その特性を明らかにして、実触媒開発にフィードバックする。
水素循環エネルギープロセスにおけるCO2固定化のための合金最表面構造制御

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Cu単結晶をベース基板とし第２元素ＸとしてPdなどを添加したCu基2元合金表面系をCO2固定化触媒開発のテンプレートとして捉え、構築したCu-X表面の触媒能と幾何学的構造との関係について検討する。得られた結果をふまえ水素循環型エネルギープロセスにCO2固定化を組み込み低炭素社会の新エネルギー循環を見据える。
Pt-X合金単結晶」の燃料電池電極触媒活性

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モデル合金単結晶表面のMBE構築と酸素還元反応活性に関する研究
Pt基合金の最表面構造最適化に基づくモデルコアシェル触媒開発

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ドライプロセス(UHV中におけるMBE法)を用いて最表面白金濃縮層(Ptスキン)を有するPt-X（X=卑金属）モデル合金触媒やPt-Xモデルコアシェル触媒の製造技術、さらにモデル触媒のORR活性やORR過程前後における最表面幾何学的構造や電子構造変化に関する解析技術を確立する。その上で、開発したPt-Xモデル合金触媒最表面構造の動作(電気化学)環境における安定性(耐久性)を検討し、高活性と高耐久性を両立した卑金属をコアとする白金コアシェル触媒の開発設計指針を明確化する。
モデル電極を用いた触媒活性と物性との相関解析

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燃料電池電極触媒用モデル電極表面をMBE法により作製し、その電気化学特性を検討する
Fe族遷移金属-Pt合金系の表面構造と化学機能

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Pt単結晶基板上にFe族金属元素をMBE成長させPt基2元表面合金系を構築し、その構造規則性を低速電子線回折(LEED)や反射高速電子線回折(RHEED)により明らかにする。その上で、H2,O2,COやH2Oといった燃料電池反応を担う分子の表面挙動との関係を高感度反射赤外分光法(IRRAS)および昇温脱離(TPD)を用いて議論する。
Pt基電極触媒モデルの実験的構築と表面分子挙動観察

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・超高真空下、燃料電池モデル合金触媒表面の構築と関連分子挙動を低速電子線回折（LEED）・高感度反射赤外分光（IRRAS）および昇温脱離測定（TPD）により複合その場解析する手法を確立する。・Pt-X(Co,Ni)モデル合金表面やモデル担体担持合金表面において、O2,D2O,D,CO等を念頭にカソードおよびアノード関連分子挙動について明らかにする。
MBE構築Pt基規則合金表面の燃料電池電極触媒研究用テンプレートとしての活用

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水素エネルギー循環プロセスを達成するために重要な高活性かつ耐被毒特性に優れた触媒開発を念頭にPt基合金モデル触媒をMBE法により作製しその表面化学特性を検討する。具体的には、H2やCH3OH等の原料やCO等の不純物が原子レベルで構造を規定したPt-X合金表面において如何に振る舞うかを表面電子線回折及び分光学的手法により明らかにする。
fcc-Fe/遷移金属２元合金系の表面化学特性

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Ptなどfcc遷移金属単結晶基板上にFe薄膜をMBE成長させFe系２元合金表面とした際の構造規則性と化学特性の関係を明らかにする
金ナノ微粒子/アルカンチオール自己組織化膜/Au(111)ヘテロ構造の表面増強ラマン散乱による研究

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金ナノ微粒子/アルカンチオール自己組織化膜/Au(111)ヘテロ構造を作製し、表面増強ラマン散乱法により金ナノ微粒子の膜厚とラマン散乱強度との関連を調査した。
表面THｚ分光法に関する研究

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THz分光を表面・薄膜測定に対して拡張することを目指した共同研究
fcc-Fe薄膜堆積過程におけるサーファクタント効果に関する研究

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サーファクタント効果を利用したMBE法によるfcc-Fe薄膜堆積過程について、RHEEDおよび赤外複合その場観察を行ってそのメカニズムについて検討した。
MIMトンネル接合利用した多孔質Siへのホットエレクトロン注入

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多孔質Si基板上にMIMトンネル接合を作製し電圧を印加したさいのI-V曲線について検討した。
水素終端Si表面上へのAl堆積

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ジメチル水素化Alを原料ガスとして用い水素終端Si表面上への金属Alの堆積過程を赤外ATR法を用いて超高真空下検討した。
a-Si:H/ジメチル水素化Al反応過程の赤外その場観察

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光CVD法により得たa-Si:H薄膜表面にジメチル水素化Alを暴露した際の変化を赤外分光法により検討した。
気相薄膜成長過程のその場赤外観察

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光CVDa-Si:H、SiNx薄膜堆積過程の赤外分光法および質量分析法によるその場観察を行いその有用性を実証した。
Si窒化膜CVD過程のその場赤外観察に関する研究

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Si窒化膜CVD過程をその場赤外観察し、成長表面層の存在を明らかにした。
気相薄膜堆積過程の偏光変調赤外分光法による研究

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偏光変調赤外分光法により、光CVD法による薄膜堆積過程をその場観察した。

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