Details of the Researcher

PHOTO

Takashi Itoh
Section
Frontier Research Institute for Interdisciplinary Sciences
Job title
Associate Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（石巻専修大学）

Committee Memberships 21

  • 一般社団法人 表面技術協会　理事

    2025/02 - Present

  • 公益社団法人 電気化学会 東北支部　事務幹事

    2014/04 - Present

  • 公益社団法人 電気化学会　ナノ界面・表面研究懇談会 常任理事

    2007/02 - Present

  • 社団法人 表面技術協会　東北支部幹事

    2003/04 - Present

  • ナノ界面・表面研究懇談会　東北支部幹事

    2000/04 - Present

  • 公益社団法人 電気化学会　広報委員会 委員

    2022/04 - 2024/03

  • 公益社団法人 電気化学会　大会学術企画委員会 委員

    2022/04 - 2024/03

  • 公益社団法人 電気化学会　大会改革タスクフォース 委員

    2023/08 - 2023/12

  • 公益社団法人 電気化学会　2022 年電気化学秋季大会実行委員会 委員

    2022/06 - 2022/09

  • 一般社団法人表面技術協会　評議員

    2018/04 - 2019/03

  • 公益社団法人 電気化学会 産学官フォーラム運営委員会　運営委員

    2015/03 - 2017/03

  • 公益社団法人 電気化学会　理事

    2014/03 - 2016/03

  • 公益社団法人電気化学会　大会学術企画委員

    2011/03 - 2013/02

  • 社団法人 表面技術協会　評議員

    2007/02 - 2011/01

  • 公益社団法人 電気化学会 電池技術委員会　ゲストエディター

    2009/11 - 2010/02

  • 日本化学会 東北支部　会計監査

    2009/03 - 2010/02

  • 公益社団法人 電気化学会　電気化学会誌 編集委員

    2006/02 - 2010/02

  • 日本化学会 東北支部　幹事長

    2008/02 - 2009/02

  • 公益社団法人 電気化学会　評議員

    2006/02 - 2008/02

  • 日本化学会　東北支部 地方大会 プログラム編成委員

    2005/07 -

  • 日本化学会　東北支部 地方大会 プログラム編成委員

    2004/07 -

Show all ︎Show first 5

Professional Memberships 6

  • 表面科学会

  • 表面技術協会

  • アメリカ電気化学会

  • American Chemical Society

  • The Electrochemical Society of Japan

  • The Chemical Society of Japan

︎Show all ︎Show first 5

Research Areas 1

  • Nanotechnology/Materials / Basic physical chemistry / Surface Science

Awards 5

  1. Asia Pacific Society for Materials Research 2019 Annual Meeting

    2019/07　Asia Pacific Society for Materials Research　In Situ Raman Analysis for High Capacity Zinc Anode in Alkaline Solutions

  2. 日本表面科学会 論文賞

    2011/12　公益社団法人 日本表面科学会　Raman-Scattering Spectroscopy of Epitaxial Graphene Formed on SiC Film on Si Substrate

  3. インテリジェント・コスモス奨励賞

    2007/05　財団法人インテリジェント・コスモス学術振興財団　有機化合物－導電固体電極界面のその場ラマン分光解析と機能発現

  4. Award of The Committee of Battery Technology, The Electrochemical Society of Japan

    2003/11　電気化学会 電池技術委員会　その場ラマン散乱分光法によるリチウムマンガンスピネルの解析

  5. The Electrochemical Society of Japan, Young Investigator Award

    2003/04　電気化学会　エネルギー変換デバイスのその場ラマン分光と電気化学測定に関する研究

Papers 148

  1. Formation mechanism of micro-sized Cu plates using Br ions as basal plane-specific adsorbent and their application in the preparation of highly conductive and flexible Cu films Peer-reviewed

    Yusaku Noda, Shun Yokoyama, Takashi Itoh, Balachandran Jeyadevan

    Journal of Materials Chemistry C　2024

    DOI： 10.1039/D4TC02694B 　

  2. Enhanced Photoanodic Activity and Outermost Surface Crystallinity of Tungsten Oxide via High-temperature Sintering Peer-reviewed

    Toshiyuki Abe, Hideya Tsuchikado, Mitsuharu Chisaka, Takashi Itoh, Guoqing Guan, Abuliti Abudula

    Electrocatalysis　15　(1)　120-127　2023/12/20

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s12678-023-00859-2 　

    ISSN： 1868-2529

    eISSN： 1868-5994

  3. Synthesis and Characterization of Ionic Li+@C70 Endohedral Fullerene Peer-reviewed

    Hiroshi Ueno, Daiki Kitabatake, Takuya Mabuchi, Shinobu Aoyagi, Takashi Itoh, Ting Deng, Fuminori Misaizu

    Chemistry – A European Journal　2023/11/30

    Publisher: Wiley

    DOI： 10.1002/chem.202303908 　

    ISSN： 0947-6539

    eISSN： 1521-3765

    More details Close

    Ion‐endohedral‐fullerene has attracted growing interest due to the unique electronic and structural characteristics arising from its distinctive ionic nature. Although there has been only one reported ion‐encapsulated fullerene, Li+@C60, a significant number of fundamental and applied studies have been conducted, making a substantial impact not only in chemistry and physics but also across various interdisciplinary research fields. Nevertheless, studies on ion‐endohedral fullerenes are still in their infancy due to the limitations in variety, and hence, it remains an open question how the size and symmetry of fullerene, as well as the motion and position of the encapsulated ion, affect their physical/chemical properties. Herein, we report the synthesis of lithium‐ion‐endohedral [70]fullerene (Li+@C70 X−, X=PF6− and TFSI−), a novel ionic endohedral fullerene. X‐ray crystallography confirmed the encapsulation of Li+ by C70 cage as well as its ion‐pair structure stabilized by external TFSI− counter anion. The encapsulated Li+ drastically lowered the orbital energy of the C70 cage by Coulomb interactions but did not affect the orbital energy gap and degeneracy. DFT studies were also performed, which supported the experimentally observed electronic effects caused by the encapsulated Li+.

  4. Controlled Solvation Structure of a Zn Ion in an Aqueous Electrolyte by Amine Additives for Long Cycle Life of a Large Capacity Zn-Air Rechargeable Battery Peer-reviewed

    Tatsumi Ishihara, Yuiko Inoishi, Sun Kim, Aleksandar Staykov, Motonori Watanabe, Nao Naohara, Kimiko Takahashi, Takashi Itoh

    The Journal of Physical Chemistry C　127　(14)　6619-6628　2023/04/04

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.jpcc.2c08682 　

    ISSN： 1932-7447

    eISSN： 1932-7455

  5. One-pot multi-step synthesis of high-aspect-ratio Cu nanowires based on an environment-friendly manner for low-cost and high-performance transparent conductive films Peer-reviewed

    Yuta Umemoto, Shun Yokoyama, Kenichi Motomiya, Takashi Itoh

    Colloids and Surfaces A: Physicochemical and Engineering Aspects　651　129692-129692　2022/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.colsurfa.2022.129692 　

    ISSN： 0927-7757

  6. Highly crystalline graphite-like carbon from wood via low-temperature catalytic graphitization Peer-reviewed

    Yuta Nakayasu, Yasuto Goto, Yuto Katsuyama, Takashi Itoh, Masaru Watanabe

    Carbon Trends　8　2022/07

    DOI： 10.1016/j.cartre.2022.100190 　

    eISSN： 2667-0569

  7. Synthesis of unused-wood-derived C-Fe-N catalysts for oxygen reduction reaction by heteroatom doping during hydrothermal carbonization and subsequent carbonization in nitrogen atmosphere Peer-reviewed

    Yasuto Goto, Yuta Nakayasu, Hiroya Abe, Yuto Katsuyama, Takashi Itoh, Masaru Watanabe

    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences　379　(2209)　2021/11/01

    DOI： 10.1098/rsta.2020.0348 　

    ISSN： 1364-503X

  8. Flexible and adhesive sintered Cu nanomaterials on polyimide substrates prepared by combining Cu nanoparticles and nanowires with polyvinylpyrrolidone Peer-reviewed

    Shun Yokoyama, Junpei Nozaki, Yuta Umemoto, Kenichi Motomiya, Takashi Itoh, Hideyuki Takahashi

    Colloids and Surfaces A: Physicochemical and Engineering Aspects　625　126907-126907　2021/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.colsurfa.2021.126907 　

    ISSN： 0927-7757

  9. Control of galvanic replacement reaction between Cu nanowires and Ag species under vacuum filtration for transparent conductive films with long-term durability Peer-reviewed

    Shun Yokoyama, Yuta Umemoto, Kenichi Motomiya, Takashi Itoh, Hideyuki Takahashi

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS　611　2021/02

    DOI： 10.1016/j.colsurfa.2020.125809 　

    ISSN： 0927-7757

    eISSN： 1873-4359

  10. Functionalization of primary amine groups to single-walled carbon nanotubes by reacting fluorinated SWCNTs with ammonia gas at a low temperature Peer-reviewed

    Koji Yokoyama, Yoshinori Sato, Masashi Yamamoto, Tetsuo Nishida, Takashi Itoh, Kenichi Motomiya, Yoshinori Sato

    Carbon　172　360-371　2021/02

    Publisher: Elsevier BV

    DOI： 10.1016/j.carbon.2020.10.038 　

    ISSN： 0008-6223

  11. Spectroscopic Analysis of Rechargeable Lithium-Ion Battery Electrolyte Solution by a Compact FTIR System located in a Glovebox Invited Peer-reviewed

    Takashi Itoh

    35　2-5　2021/01

  12. グローブボックス中に設置した小型FTIRによるリチウム2次電池電解液の分光解析 Invited Peer-reviewed

    伊藤 隆

    FTIR TALK LETTER　35　2-5　2020

  13. 電気化学反応のその場ラマン分光法 Invited Peer-reviewed

    Takashi Itoh

    Denki Kagaku　87　(Spring)　43-56　2019/03/05

    Publisher: The Electrochemical Society of Japan

    DOI： 10.5796/denkikagaku.19-te0001 　

    ISSN： 2433-3255

    eISSN： 2433-3263

  14. Electrochemical capacitors using nitrogen-doped vertically aligned multi-walled carbon nanotube electrodes prepared by defluorination Peer-reviewed

    Rei Nonomura, Takashi Itoh, Yoshinori Sato, Koji Yokoyama, Masashi Yamamoto, Tetsuo Nishida, Kenichi Motomiya, Kazuyuki Tohji, Yoshinori Sato

    Carbon　132　539-547　2018/06/01

    Publisher: Elsevier Ltd

    DOI： 10.1016/j.carbon.2018.02.071 　

    ISSN： 0008-6223

  15. Mixed ether-based solvents provide a long cycle life with high rate capability to graphite anodes for Na-ion batteries Peer-reviewed

    Tetsuya Kajita, Takashi Itoh

    Physical Chemistry Chemical Physics　20　(4)　2188-2195　2018

    Publisher: Royal Society of Chemistry

    DOI： 10.1039/c7cp06998g 　

    ISSN： 1463-9076

  16. A dual-functional organic p-n bilayer catalyst comprising a perylene derivative and cobalt phthalocyanine working under illumination and in the dark Peer-reviewed

    Toshiyuki Abe, Masato Okumura, Yuko Kikuchi, Takashi Itoh, Keiji Nagai

    JOURNAL OF MATERIALS CHEMISTRY A　5　(16)　7445-7450　2017/04

    DOI： 10.1039/c7ta00174f 　

    ISSN： 2050-7488

    eISSN： 2050-7496

  17. Ether-based solvents significantly improved electrochemical performance for Na-ion batteries with amorphous GeOx anodes Peer-reviewed

    Tetsuya Kajita, Takashi Itoh

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS　19　(2)　1003-1009　2017/01

    DOI： 10.1039/c6cp06354c 　

    ISSN： 1463-9076

    eISSN： 1463-9084

  18. Effect of Vanillin to Prevent the Dendrite Growth of Zn in Zinc-Based Secondary Batteries Peer-reviewed

    Mukkannan Azhagurajan, Akiyoshi Nakata, Hajime Arai, Zempachi Ogumi, Tetsuya Kajita, Takashi Itoh, Kingo Itaya

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　164　(12)　A2407-A2417　2017

    DOI： 10.1149/2.0221712jes 　

    ISSN： 0013-4651

    eISSN： 1945-7111

  19. Ultra-High-Resolution Differential Interference Microscopy of Ag Deposition on an Ultraflat Au(111) Peer-reviewed

    M. Azhagurajan, T. Itoh, K. Itaya

    JOURNAL OF PHYSICAL CHEMISTRY C　120　(29)　16221-16227　2016/07

    DOI： 10.1021/acs.jpcc.6b01668 　

    ISSN： 1932-7447

  20. In Situ Electrochemical Raman Spectroscopy of Air-Oxidized Semiconducting Single-Walled Carbon Nanotube Bundles in Aqueous Sulfuric Acid Solution Peer-reviewed

    Shin-ichi Ogino, Takashi Itoh, Daiki Mabuchi, Koji Yokoyama, Kenichi Motomiya, Kazuyuki Tohji, Yoshinori Sato

    JOURNAL OF PHYSICAL CHEMISTRY C　120　(13)　7133-7143　2016/04

    DOI： 10.1021/acs.jpcc.5b12057 　

    ISSN： 1932-7447

  21. Electrochemical sodium storage in amorphous GeOx powder Peer-reviewed

    Tetsuya Kajita, Takashi Itoh

    ELECTROCHIMICA ACTA　195　192-198　2016/03

    DOI： 10.1016/j.electacta.2016.02.117 　

    ISSN： 0013-4686

    eISSN： 1873-3859

  22. In Situ Visualization of Lithium Ion Intercalation into MoS2 Single Crystals using Differential Optical Microscopy with Atomic Layer Resolution Peer-reviewed

    Mukkannan Azhagurajan, Tetsuya Kajita, Takashi Itoh, Youn-Geun Kim, Kingo Itaya

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY　138　(10)　3355-3361　2016/03

    DOI： 10.1021/jacs.5b11849 　

    ISSN： 0002-7863

  23. Energy storage in batteries and fuel cells Peer-reviewed

    Tetsuya Kajita, Takashi Itoh

    Lecture Notes in Energy　32　105-122　2016/02/01

    Publisher: Springer Verlag

    DOI： 10.1007/978-3-319-25400-5_7 　

    ISSN： 2195-1292 2195-1284

    eISSN： 2195-1292

  24. Electrochemical Performance of Amorphous GeOx Powder Synthesized by Oxidation of NaGe Serving as an Anode for Lithium Ion Batteries Peer-reviewed

    Tetsuya Kajita, Takashi Itoh

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　163　(3)　A552-A556　2016

    DOI： 10.1149/2.0931603jes 　

    ISSN： 0013-4651

    eISSN： 1945-7111

  25. 電気化学界面におけるその場ラマン分光解析 Invited Peer-reviewed

    伊藤 隆

    応用物理　85　(9)　754-760　2016

    Publisher:

    ISSN： 0369-8009

  26. Electrochemical performance of highly amorphous GeOx powders synthesized in different alcohols for use in Na- and Li-ion batteries Peer-reviewed

    T. Kajita, T. Itoh

    RSC ADVANCES　6　(104)　102109-102115　2016

    DOI： 10.1039/c6ra20794d 　

    ISSN： 2046-2069

  27. Electrochemical Na-intercalation-induced high-temperature superconductivity in FeSe Peer-reviewed

    Tetsuya Kajita, Takayuki Kawamata, Takashi Noji, Takehiro Hatakeda, Masatsune Kato, Yoji Koike, Takashi Itoh

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　519　104-107　2015/12

    DOI： 10.1016/j.physc.2015.09.005 　

    ISSN： 0921-4534

    eISSN： 1873-2143

  28. Green synthesis and formation mechanism of nanostructured Bi2Te3 using ascorbic acid in aqueous solution Peer-reviewed

    Shun Yokoyama, Keita Sato, Makoto Muramatsu, Takehiro Yamasuge, Takashi Itoh, Kenichi Motomiya, Hideyuki Takahashi, Kazuyuki Tohji

    ADVANCED POWDER TECHNOLOGY　26　(3)　789-796　2015/05

    DOI： 10.1016/j.apt.2015.02.002 　

    ISSN： 0921-8831

    eISSN： 1568-5527

  29. Preparation and characterization of ultraflat Pt facets by atom-height-resolved differential optical microscopy Peer-reviewed

    M. Azhagurajan, R. Wen, Y. G. Kim, T. Itoh, K. Sashikata, K. Itaya

    SURFACE SCIENCE　631　57-62　2015/01

    DOI： 10.1016/j.susc.2014.07.031 　

    ISSN： 0039-6028

    eISSN： 1879-2758

  30. Structural and Electrochemical Characterization of Ethylenediaminated Single-Walled Carbon Nanotubes Prepared from Fluorinated SWCNTs Peer-reviewed

    Kohei Bushimata, Shin-ichi Ogino, Kazutaka Hirano, Tatsuhiro Yabune, Kenta Sato, Takashi Itoh, Kenichi Motomiya, Koji Yokoyama, Daiki Mabuchi, Hikaru Nishizaka, Go Yamamoto, Toshiyuki Hashida, Kazuyuki Tohji, Yoshinori Sato

    JOURNAL OF PHYSICAL CHEMISTRY C　118　(27)　14948-14956　2014/07

    DOI： 10.1021/jp503124n 　

    ISSN： 1932-7447

  31. Synthesis of metallic Cu nanoparticles by controlling Cu complexes in aqueous solution Peer-reviewed

    Shun Yokoyama, Hideyuki Takahashi, Takashi Itoh, Kenichi Motomiya, Kazuyuki Tohji

    ADVANCED POWDER TECHNOLOGY　25　(3)　999-1006　2014/05

    DOI： 10.1016/j.apt.2014.01.024 　

    ISSN： 0921-8831

    eISSN： 1568-5527

  32. In Situ Surface-enhanced Raman Analysis of Water Libration on Silver Electrode in Various Alkali Hydroxide Aqueous Solutions Peer-reviewed

    Takashi Itoh, Tetsuya Kajita, Toshiteru Maeda, Atsuo Kasuya

    ELECTROCHEMISTRY　82　(5)　396-400　2014/05

    DOI： 10.5796/electrochemistry.82.396 　

    ISSN： 1344-3542

  33. Synthesis of CaMn<inf>2</inf>O<inf>4</inf>-related electrocatalyst for Oxygen evolution electrode of watersplitting

    Yuya Taki, Zhenquan Tan, Satoshi Ohara, Takashi Itoh, Yoshiaki Nakano, Katsushi Fujii, Masakazu Sugiyama

    Materials Research Society Symposium Proceedings　1640　(January)　12-17　2014

    DOI： 10.1557/opl.2014.406 　

    ISSN： 0272-9172

  34. Surface modification of Cu metal particles by the chemical reaction between the surface oxide layer and a halogen surfactant Peer-reviewed

    Shun Yokoyama, Hideyuki Takahashi, Takashi Itoh, Kenichi Motomiya, Kazuyuki Tohji

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　75　(1)　68-73　2014/01

    DOI： 10.1016/j.jpcs.2013.08.010 　

    ISSN： 0022-3697

    eISSN： 1879-2553

  35. Orbital-specific Tunability of Many-Body Effects in Bilayer Graphene by Gate Bias and Metal Contact Peer-reviewed

    Hirokazu Fukidome, Masato Kotsugi, Kosuke Nagashio, Ryo Sato, Takuo Ohkochi, Takashi Itoh, Akira Toriumi, Maki Suemitsu, Toyohiko Kinoshita

    SCIENTIFIC REPORTS　4　3713-1-3713-5　2014/01

    DOI： 10.1038/srep03713 　

    ISSN： 2045-2322

  36. Novel nickel-palladium catalysts encased in a platinum nanocage Peer-reviewed

    Balachandran Jeyadevan, Jhon L. Cuya, Yoshinori Inoue, Kozo Shinoda, Takashi Ito, Derrick Mott, Koichi Higashimine, Shinya Maenosono, Takatoshi Matsumotob, Hiroshi Miyamuraa

    RSC ADVANCES　4　(51)　26667-26672　2014

    DOI： 10.1039/c4ra03091e 　

    ISSN： 2046-2069

  37. Elucidation of the reaction mechanism during the removal of copper oxide by halogen surfactant at the surface of copper plate Peer-reviewed

    Shun Yokoyama, Hideyuki Takahashi, Takashi Itoh, Kenichi Motomiya, Kazuyuki Tohji

    Applied Surface Science　264　664-669　2013/01/01

    DOI： 10.1016/j.apsusc.2012.10.088 　

    ISSN： 0169-4332

  38. Direct Evidence of Homoepitaxial Growth in the Electrodeposition of Au Observed by Ultra-High Resolution Differential Optical Microscopy Peer-reviewed

    M. Azhagurajan, R. Wen, A. Lahiri, Y. G. Kim, T. Itoh, K. Itaya

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　160　(9)　D361-D365　2013

    DOI： 10.1149/2.057309jes 　

    ISSN： 0013-4651

    eISSN： 1945-7111

  39. Spectroscopic characterization of dragonfly wings common in Japan Peer-reviewed

    Akira Yoshihara, Atsushi Miyazaki, Toshiteru Maeda, Yoshika Imai, Takashi Itoh

    VIBRATIONAL SPECTROSCOPY　61　85-93　2012/07

    DOI： 10.1016/j.vibspec.2012.03.010 　

    ISSN： 0924-2031

    eISSN： 1873-3697

  40. Photoluminescence changes in n-type GaN samples after photoelectrochemical treatment Peer-reviewed

    Katsushi Fujii, Kayo Koike, Mika Atsumi, Takenari Goto, Takashi Itoh, Takafumi Yao

    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 3-4　9　(3-4)　715-718　2012

    DOI： 10.1002/pssc.201100310 　

    ISSN： 1862-6351

  41. In Situ 測定，ラマン分光法－リチウムイオン電池－ Invited Peer-reviewed

    伊藤隆

    Electrochemistry　79　(11)　907-910　2011/11/01

    Publisher:

    DOI： 10.5796/electrochemistry.79.907 　

    ISSN： 1344-3542

  42. Molecular Hydrogen Evolution by Organic p/n Bilayer Film of Phthalocyanine/Fullerene in the Entire Visible-Light Energy Region Peer-reviewed

    Toshiyuki Abe, Shunsuke Tobinai, Naohiro Taira, Junpei Chiba, Takashi Itoh, Keiji Nagai

    JOURNAL OF PHYSICAL CHEMISTRY C　115　(15)　7701-7705　2011/04

    DOI： 10.1021/jp1094992 　

    ISSN： 1932-7447

  43. Effects of GaN thin layer on InGaN at electrolyte-semiconductor interface for the application of photoelectrochemical water splitting Peer-reviewed

    Katsushi Fujii, Kayo Koike, Mika Atsumi, Takashi Itoh, Takenari Goto, Takafumi Yao, Masakazu Sugiyama, Yoshiaki Nakano

    Materials Research Society Symposium Proceedings　1387　16-21　2011

    DOI： 10.1557/opl.2012.769 　

    ISSN： 0272-9172

  44. Time dependence of water-reducing photocurrent with change of the characteristics of n-type GaN photo-illuminated working electrodes Peer-reviewed

    Katsushi Fujii, Kayo Koike, Mika Atsumi, Takenari Goto, Takashi Itoh, Takafumi Yao

    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 7-8　8　(7-8)　2457-2459　2011

    DOI： 10.1002/pssc.201000937 　

    ISSN： 1862-6351

  45. Mechanical and tribological properties of boron, nitrogen-coincorporated diamond-like carbon films prepared by reactive radio-frequency magnetron sputtering Peer-reviewed

    H. Nakazawa, A. Sudoh, M. Suemitsu, K. Yasui, T. Itoh, T. Endoh, Y. Narita, M. Mashita

    DIAMOND AND RELATED MATERIALS　19　(5-6)　503-506　2010/05

    DOI： 10.1016/j.diamond.2010.01.026 　

    ISSN： 0925-9635

  46. Inhibition of the Dissolution of Fe from Fe-Pt Nano Particles by a Structural Phase Transitions Peer-reviewed

    Takashi Itoh, Masaki Uebayashi, Kazuyuki Tohji, Balachandran Jeyadevan

    ELECTROCHEMISTRY　78　(2)　157-160　2010/02

    DOI： 10.5796/electrochemistry.78.157 　

    ISSN： 1344-3542

  47. 再生可能サイクルへ向けた環境電気化学エネルギー変換デバイス Peer-reviewed

    伊藤隆

    Electrochemistry　78　(1)　50-75　2010

    Publisher:

    ISSN： 1344-3542

  48. 電極材料の過剰な負荷条件下におけるその場ラマン分光解析 Invited Peer-reviewed

    伊藤隆

    FC Reports　28　(2)　44-48　2010

    Publisher:

    ISSN： 0911-5269

  49. Effects of Silicon Source Gas and Substrate Bias on the Film Properties of Si-Incorporated Diamond-Like Carbon by Radio-Frequency Plasma-Enhanced Chemical Vapor Deposition Invited Peer-reviewed

    Hideki Nakazawa, Takeshi Kinoshita, Yuhta Kaimori, Yuhki Asai, Maki Suemitsu, Toshimi Abe, Kanji Yasui, Tetsuo Endoh, Takashi Itoh, Yuzuru Narita, Yoshiharu Enta, Masao Mashita

    JAPANESE JOURNAL OF APPLIED PHYSICS　48　(11)　116002-1-116002-8　2009/11

    DOI： 10.1143/JJAP.48.116002 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  50. 間欠ガス供給を用いたホットメッシュCVD法によるSi上GaNエピタキシャル成長 Peer-reviewed

    齋藤健, 永田一樹, 西山洋, 末光眞希, 伊藤隆, 遠藤哲郎, 中澤日出樹, 成田克, 高田雅介, 赤羽正志, 安井寛治

    電子情報通信学会 電子部品・材料研究会　109　(171)　61-66　2009/08/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Hot-mesh CVD with various gas supply modes for the epitaxial growth of gallium nitride (GaN) on Si was investigated for the improvement of its crystallinity and optical properties. The optimal interruption time in an intermittent TMG gas supply was also investigated. As a result, the good crystallinity of GaN films was obtained by an intermittent gas supply of TMG and a continuous supply of NH_3 gas. The best crystallinity was obtained at an interruption time of 8s.

  51. 有機シランを用いたプラズマCVD法によるダイヤモンドライクカーボン薄膜の膜特性評価 Peer-reviewed

    三浦創史, 中澤日出樹, 西崎圭太, 末光眞希, 安井寛治, 伊藤隆, 遠藤哲郎, 成田克

    電子情報通信学会技術研究報告　vol. 109　(No. 171)　13-18　2009/08/10

  52. Epitaxial Growth of GaN Films by Pulse-Mode Hot-Mesh Chemical Vapor Deposition Peer-reviewed

    Yasuaki Komae, Kanji Yasui, Maki Suemitsu, Tetsuo Endoh, Takashi Ito, Hideki Nakazawa, Yuzuru Narita, Masasuke Takata, Tadashi Akahane

    JAPANESE JOURNAL OF APPLIED PHYSICS　48　(7)　076509-1-076509-5　2009/07

    DOI： 10.1143/JJAP.48.076509 　

    ISSN： 0021-4922

  53. Atomic hydrogen etching of silicon-incorporated diamond-like carbon films prepared by pulsed laser deposition Peer-reviewed

    H. Nakazawa, H. Sugita, Y. Enta, M. Suemitsu, K. Yasui, T. Itoh, T. Endoh, Y. Narita, M. Mashita

    DIAMOND AND RELATED MATERIALS　18　(5-8)　831-834　2009/05

    DOI： 10.1016/j.diamond.2008.10.043 　

    ISSN： 0925-9635

  54. The growth of GaN films by alternate source gas supply hot-mesh CVD method Peer-reviewed

    Yasuaki Komae, Takeshi Saitou, Maki Suemitsu, Takashi Ito, Tetsuo Endoh, Hideki Nakazawa, Yuzuru Narita, Masasuke Takata, Tadashi Akahane, Kanji Yasui

    THIN SOLID FILMS　517　(12)　3528-3531　2009/04

    DOI： 10.1016/j.tsf.2009.01.021 　

    ISSN： 0040-6090

  55. Si 原料に有機シランを用いたプラズマCVD 法によるSi 添加DLC 膜の膜特性評価 Peer-reviewed

    三浦創史, 中澤日出樹, 西崎圭太, 末光眞希, 安井寛治, 伊藤隆, 遠藤哲郎, 成田克

    2009年春季第56回応用物理関係連合講演会　2009/03/31

  56. ホットメッシュCVD法を用いたGaN成長におけるパルスガス供給の効果 Peer-reviewed

    齋藤 健, 小前泰彰, 西山洋, 末光眞希, 伊藤 隆, 遠藤哲郎, 中澤日出樹, 成田 克, 高田雅介, 赤羽正志, 安井寛治

    日本物理学会春季大会　2009/03/30

  57. Raman-scattering spectroscopy of epitaxial graphene formed on SiC film on Si substrate Peer-reviewed

    Yu Miyamoto, Hiroyuki Handa, Eiji Saito, Atsushi Konno, Yuzuru Narita, Maki Suemitsu, Hirokazu Fukidome, Takashi Ito, Kanji Yasui, Hideki Nakazawa, Tetsuo Endoh

    e-Journal of Surface Science and Nanotechnology　7　107-109　2009/01/10

    DOI： 10.1380/ejssnt.2009.107 　

    ISSN： 1348-0391

  58. Erratum: Raman-Scattering Spectroscopy of Epitaxial Graphene Formed on SiC Film on Si Substrate [e-J. Surf. Sci. Nanotech. Vol. 7, pp. 107-109 (2009)]

    Miyamoto Yu, Handa Hiroyuki, Saito Eiji, Konno Atsushi, Narita Yuzuru, Suemitsu Maki, Fukidome Hirokazu, Ito Takashi, Yasui Kanji, Nakazawa Hideki, Endoh Tetsuo

    e-J. Surf. Sci. Nanotech.　7　699-699　2009

    Publisher: The Surface Science Society of Japan

    DOI： 10.1380/ejssnt.2009.699 　

    ISSN： 1348-0391

    More details Close

    In this article [Y. Miyamoto, et al., e-J. Surf. Sci. Nanotech. 7, 107 (2009)], we discussed formation of graphene on Si substrates assuming that the pre-grown 3C-SiC films on the Si(110) substrate are (111)-oriented. Later investigations suggest, however, that the 3C-SiC films used in this study are dominated by (110)- oriented portion, with the (111)-orientation being the minority. The comments on the (111)-orientation of the 3C-SiC films should therefore be omitted. This revision, however, does not affect our observation of graphene formation on Si substrates and the analyses thereon.[DOI: 10.1380/ejssnt.2009.699]

  59. 「酸素還元反応」の本質を探る－電気化学その場ラマン分光法を用いたアプローチ－ Invited Peer-reviewed

    伊藤隆

    化学と工業　62　(3)　258-259　2009

  60. Mechanical and Tribological Properties of Boron, Nitrogen-Coincorporated Diamond-Like Carbon Films Prepared by Reactive Radio-Frequency Magnetron Sputtering Peer-reviewed

    H. Nakazawa, A. Sudoh, M. Suemitsu, K. Yasui, T. Itoh, T. Endoh, Y. Narita, M. Mashita

    20th European Conference on Diamond, Diamond-Like Materials, Carbon Nanotubes, and Nitrides (Diamond 2009)　6-10　2009

  61. Thin-Film Deposition of Silicon-Incorporated Diamond-Like Carbon by Plasma-Enhanced Chemical Vapor Deposition Using Monomethylsilane as a Silicon Source Peer-reviewed

    Hideki Nakazawa, Yuhki Asai, Takeshi Kinoshita, Maki Suemitsu, Toshimi Abe, Kanji Yasui, Takashi Itoh, Tetsuo Endoh, Yuzuru Narita, Atsushi Konno, Yoshiharu Enta, Masao Mashita

    JAPANESE JOURNAL OF APPLIED PHYSICS　47　(11)　8491-8497　2008/11

    DOI： 10.1143/JJAP.47.8491 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  62. レーザーアブレーション法によるSi添加DLC膜の原子状水素エッチング Peer-reviewed

    中澤日出樹, 杉田寛臣, 遠田義晴, 末光眞希, 安井寛治, 伊藤 隆, 遠藤哲郎, 成田 克, 真下正夫

    第２２回 ダイヤモンドシンポジウム　2008/10/22

  63. 第6回化学イノベーションシンポジウム”明日を開く科学のとびら”と杜の都の夏 Invited Peer-reviewed

    伊藤隆, 板谷謹悟

    化学と工業　61　(7)　732　2008/07/04

  64. "Temperature oscillation" as a real-time monitoring of the growth of 3C-SiC on Si substrate Peer-reviewed

    Eiji Saito, Atsushi Konno, Takashi Ito, Kanji Yasui, Hideki Nakazawa, Tetsuo Endoh, Yuzuru Narita, Maki Suemitsu

    APPLIED SURFACE SCIENCE　254　(19)　6235-6237　2008/07

    DOI： 10.1016/j.apsusc.2008.02.190 　

    ISSN： 0169-4332

    eISSN： 1873-5584

  65. メッシュ状金属キャタライザを用いたGaN結晶のエピタキシャル成長 Invited Peer-reviewed

    安井寛治, 末光眞希, 遠藤哲郎, 伊藤隆, 中澤日出樹, 成田克, 高田雅介, 赤羽正志

    第5回Cat-CVD研究会　2008/06/20

  66. Hot-mesh CVD法を用いた原料ガスパルス供給によるGaN成長 Peer-reviewed

    小前泰彰, 齋藤健, 末光眞希, 遠藤哲郎, 伊藤隆, 中澤日出樹, 成田克, 高田雅介, 赤羽正志, 安井寛治

    第5回Cat-CVD研究会　2008/06/20

  67. 触媒反応CVD (Cat-CVD) 法によるGaN結晶膜の省資源成長技術 Peer-reviewed

    安井寛治, 深田祐介, 安部和貴, 黒木雄一郎, 末光眞希, 伊藤 隆, 成田 克, 遠藤哲郎, 中澤日出樹, 高田雅介, 赤羽正志

    電子情報通信学会2008年総合大会　エレクトロニクス講演論文集2　(C-6-8)　26-27　2008/03/20

    Publisher:

  68. Epitaxial growth of SiC on Silicon on Insulator substrates with ultrathin top Si layer using hot-mesh chemical vapor deposition Peer-reviewed

    47　(1)　669-672　2008/01/22

    Publisher:

    DOI： 10.1143/JJAP.47.569 　

  69. Growth of GaN on SiC/Si substrates using AlN buffer layer by hot-mesh CVD Peer-reviewed

    Kazuyuki Tamura, Yuichiro Kuroki, Kanji Yasui, Maki Suemitsu, Takashi Ito, Tetsuro Endou, Hideki Nakazawa, Yuzuru Narita, Masasuke Takata, Tadashi Akahane

    THIN SOLID FILMS　516　(5)　659-662　2008/01

    DOI： 10.1016/j.tsf.2007.06.200 　

    ISSN： 0040-6090

    eISSN： 1879-2731

  70. Growth of GaN films by hot-mesh chemical vapor deposition using ruthenium-coated tungsten mesh Peer-reviewed

    Yusuke Fukada, Kanji Yasui, Yuichiro Kuroki, Maki Suemitsu, Takashi Ito, Tetsuro Endou, Hideki Nakazawa, Yuzuru Narita, Masasuke Takata, Tadashi Akahane

    JAPANESE JOURNAL OF APPLIED PHYSICS　47　(1)　573-576　2008/01

    DOI： 10.1143/JJAP.47.573 　

    ISSN： 0021-4922

  71. ホットメッシュCVD法によるGaN成長－ルテニウムタングステンメッシュの効果－ Peer-reviewed

    深田祐介, 安部和貴, 黒木雄一郎, 末光眞希, 伊藤 隆, 成田 克, 遠藤哲郎, 中澤日出樹, 高田雅介, 安井寛治, 赤羽正志

    電子情報通信学会技術研究報告 (電子部品・材料研究会)　107　(325)　55-58　2007/11/16

  72. Ru コートWを用いた Hot-mesh CVD法によるGaN膜成長 Peer-reviewed

    深田祐介, 小前泰彰, 黒木雄一郎, 末光眞希, 伊藤隆, 成田克, 遠藤哲郎, 中澤日出樹, 高田雅介, 安井寛治, 赤羽正志

    電子情報通信学会2007ソサイエティ大会　エレクトロニクス講演論文集2　(C-6-9)　17　2007/09/11

    ISSN： 1349-1369

  73. ルテニウム担持したタングステンHot-mesh CVD法によるGaN成長 Peer-reviewed

    深田祐介, 小前泰彰, 黒木雄一郎, 末光眞希, 伊藤 隆, 成田克, 遠藤哲郎, 中澤日出樹, 高田雅介, 安井寛治, 赤羽正志

    第４回Cat-CVD研究会　53-56　2007/06/29

  74. In situ Raman spectroelectrochemistry of azobenzene monolayers on glassy carbon Invited Peer-reviewed

    Takashi Itoh, Richard L. McCreery

    ANALYTICAL AND BIOANALYTICAL CHEMISTRY　388　(1)　131-134　2007/05

    DOI： 10.1007/s00216-007-1192-4 　

    ISSN： 1618-2642

  75. 50.Effects of Threshold Voltage Fluctuations on Stability of MOS Current Mode Logic Inverter Circuit Peer-reviewed

    Kazuhiro Suzuki, Hyoung-jun Na, Yuzuru Narita, Hideki, Nakazawa, Takashi Itoh, Kanji Yasui, Maki Suemitsu, Tetsuo Endoh

    IEEE, IMFEDK2007 technical digest　B-7　2007/04

  76. Electrochemical investigations of Al-carbon hybrid bipolar plate materials for polymer electrolyte fuel cells Peer-reviewed

    Dongzhu Yin, Takashi Itoh, Kazumasa Toki, Atsuo Kasuya, Muneyoshi Yamada, Tatsuo Uchida

    ELECTROCHEMISTRY　75　(2)　187-189　2007/02

    DOI： 10.5796/electrochemistry.75.187 　

    ISSN： 1344-3542

  77. ホットメッシュCVD法によるGaN成長---ルテニウムコーティッドタングステンメッシュの効果 Peer-reviewed

    深田祐介, 安部和貴, 黒木雄一郎, 末光眞希, 伊藤 隆, 成田 克, 遠藤哲郎, 中澤日出樹, 高田雅介, 安井寛治, 赤羽正志

    信学技報　107　(325)　55-58　2007

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    Gallium nitride (GaN) is wide-bandgap compound semiconductor, which is useful for optoelectronic devices operating in short wavelength and at high temperatures. In our previous study, hot-mesh CVD method using heated tungsten (W) with a mesh structure was investigated for the growth of hexagonal GaN on AlN/SiC/Si substrates. The GaN films grown at the hot-mesh temperature of 1200℃ showed good crystallinity and a strong near-band-edge emission. In order to lower the mesh temperature during the growth, the GaN films on AlN/SiC/Si substrates using Ru-coated W hot-mesh was investigated. By using the Ru-coated W hot mesh, the crystallinity and the PL spectrum of GaN films growth of lower than 1100℃ were further improved.

  78. Hydrogen-controlled crystallinity of 3C-SiC film on Si(001) grown with monomethylsilane Peer-reviewed

    Yuzuru Narita, Atsushi Konno, Hideki Nakazawa, Takashi Itoh, Kanji Yasui, Tetsuo Endoh, Maki Suemitsu

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　46　(1-3)　L40-L42　2007/01

    DOI： 10.1143/JJAP.46.L40 　

    ISSN： 0021-4922

  79. Characterization of Pt-based transition metal alloy electrodes for PEFC Peer-reviewed

    M. Uebayashi, Y. Sawada, Y. Sato, T. Itoh, B. Jeyadevan, K. Tohji

    WATER DYNAMICS　898　162-+　2007

    DOI： 10.1063/1.2721271 　

    ISSN： 0094-243X

  80. In Situ FT-IR and Raman Spectroscopies for Electrochemical Interfaces Peer-reviewed

    Takashi Itoh

    Journal of the Surface Science Society of Japan　27　(10)　591-594　2006/10/01

    DOI： 10.1380/jsssj.27.591 　

  81. Phase transformation of unpromoted and promoted Fe catalysts and the formation of carbonaceous compounds during Fischer-Tropsch synthesis reaction Invited Peer-reviewed

    Wensheng Ning, Naoto Koizumi, Hai Chang, Takehisa Mochizuki, Takashi Itoh, Muneyoshi Yamada

    APPLIED CATALYSIS A-GENERAL　312　35-44　2006/09

    DOI： 10.1016/j.apcata.2006.06.025 　

    ISSN： 0926-860X

  82. 燃料電池が作る未来 Invited Peer-reviewed

    伊藤 隆

    まなびの杜　35　6-6　2006/03/31

  83. Deactivation mechanism of NiMo catalyst during the ultra deep hydrodesulfurization of gas oil: Characterization of the spent catalysts by means of temperature programmed oxidation and laser desorption/ionization-time of flight mass spectroscopy

    Naoto Koizumi, Yoshihisa Urabe, Hikotaro Suzuki, Takashi Itoh, Muneyoshi Yamada

    ACS National Meeting Book of Abstracts　232　2006

    ISSN： 0065-7727

  84. Low-temperature heteroepitaxial growth of 3C-SiC(111) on Si(110) substrate using monomethylsilane Peer-reviewed

    Atsushi Konno, Yuzuru Narita, Takashi Ito, Kanji Yasui, Hideki Nakazawa, Tetsuo Endoh, Maki Suemitsu

    ECS Transactions　3　(5)　449-455　2006

    DOI： 10.1149/1.2357236 　

    ISSN： 1938-5862 1938-6737

    eISSN： 1938-6737

  85. In situ surface-enhanced Raman scattering spectroelectrochemistry of oxygen species Invited Peer-reviewed

    T Itoh, T Maeda, A Kasuya

    FARADAY DISCUSSIONS　132　95-109　2006

    DOI： 10.1039/b506197k 　

    ISSN： 1364-5498

  86. Synthesis of new electron-doped cuprates LixSr2CuO2X2 (X = Cl, Br) Invited Peer-reviewed

    T Kajita, M Kato, T Suzuki, T Itoh, T Noji, Y Koike

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS　426　500-504　2005/10

    DOI： 10.1016/j.physc.2005.01.039 　

    ISSN： 0921-4534

  87. Investigation of carbonaceous compounds deposited on NiMo catalyst used for ultra-deep hydrodesulfurization of gas oil by means of temperature-programmed oxidation and Raman spectroscopy Peer-reviewed

    N Koizumi, Y Urabe, K Inamura, T Itoh, M Yamada

    CATALYSIS TODAY　106　(1-4)　211-218　2005/10

    DOI： 10.1016/j.cattod.2005.07.172 　

    ISSN： 0920-5861

  88. 固体高分子型燃料電池が作るエネルギー社会 Invited Peer-reviewed

    伊藤 隆, 望月剛久

    表面科学　2005　(6)　362-366　2005/06/01

    Publisher: The Surface Science Society of Japan

    DOI： 10.1380/jsssj.26.362 　

    ISSN： 0388-5321

    More details Close

    Polymer Electrolyte Fuel Cells (PEFCs) are one of the possible energy sources for the near future energy systems. The advantages of PEFC power generation are one of the most effective energy conversion systems and gentle in our environment. In addition, PEFC attracts huge interests as power supply systems for portable electric devices, residential power generation systems and electric vehicles. This article introduces here the comparison of several different types of Fuel Cells, their mechanisms and up-to-date research and developing stages for PEFC.

  89. Photoelectrochemical oxygen evolution using polysulfide as sacrificial electron acceptor Peer-reviewed

    G Milczarek, A Kasuya, K Tohji, T Arai, T Ito

    SOLAR ENERGY MATERIALS AND SOLAR CELLS　86　(1)　43-52　2005/02

    DOI： 10.1016/j.solmat.2004.06.004 　

    ISSN： 0927-0248

  90. New electron-doped superconducting cuprate LixSr2CuO2Br2 Peer-reviewed

    T Kajita, M Kato, T Suzuki, T Itoh, T Noji, Y Koike

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　43　(11B)　L1480-L1481　2004/11

    DOI： 10.1143/JJAP.43.L1480 　

    ISSN： 0021-4922

  91. Raman spectro-electrochemistry of LiCoxMn2-xO4 thin film electrodes for 5 V lithium batteries Peer-reviewed

    K Dokko, N Anzue, M Mohamedi, T Itoh, Uchida, I

    ELECTROCHEMISTRY COMMUNICATIONS　6　(4)　384-388　2004/04

    DOI： 10.1016/j.elecom.2004.02.005 　

    ISSN： 1388-2481

  92. In situ Raman spectroelectrochemistry of oxygen species on gold electrodes in high temperature molten carbonate melts Peer-reviewed

    T Itoh, K Abe, K Dokko, M Mohamedi, Uchida, I, A Kasuya

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　151　(12)　A2042-A2046　2004

    DOI： 10.1149/1.1812735 　

    ISSN： 0013-4651

  93. Impedance spectroscopic characterization of polymer lithium-ion battery at elevated temperatures in accelerated rate calorimeter (ARC) Peer-reviewed

    H Ishikawa, M Mohamedi, T Itoh, Uchida, I

    ELECTROCHEMISTRY　71　(12)　1030-1032　2003/12

    ISSN： 1344-3542

  94. Fabrication of thin film electrodes of LiMxMn2-xO4 (M = Ni, Co) for 5 volt lithium batteries Peer-reviewed

    K Dokko, N Anzue, Y Makino, M Mohamedi, T Itoh, M Umeda, Uchida, I

    ELECTROCHEMISTRY　71　(12)　1061-1063　2003/12

    ISSN： 1344-3542

  95. In situ assessment of LiMn2O4 degradation during prolonged exposure in carbonate-based electrolytes Peer-reviewed

    M Mohamedi, N Anzue, K Dokko, T Itoh, Uchida, I

    ELECTROCHEMISTRY　71　(12)　1168-1171　2003/12

    ISSN： 1344-3542

  96. Influence of oxygen on luminescence and vibrational spectra of Mg-doped GaN Peer-reviewed

    Y Koide, DE Walker, BD White, LJ Brillson, T Itoh, RL McCreery, M Murakami, S Kamiyama, H Amano, Akasaki, I

    PHYSICA STATUS SOLIDI B-BASIC RESEARCH　240　(2)　356-359　2003/11

    DOI： 10.1002/pssb.200303279 　

    ISSN： 0370-1972

  97. Temperature effect on methanol and ethanol electrooxidation at Pt/C and Pt-Ru/C microporous electrodes Peer-reviewed

    CG Lee, T Itoh, M Mohamedi, M Umeda, Uchida, I, HC Lima

    ELECTROCHEMISTRY　71　(7)　549-554　2003/07

    ISSN： 1344-3542

  98. In situ Raman spectroscopic study of thin-film Li1-xMn2O4 electrodes Peer-reviewed

    N Anzue, T Itoh, M Mohamedi, M Umeda, Uchida, I

    SOLID STATE IONICS　156　(3)　301-307　2003/01

    DOI： 10.1016/S0167-2738(02)00693-8 　

    ISSN： 0167-2738

  99. Porous micro-ring electrode - Preparation and investigation of methanol oxidation Peer-reviewed

    Y Hatakeyama, M Umeda, M Mohamedi, T Itoh, Uchida, I

    ELECTROCHEMISTRY　70　(12)　964-965　2002/12

    ISSN： 1344-3542

  100. Electrochemical investigation of LiNi0.5Mn1.5O4 thin film intercalation electrodes Peer-reviewed

    M Mohamedi, A Makino, K Dokko, T Itoh, Uchida, I

    ELECTROCHIMICA ACTA　48　(1)　79-84　2002/11

    DOI： 10.1016/S0013-4686(02)00554-6 　

    ISSN： 0013-4686

  101. In situ Raman spectroelectrochemistry of electron transfer between glassy carbon and a chemisorbed nitroazobenzene monolayer Peer-reviewed

    T Itoh, RL McCreery

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY　124　(36)　10894-10902　2002/09

    DOI： 10.1021/ja020398u 　

    ISSN： 0002-7863

  102. A mechanism for conductance switching in carbon-based molecular electronic junctions Peer-reviewed

    AO Solak, S Ranganathan, T Itoh, RL McCreery

    ELECTROCHEMICAL AND SOLID STATE LETTERS　5　(8)　E43-E46　2002/08

    DOI： 10.1149/1.1490716 　

    ISSN： 1099-0062

  103. Electrochemical stability of thin film LiMn2O4 cathode in organic electrolyte solutions with different compositions at 55 degrees C Peer-reviewed

    M Mohamedi, D Takahashi, T Itoh, Uchida, I

    ELECTROCHIMICA ACTA　47　(21)　3483-3489　2002/08

    DOI： 10.1016/S0013-4686(02)00285-2 　

    ISSN： 0013-4686

  104. Cyclic voltammetry and AC impedance of MmNi3.55Co0.75Mn0.4Al0.3 alloy single-particle electrode for rechargeable Ni/MH battery Peer-reviewed

    M. Mohamedi, T. Sato, T. Itoh, M. Umeda, I. Uchida

    Journal of the Electrochemical Society　149　(8)　A983-A987　2002/08

    DOI： 10.1149/1.1488646 　

    ISSN： 0013-4651

  105. Impedance characterization of hydrogen adsorption-absorption into an Mg2Ni alloy single particle electrode Peer-reviewed

    M Mohamedi, T Sato, T Itoh, M Umeda, Uchida, I

    JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS　5　(3)　197-202　2002/07

    ISSN： 1480-2422

  106. Microvoltammetric study of electrochemical properties of a single spherical nickel hydroxide particle Peer-reviewed

    HS Kim, T Itoh, M Nishizawa, M Mohamedi, M Umeda, Uchida, I

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　27　(3)　295-300　2002/03

    DOI： 10.1016/S0360-3199(01)00118-5 　

    ISSN： 0360-3199

  107. Rapid evaluation of charge/discharge properties for lithium manganese oxide particles at elevated temperatures Peer-reviewed

    K Dokko, S Horikoshi, T Itoh, M Nishizawa, T Abe, M Umeda, Uchida, I

    JOURNAL OF SOLID STATE ELECTROCHEMISTRY　6　(3)　188-193　2002/03

    DOI： 10.1007/s100080100216 　

    ISSN： 1432-8488

  108. ESD fabricated thin films of spinel LiMn2O4 for lithium microbatteries - I. Effects of thickness Peer-reviewed

    M Mohamedi, D Takahashi, T Itoh, M Umeda, Uchida, I

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　149　(1)　A19-A25　2002/01

    DOI： 10.1149/1.1424285 　

    ISSN： 0013-4651

  109. In situ Raman spectroscopic studies of LiNixMn2-xO4 thin film cathode materials for lithium ion secondary batteries Peer-reviewed

    K Dokko, M Mohamedi, N Anzue, T Itoh, Uchida, I

    JOURNAL OF MATERIALS CHEMISTRY　12　(12)　3688-3693　2002

    DOI： 10.1039/b206764a 　

    ISSN： 0959-9428

  110. Explicit study on the oxidation mechanism of nickel in molten Li2CO3-K2CO3 Peer-reviewed

    M Mohamedi, Y Hisamitsu, T Kudo, T Itoh, Uchida, I

    JOURNAL OF SOLID STATE ELECTROCHEMISTRY　5　(7-8)　538-545　2001/10

    DOI： 10.1007/s100080000180 　

    ISSN： 1432-8488

  111. Xerographic and electroabsorption study of primary photocarrier generation process in x-form metal-free phthalocyanine Peer-reviewed

    M Umeda, M Mohamedi, T Itoh, Uchida, I

    JOURNAL OF APPLIED PHYSICS　90　(8)　3984-3987　2001/10

    DOI： 10.1063/1.1403674 　

    ISSN： 0021-8979

  112. Methanol gas sensing using ultramicroelectrodes: studies on sensing mechanism and its enhancement Peer-reviewed

    M Umeda, A Kabasawa, M Kokubo, M Mohamedi, T Itoh, Uchida, I

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　40　(8)　5141-5144　2001/08

    DOI： 10.1143/JJAP.40.5141 　

    ISSN： 0021-4922

  113. In situ SERS spectroscopy of Ag-modified pyrolytic graphite in organic electrolytes Peer-reviewed

    T Itoh, K Abe, M Mohamedi, M Nishizawa, Uchida, I

    JOURNAL OF SOLID STATE ELECTROCHEMISTRY　5　(5)　328-333　2001/07

    DOI： 10.1007/s100080000139 　

    ISSN： 1432-8488

  114. Recent investigations on thin films and single particles of transition metal oxides for lithium batteries Peer-reviewed

    Uchida, I, M Mohamedi, K Dokko, M Nishizawa, T Itoh, M Umeda

    JOURNAL OF POWER SOURCES　97-8　518-524　2001/07

    DOI： 10.1016/S0378-7753(01)00724-8 　

    ISSN： 0378-7753

  115. Gas phase hydrogen electrooxidation using an integrated ultramicroelectrode Peer-reviewed

    M Umeda, K Dokko, M Mohamedi, T Itoh, Uchida, I

    CHEMISTRY LETTERS　(6)　508-509　2001/06

    DOI： 10.1246/cl.2001.508 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  116. Kinetic characterization of single particles of LiCoO2 by AC impedance and potential step methods Peer-reviewed

    K Dokko, M Mohamedi, Y Fujita, T Itoh, M Nishizawa, M Umeda, Uchida, I

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　148　(5)　A422-A426　2001/05

    DOI： 10.1149/1.1359197 　

    ISSN： 0013-4651

  117. Explicit analysis of impedance spectra related to thin films of spinel LiMn2O4 Peer-reviewed

    M Mohamedi, D Takahashi, T Uchiyama, T Itoh, M Nishizawa, Uchida, I

    JOURNAL OF POWER SOURCES　93　(1-2)　93-103　2001/02

    DOI： 10.1016/S0378-7753(00)00551-6 　

    ISSN： 0378-7753

    eISSN： 1873-2755

  118. Ni-Al alloy as alternative cathode for molten carbonate fuel cells Peer-reviewed

    M Mohamedi, Y Hisamitsu, K Kihara, T Kudo, T Itoh, Uchida, I

    JOURNAL OF ALLOYS AND COMPOUNDS　315　(1-2)　224-233　2001/02

    DOI： 10.1016/S0925-8388(00)01278-0 　

    ISSN： 0925-8388

  119. Solubility of NiO as cathode material for MCFC in alkali carbonate melts Peer-reviewed

    M Mohamedi, Q Yu, K Kihara, Y Hisamitsu, T Kudo, T Itoh, M Umeda, Uchida, I, Selman, JR

    PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON MOLTEN SALT CHEMISTRY AND TECHNOLOGY　6　(2001)　235-240　2001

  120. Amorphous tin oxide films: preparation and characterization as an anode active material for lithium ion batteries Peer-reviewed

    M Mohamedi, SJ Lee, D Takahashi, M Nishizawa, T Itoh, Uchida, I

    ELECTROCHIMICA ACTA　46　(8)　1161-1168　2001/01

    DOI： 10.1016/S0013-4686(00)00702-7 　

    ISSN： 0013-4686

  121. Effect of molten carbonate composition on oxygen reduction under pressurized conditions: cyclic voltammetry and equivalent circuit analysis Peer-reviewed

    M Mohamedi, Y Hisamitsu, Y Ono, T Itoh, Uchida, I

    JOURNAL OF APPLIED ELECTROCHEMISTRY　30　(12)　1397-1404　2000/12

    DOI： 10.1023/A:1026539032082 　

    ISSN： 0021-891X

  122. Spectroelectrochemical studies on highly polarized LiCoO2 electrode in organic solutions Peer-reviewed

    T Itoh, N Anzue, M Mohamedi, Y Hisamitsu, M Umeda, Uchida, I

    ELECTROCHEMISTRY COMMUNICATIONS　2　(11)　743-748　2000/11

    DOI： 10.1016/S1388-2481(00)00112-0 　

    ISSN： 1388-2481

  123. Microvoltammetry of lithium nickel oxide single particle: deterioration of the redox behavior by water molecules Peer-reviewed

    K Dokko, M Umeda, T Itoh, Uchida, I

    ELECTROCHEMISTRY COMMUNICATIONS　2　(10)　717-719　2000/10

    DOI： 10.1016/S1388-2481(00)00110-7 　

    ISSN： 1388-2481

  124. Microvoltammetry for cathode materials at elevated temperatures: electrochemical stability of single particles Peer-reviewed

    K Dokko, S Horikoshi, T Itoh, M Nishizawa, M Mohamedi, Uchida, I

    JOURNAL OF POWER SOURCES　90　(1)　109-115　2000/09

    DOI： 10.1016/S0378-7753(00)00456-0 　

    ISSN： 0378-7753

    eISSN： 1873-2755

  125. Electric-field dependent redox electron transfer in an organic solid: study of carrier photogeneration efficiency Peer-reviewed

    M Umeda, M Nishizawa, T Itoh, Selman, JR, Uchida, I

    CHEMICAL PHYSICS LETTERS　326　(3-4)　219-224　2000/08

    DOI： 10.1016/S0009-2614(00)00766-1 　

    ISSN： 0009-2614

    eISSN： 1873-4448

  126. Electrochemical quartz crystal microbalance investigations of LiMn2O4 thin films at elevated temperatures Peer-reviewed

    T Uchiyama, M Nishizawa, T Itoh, Uchida, I

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　147　(6)　2057-2060　2000/06

    DOI： 10.1149/1.1393485 　

    ISSN： 0013-4651

  127. Electrochemical in-situ conductivity measurements for thin film of Li1-xMn2O4 spinel Peer-reviewed

    M Nishizawa, T Ise, H Koshika, T Itoh, Uchida, I

    CHEMISTRY OF MATERIALS　12　(5)　1367-1371　2000/05

    DOI： 10.1021/cm990696z 　

    ISSN： 0897-4756

  128. In situ observation of LiNiO2 single-particle fracture during Li-ion extraction and insertion Peer-reviewed

    K Dokko, M Nishizawa, S Horikoshi, T Itoh, M Mohamedi, Uchida, I

    ELECTROCHEMICAL AND SOLID STATE LETTERS　3　(3)　125-127　2000/03

    DOI： 10.1149/1.1390977 　

    ISSN： 1099-0062

  129. High-Speed voltammetry of Mn-doped LiCoO2 using a microelectrode technique Peer-reviewed

    S Waki, K Dokko, T Itoh, M Nishizawa, T Abe, Uchida, I

    JOURNAL OF SOLID STATE ELECTROCHEMISTRY　4　(4)　205-209　2000/03

    DOI： 10.1007/s100080050196 　

    ISSN： 1432-8488

  130. Influence of adsorption phenomena upon the mechanism and kinetics of oxygen reduction at a gold electrode in (Li-Na)CO3 melt Peer-reviewed

    M Mohamedi, Y Hisamitsu, Y Ono, T Itoh, Uchida, I

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　147　(2)　490-495　2000/02

    DOI： 10.1149/1.1393222 　

    ISSN： 0013-4651

  131. EQCM investigations of LiMn2O4 thin films at elevated temperatures Peer-reviewed

    T Uchiyama, M Nishizawa, T Itoh, Uchida, I

    INTERCALATION COMPOUNDS FOR BATTERY MATERIALS, PROCEEDINGS　99　(24)　160-173　2000

  132. Chronoamperometric studies of LiCoO2 and LiNiO2 particles during lithium-ion insertion/extraction

    K Dokko, S Horikoshi, M Nishizawa, T Itoh, T Abe, Uchida, I

    LITHIUM BATTERIES, PROCEEDINGS　99　(25)　290-297　2000

  133. High temperature in situ Raman spectroscopy of oxide species in molten (Li + K) carbonate eutectic Peer-reviewed

    T Itoh, K Abe, Y Hisamitsu, M Mohamedi, M Nishizawa, T Abe, P Tomczyk, Uchida, I

    CHEMISTRY LETTERS　(10)　1115-1116　1999/10

    DOI： 10.1246/cl.1999.1115 　

    ISSN： 0366-7022

    eISSN： 1348-0715

  134. In situ conductance measurement to investigate roles of conductive additives in lithium ion battery electrodes Peer-reviewed

    M Nishizawa, H Koshika, T Itoh, M Mohamedi, T Abe, Uchida, I

    ELECTROCHEMISTRY COMMUNICATIONS　1　(9)　375-378　1999/09

    ISSN： 1388-2481

  135. Electrochemical quartz crystal microbalance for insertion/extraction of lithium in spinel LiMn2O4 thin films Peer-reviewed

    M Nishizawa, T Uchiyama, T Itoh, T Abe, Uchida, I

    LANGMUIR　15　(15)　4949-4951　1999/07

    DOI： 10.1021/la990270z 　

    ISSN： 0743-7463

  136. Microvoltammetric study of electrochemical hydrogenation of a surface-treated Mg2Ni alloy single particle Peer-reviewed

    HS Kim, M Nisizawa, T Itoh, Uchida, I

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN　72　(7)　1643-1646　1999/07

    DOI： 10.1246/bcsj.72.1643 　

    ISSN： 0009-2673

    eISSN： 1348-0634

  137. Ion- and electron-transport properties of a single particle of disordered carbon during the lithium insertion reaction Peer-reviewed

    M Nishizawa, H Koshika, R Hashitani, T Itoh, T Abe, Uchida, I

    JOURNAL OF PHYSICAL CHEMISTRY B　103　(24)　4933-4936　1999/06

    DOI： 10.1021/jp990604t 　

    ISSN： 1089-5647

  138. Convolution voltammetry applied for the diagnosis of adsorption phenomena during the oxygen reduction in alkali carbonate eutectic Peer-reviewed

    M Mohamedi, Y Hisamitsu, Y Ono, T Itoh, Uchida, I

    CARBONATE FUEL CELL TECHNOLOGY　99　(20)　242-252　1999

  139. Cathodic performance of in situ oxidized Ni+Al alloys in molten Li plus Na carbonate eutectic Peer-reviewed

    Y Hisamitsu, Y Ono, M Mohamedi, T Itoh, T Kudo, P Tomczyk, Uchida, I

    CARBONATE FUEL CELL TECHNOLOGY　99　(20)　337-346　1999

  140. In situ Raman spectroscopic investigations of oxide chemistry in molten carbonates Peer-reviewed

    T Itoh, K Abe, Y Hisamitsu, M Mohamedi, Uchida, I

    CARBONATE FUEL CELL TECHNOLOGY　99　(20)　212-218　1999

  141. Electrochemical insertion behavior of lithium ions into mesophase pitch carbon films prepared by electrostatic spray deposition Peer-reviewed

    SJ Lee, T Itoh, M Nishizawa, K Yamada, Uchida, I

    DENKI KAGAKU　66　(12)　1276-1280　1998/12

    ISSN： 0366-9297

  142. Irreversible conductivity change of Li1-xCoO2 on electrochemical lithium insertion/extraction, desirable for battery applications Peer-reviewed

    M Nishizawa, S Yamamura, T Itoh, Uchida, I

    CHEMICAL COMMUNICATIONS　(16)　1631-1632　1998/08

    DOI： 10.1039/a802962h 　

    ISSN： 1359-7345

  143. Measurements of chemical diffusion coefficient of lithium ion in graphitized mesocarbon microbeads using a microelectrode Peer-reviewed

    M Nishizawa, R Hashitani, T Itoh, T Matsue, Uchida, I

    ELECTROCHEMICAL AND SOLID STATE LETTERS　1　(1)　10-12　1998/07

    ISSN： 1099-0062

  144. In situ SERS study of water molecules on silver electrodes in alkali-hydroxide solutions Peer-reviewed

    T Itoh, Y Sasaki, T Maeda, C Horie

    SURFACE SCIENCE　389　(1-3)　212-222　1997/11

    DOI： 10.1016/S0039-6028(97)00415-9 　

    ISSN： 0039-6028

  145. In situ Raman spectroscopic study of LixCoO2 electrodes in propylene carbonate solvent systems Peer-reviewed

    T Itoh, H Sato, T Nishina, T Matue, Uchida, I

    JOURNAL OF POWER SOURCES　68　(2)　333-337　1997/10

    DOI： 10.1016/S0378-7753(97)02539-1 　

    ISSN： 0378-7753

  146. Raman microprobe spectroscopic study of interfacial species between Li anD Organic Solvents

    Takashi Itoh, Youko Matsutani, Isamu Uchida

    Denki Kagaku　64　(1)　76-79　1996

    DOI： 10.5796/kogyobutsurikagaku.64.76 　

    ISSN： 1344-3542

  147. Raman microprobe spectroscopic study of interfacial species between Li and organic solvents Peer-reviewed

    T Itoh, Y Matsutani, Uchida, I

    DENKI KAGAKU　64　(1)　76-79　1996/01

    ISSN： 0366-9297

  148. In Situ Raman Microprobe Spectroscopy of Lithium Surface in Organic Solvents Peer-reviewed

    Takashi Itoh, Yoko Matsutani, Isamu Uchida

    Electrochemistry　64　76-79　1996/01

Show all ︎Show first 5

Misc. 13

  1. SiC薄膜を介したSi基板上エピタキシャルグラフェンの形成

    末光眞希, 末光眞希, 宮本優, 半田浩之, 齋藤英司, 今野篤史, 成田克, 吹留博一, 伊藤隆, 安井寛治, 中澤日出樹, 遠藤哲郎

    表面科学学術講演会講演要旨集　31st　2011

  2. パルスモードホットメッシュCVD法によるGaN成長条件の最適化

    永田 一樹, 里本, 宗一, 片桐, 裕則, 神保, 和夫, 末光, 真希, 遠藤, 哲郎, 伊藤 隆, 中澤, 日出樹, 成田, 克, 安井 寛治

    信学技法Vol. 110, No-261　55-58　2010/10

    Publisher: 電子情報通信学会

  3. Si基板上に成長させたグラフェンの共鳴ラマン分光

    宮本優, 半田浩之, 吹留博一, 伊藤隆, 末光眞希, 末光眞希

    応用物理学関係連合講演会講演予稿集　56th　(1)　2009

  4. 1. Graphene-on-silicon (GOS) technology for formation of high-mobility ultrathin channel layers on Si substrates.

    H. Handa, Y. Miyamoto, E. Saito, H. Fukidome, T. Itoh, M. Suemitsu

    IEICE Technical Reports　109　(16)　39-43　2009

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    With its industrial adaptability, epitaxial graphene, a graphene film formed by UHV annealing of SiC bulk substrates, is attracting recent attention. Still, a growth technique that allows formation of graphene films on Si substrates is strongly demanded when we want to utilize graphene as a post-CMOS material. To this goal, we have developed a growth technique of graphene on Si substrates by using an epitaxial film of 3C-SiC formed by organosilane gas-source MBE and its subsequent surface modification.

  5. Epitaxial growth of III-V nitride semiconductor films by pulse-mode hot-mesh CVD

    KOMAE Yasuaki, SAITOU Takeshi, SUEMITSU Maki, ITO Takashi, ENDOU Tetsuro, NAKAZAWA Hideki, NARITA Yuzuru, TAKATA Masasuke, YASUI Kanji, AKAHANE Tadashi

    IEICE technical report　108　(269)　7-12　2008/10

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Intermittent gas supplies in hot-mesh CVD for the epitaxial growth of gallium nitride (GaN) were investigated for the improvement of its crystallinity and optical properties. Pulse heating of the Ru coated W-mesh during the hot-mesh CVD was also tried for the enhancement of the high-density NHx supply. As a result, the good crystallinity of GaN films was obtained by intermittent gas supply of TMG and a continuous supply of NH_3 gas compared with other intermittent gas supplies. The pulse heating of W-mesh did not result in the improvement of the film quality of GaN.

  6. Cat-CVD法による窒化物半導体の成長

    安井寛治, 田村和之, 深田祐介, 黒木雄一郎, 末光眞希, 伊藤隆, 成田克, 遠藤哲郎, 中澤日出樹, 高田雅介, 赤羽正志

    応用物理学関係連合講演会講演予稿集　54th　(2)　2007

  7. Hot-mesh CVD法を用いたSiC/Si(111)上へのGaN成長~AlNバッファー層の効果~

    深田祐介, 田村和之, 黒木雄一郎, 末光眞希, 伊藤隆, 成田克, 遠藤哲郎, 中澤日出樹, 高田雅介, 安井寛治, 赤羽正志

    応用物理学関係連合講演会講演予稿集　54th　(2)　2007

  8. Band-edge energies and photoelectrochemical properties of n-type AlxGa1-xN and InyGa1-yN alloys

    Katsushi Fujii, Masato Ono, Takashi Ito, Yasuhiro Iwaki, Akira Hirako, Kazuhiro Ohkawa

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY　154　(2)　B175-B179　2007

    DOI： 10.1149/1.2402104 　

    ISSN： 0013-4651

  9. Low-temperature formation of ultrathin SiC films on Si substrates and its application to ubiquitous devices

    SUEMITSU Maki, KONNO Atsushi, NARITA Yuzuru, ITOH Takashi, YASUI Kanji, NAKAZAWA Hideki, ENDOH Tetsuo

    2006　(15)　45-48　2006/10/03

  10. 28aPS-94 Search for new superconductors in tungsten oxides with layered perovskite structures by a Li-intercalation

    Kajita T, Kato M, Itoh T, Koike Y

    Meeting abstracts of the Physical Society of Japan　59　(1)　577-577　2004/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  11. Trial of Li-doping into boron-cluster materials by the electrochemical method

    Suzuki T., Kato M., Itoh T., Koike Y.

    Meeting abstracts of the Physical Society of Japan　58　(2)　533-533　2003/08/15

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  12. Search for new superconductors in Li-intercalated niobates and tantalates with a layered perovskite structure

    Kajita T., Kato M., Itoh T., Koike Y.

    Meeting abstracts of the Physical Society of Japan　58　(2)　526-526　2003/08/15

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  13. Electrochemical Insertion Behavior of Lithium Ions into Mesophase Pitch Carbon Films Prepared by Electrostatic Spray Deposition

    LEE Seo-Jae, ITOH Takashi, NISHIZAWA Matsuhiko, YAMADA Kohta, UCHIDA Isamu

    Electrochemistry　66　(12)　1276-1280　1998/12/05

    Publisher: 電気化学会

    ISSN： 1344-3542

Show all ︎Show first 5

Books and Other Publications 16

  1. ラマン分光スペクトルデータ解析事例集

    伊藤 隆

    技術情報協会　2022/02

  2. 電気化学・インピーダンス測定のデータ解析手法と事例集

    ITOH Takashi

    技術情報協会　2018/12

  3. Lecture Notes in Energy 32, Energy Storage in Batteries and Fuel Cells" in solar to Chemical Energy Conversion; Theory and Application, Part III pp.105-122.

    Tetsuya Kajita, Takashi Itoh

    2016

  4. LiBの高容量・高耐久化のための電極-電解液（質）の界面制御技術と解析・評価法「ラマン分光法－リチウムイオン電池－」第9章第7節(2015) 297-301

    伊藤 隆

    情報技術協会　2015/02

  5. 電気化学/インピーダンス測定のノウハウと正しいデータ解釈「ラマン分光法－リチウムイオン電池－」第3章、第1節[8] (2013) 128-132

    伊藤 隆

    情報技術協会　2013

  6. IR分析「LiCoO2リチウム電池正極材料のラマン分光測定」第20章、第2節 (2013) 760-761

    伊藤 隆

    技術情報協会　2013

  7. IR分析「リチウムイオン電池用負極材料のラマン分光測定」第20章、第3節 (2013)762-763

    伊藤 隆

    技術情報協会　2013

  8. In-situ測定・分析テクニックおよび最新計測「各種測定法のIn-situ測定時のポイント、光散乱法／ラマン分光法によるIn-situ測定方法とポイント」第1章、第7節（2013）60-70

    伊藤 隆

    情報機構　2013

  9. In-situ測定・分析テクニックおよび最新計測「リチウムイオン二次電池構成要素のIn situラマン測定」第3章、第1節（2013）257-264

    伊藤 隆

    情報機構　2013

  10. スマートハウスの発電・蓄電・給電技術の最前線

    伊藤隆

    2011/03/01

  11. 電池ハンドブック

    伊藤隆

    オーム社　2010/02/17

  12. Lithium Batteries, Chronoamperometric studies of LiCoO2 and LiNiO2 particles during lithium-ion insertion/extraction

    Kaoru Dokko, Soichi Horikoshi, Matsuhiko Nishizawa, Takashi Itoh, Takayuki Abe, Isamu Uchida

    Electrochem. Soc., Proc. - Electrochem. Soc. 99-25 (2000), 290-297　2000/01

  13. Intercalation Compounds for Battery Materials, EQCM investigations of LiMn2O4 thin films at elevated temperatures

    Takayuki Uchiyama, Matsuhiko Nishizawa, Takashi Itoh, Isamu Uchida

    Electrochem. Soc., Proc. - Electrochem. Soc. 99-24 (2000), 160-173　2000/01

  14. Carbonate Fuel Cell Technology V, In situ Raman spectroscopic investigations of oxide chemistry in molten carbonates

    Takashi Itoh, Koji Abe, Yasunari Hisamitsu, Mohamed Mohamedi, Isamu Uchida

    Electrochem. Soc., Proc. - Electrochem. Soc., PV 99-20 (1999), 212-218　1999/01

  15. Carbonate Fuel Cell Technology V, Convolution voltammetry applied for the diagnosis of adsorption phenomena during the oxygen reduction in alkali carbonate eutectic

    M. Mohamedi, Y. Hisamitsu, Y. Ono, T. Itoh, I. Uchida

    Electrochem. Soc., Proc. - Electrochem. Soc. 99-20 (1999), 242-252　1999/01

  16. Carbonate Fuel Cell Technology V, Cathodic performance of in situ oxidized Ni+Al alloys in molten Li + Na carbonate eutectic

    Yasunari Hisamitsu, Yu Ono, Mohamed Mohamedi, Takashi Itoh, Takashi Kudo, Piotr Tomczyk, Isamu Uchida

    Electrochem. Soc., Proc. - Electrochem. Soc. 99-20 (1999), 337-346　1999/01

Show all Show first 5

Presentations 45

  1. In Situ Raman Analysis for High Capacity Zinc Anode in Alkaline Solutions (Keynote Lecture) Invited

    Takashi Itoh

    7th International Conference on Functional Materials and Devices (ICFMD2022)　2022/08/25

  2. 化学反応を観る －究極の電池に向けた光分析－ Invited

    Takashi Itoh

    「第136回」産学連携セミナー「寺子屋せんだい」、公益財団法人仙台市産業振興事業団　2019/10/24

  3. In Situ Spectrospectroscopic Study for Zinc Electrodes in Highly Concentrated Alkaline Solutions, Keynote Lecture Invited

    Takashi Itoh

    15th IUPAC International Conference on Novel Materials and their Synthesis (NMS-XV)　2019/09/09

  4. In Situ Raman Analysis for High Capacity Zinc Anode in Alkaline Solutions, Invited Lecture Invited

    Takashi Itoh

    Asia Pacific Society for Materials Research 2019 Annual Meeting　2019/07/27

  5. 再エネ利用における蓄電技術の現状と課題の概要、取組紹介 Invited

    伊藤 隆

    石油学会新エネルギー部会講演会　2019/02/21

  6. In Situ Raman Spectroelectrochemistry for High Capacity Zinc Anode in Alkaline Solutions International-presentation Invited

    14th IUPAC International Conference on Novel Materials and their Synthesis (NMS-XIV)　2018/10/21

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    Takashi Itoh and Azhagurajan Mukkannan

  7. ２次電池によるエネルギー貯蔵 ―リチウム電池から革新電池へー Invited

    伊藤 隆

    2018年 第65回応用物理学会春季学術講演会　2018/03/17

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    伊藤 隆、 ムカンナン アザグラジャン

  8. In Situ SERS Analysis of Water Libration on Silver Electrode in Various Alkali Hydroxide Aqueous Solutions Invited

    IUPAC 13th International Conference on Novel Materials and their Synthesis (NMS-XIII)　2017/10/15

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    Takashi Itoh

  9. 電気化学エネルギー変換デバイスにおける極限電気化学界面の探索ーリチウム２次電池のサイエンスー Invited

    熊本大学 自然科学研究科 特別講演会　2015/12/10

  10. In Situ Surface-enhanced Raman Analysis of Water Libration on Silver Electrode in Various Alkali Hydroxide Aqueous Solutions (Invited Lecture) Invited

    4th International Symposium on Energy Challenges and Mechanics (ECM4) - working on small scales　2015/08/11

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    Takashi Itoh

  11. 電気化学エネルギー変換デバイスにおける極限電気化学界面の探索ーリチウム２次電池のサイエンスー Invited

    第1回RIECENセミナー　2015/08/06

  12. In Situ Raman Spectro-electrochemistry for Cathode Materials in High Voltage Lithium Secondary Batteries (Keynote Lecture) Invited

    IUPAC 10th International Conference on Novel Materials and Synthesis (NMS-X)　2014/10/10

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    Takashi Itoh

  13. 『電気化学エネルギー変換デバイスの現状と未来 ?２次電池と燃料電池ー』 Invited

    RCASTセミナー（公開技術セミナー特別講演）　2014/03/14

  14. In Situ FT-Raman Spectroelectrochemistry for Binder Included Cathode Electrodes in LiPF6 Electrolyte Systems (Keynote Lecture) Invited

    IUPAC 9th International Conference on Novel Materials and Synthesis (NMS-IX)　2013/10/17

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    Takashi Itoh

  15. In Situ FT-Raman Spectroelectrochemistry for Lithium Ion Battery Cathode Invited

    IUPAC 8th International Conference on Novel Materials and Synthesis & 22nd International Symposium on Fine Chemistry and Functional Polymers　2012/10/14

  16. ２次電池・燃料電池の評価方法と今後の研究開発動向 Invited

    ホンダ東陽テクニカKEISOKU Tec. 2012　2012/08/22

  17. その場ラマン分光法を用いた高エネルギー電極反応の探索 Invited

    サーモフィッシャーサイエンティフィック株式会社ユーザーズフォーラム2012　2012/06/08

  18. リチウムイオン二次電池の研究最前線 Invited

    東陽ソリューションフェア2011　2011/11/02

  19. 2次電池の信頼性評価技術 Invited

    東京大学ITSセミナーin仙台　2011/10/24

  20. In Situ FT Raman Spectroelectrochemistry on Highly Polarized Cathode Materials for Lithium Ion Batteries Invited

    IUPAC 7th International Conference on Novel Materials and Synthesis (NMS-VII) & 21st International Symposium on Fine Chemistry and Functional Polymers (FCFP-XXI)　2011/10/16

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    Takashi Itoh

  21. 固体高分子形燃料電池の高性能化と低コスト化−ハイブリッドセパレータとFePt触媒からのアプローチ− Invited

    石油学会東北支部講演会　2010/11/18

  22. 電気化学エネルギー変換デバイスの最先端−燃料電池と２次電池 Invited

    みやぎ高度電子機械産業振興協議会 エネルギーデバイス市場・技術研究会　2010/10/22

  23. In Situ Spectro-Electrochemistry for Energy Conversion Interface Invited

    Sony Electronics Singapore Company Invited Lecture　2010/09/21

  24. In Situ Raman Spectroelectrochemistry on Highly Polarized Cathode Materials for Lithium Ion Batteries Invited

    5th Asian Conference on Electrochemical Power Sources　2010/09/17

  25. リチウム二次電池の電極反応 Invited

    2010年秋季応用物理学会学術講演会　2010/09/15

  26. 電極材料の過剰な負荷条件下におけるその場振動分光 Invited

    日本金属学会分科会シンポジウム　2010/07/29

  27. 二次電池の信頼性評価技術ー電気化学エネルギー変換デバイスのサイエンスー Invited

    第１回次世代移動体システム研究報告会　2010/03/12

  28. 電極材料の過剰な負荷条件下におけるその場振動分光解析 Invited

    第24回JFCAテクノフェスタ　2010/01/25

  29. 「電気化学エネルギー変換デバイスの最先端 −燃料電池と２次電池− Invited

    NPO法人環境エネルギー技術研究所第2回SFTEEセミナーDC利用技術の最先端　2009/11/27

  30. In Situ Raman Spectroelectrochemistry for Energy Conversion Interfaces Invited

    5th IUPAC International Symposium on Novel Materials and Synthesis (NMS-V) & 19th International Symposium on Fine Chemistry and Functional Polymers (FCFP-XIX) & 3rd Symposium on Power Sources for Energy Storage and their Key Materials (PS-III: Internation　2009/10/18

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    Takashi Itoh

  31. 燃料電池用Fe-Pt電極触媒ナノ粒子の特性評価 Invited

    社団法人未踏科学技術協会ナノ粒子研究会第45回公開講演会　2008/12/17

  32. In Situ Raman Photo-electrochemistry for GaN electrodes in aqueous solutions Invited

    University of California Santa Barbara Special Semiar　2008/05/23

  33. 電気化学エネルギー変換デバイス材料のその場ラマン分光 Invited

    日本金属学会2008年春期講演大会　2008/03/26

  34. In Situ Raman Spectroelectrochemistry for Energy Conversion Interfaces Invited

    Chemistry Department Special Seminar, University of California Riverside　2008/02/19

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    Takashi Itoh

  35. In Situ SERS Spectroelectrochemistry of Oxide Chemistry at Energy Conversion Interfaces Invited

    35th International Conference on Spectroscopy, Colloquium Spectroscopicum Internationale XXXV　2007/09/23

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    Takashi Itoh

  36. 水素発生のための光電気化学反応のその場観察 Invited

    第６８回応用物理学会学術講演会シンポジウム”光と半導体による新しいエネルギー生成と環境浄化”　2007/09/04

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    伊藤 隆，藤井克司，八百隆文

  37. その場赤外・ラマン分光法による電極表面解析 Invited

    表面科学会 第26回表面科学講演大会　2006/11/06

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    伊藤 隆

  38. In situ Raman spectroelectrochemicstry for energy conversion interfaces Invited

    56the Annual Meeting of the International Society of Electrochemistry　2005/09/25

  39. 高エネルギー界面のスペクトロエレクトロケミストリー Invited

    平成17年度 化学系学協会東北大会　2005/09/23

  40. In Situ Surface-Enhanced Raman Scattering Spectroelectrochemistry of Oxygen Species Invited

    Faraday Discussions　2005/09/19

  41. ナノ構造エネルギー変換デバイスとラマン分光 Invited

    第35回マテリアルズ・テーラリング研究会プログラム　2003/07/31

  42. エネルギー変換デバイスのその場ラマン分光と電気化学測定に関する研究 Invited

    社団法人 電気化学会 創立70周年記念大会　2003/04/01

  43. In Situ Raman Spectroelectrochemistry for Battery Active Materials Invited

    1st Sino-Japan Seminar on Advanced Battery Materials　2002/10/07

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    Takashi Itoh, Mohamed Mohamedi and Isamu Uchida

  44. In Situ Raman Spectroscopy for Lithium ion batteries Invited

    4th Chicago Battery Workshop　2000/04/10

  45. In Situ Raman Spectroscopy for Lithium ion batteries Invited

    Battery Conference in Polish Academy of Sciences　1999/10/24

Show all Show first 5

Research Projects 23

  1. 酸化物フリーCuナノワイヤが実現する完全塗布型太陽電池

    横山 俊, 伊藤 隆

    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

    2022/04/01 - 2026/03/31

  2. In situ SERS spectroscopy for organic additives with controlling metal deposition

    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

    2022/04/01 - 2025/03/31

  3. Cuナノワイヤを基軸にした高性能・高耐久な透明導電膜の創製と太陽電池応用

    横山 俊, 伊藤 隆

    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

    2019/04/01 - 2023/03/31

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    銅ナノワイヤを太陽電池の透明導電膜へ応用するため、現在用いられている酸化インジウムスズの性能や耐久性を超えるために研究を進行してきた。現在までに、形状、表面制御によってITOと同等以上の性能発現に成功し、更にAg被覆によって数百時間の耐久性付与に成功している。しかし、実際の太陽電池の透明導電膜として使用するためには、数年から数十年の耐久性を必要とするため、酸化亜鉛によるナノワイヤ被覆による耐久性の向上を検討した。 酸化亜鉛被覆は研究代表者の開発しているアミンヒドロキソ亜鉛錯体の脱水による酸化亜鉛薄膜形成法を展開し、被覆法の開発を行った。アミンヒドロキシ亜鉛は、アンモニア水溶液に酸化亜鉛を溶解し得ることが出来るが、これまでのアンモニア濃度では、ナノワイヤとの反応時にpHが高く、ナノワイヤが劣化するため、アンモニア濃度、亜鉛濃度を制御した結果、アンモニア濃度をアミンヒドロキソ亜鉛錯体を形成可能な範囲で低減し、14.8Mから1M程度まで低減出来た。また、アンモニア濃度の低い場合に形成される酸化亜鉛はこれまで水酸化亜鉛を多く含んでいたが、水酸化亜鉛の比率が低く、質のよい酸化亜鉛を形成可能であることを明らかとして、詳しい機構は解明中である。この溶液条件を用いたところ、ナノワイヤを劣化させずに酸化亜鉛を数nm程度で被覆することに成功した。現在劣化環境下で耐久性を調査中であるが、Ag被覆よりさらに耐久性を付与可能であることが示唆されている。

  4. Development of highly Na storage material with highly amorphous structure by soft chemical synthesis

    Kajita Tetsuya, ITOH Takashi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2016/04/01 - 2018/03/31

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    The aim of this research project is to create a highly amorphized material using soft chemistry method and develop new electrode material group for Na-ion battery. We synthesized highly amorphous Si and Ge oxide powders by soft chemistry method. However, only the amorphous Ge oxide powder showed the electrochemical performance for the Na-ion battery. In the soft chemical synthesis, fine particles of several microns was observed by using 2-propanol, a secondary alcohol, as the alcohol species for oxidizing Zintle phase NaM. Using an ether solvent for the Na-ion battery electrolyte solution, the electrochemical performances of the amorphous Ge oxide material were greatly improved.

  5. In Situ Raman Spectroelectrochemistry for Solvated Molecules at High Energy Interface

    ITOH Takashi

    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

    2015/04/01 - 2018/03/31

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    The electrochemical reaction for battery is elucidated from the spectroscopic viewpoint. The battery quality depends on the solvation or desolvation of activated ion at the high energy interface between electrodes and electrolytes. However, the details about the electrochemical reaction have not been clarified yet. In this study, the vibrational spectroscopic technique of the Raman spectroscopy has been carried out for the battery active materials. Obtained results give big knowledge to the development of the battery industry which needs rapid charging and discharging of lithium ion battery for electric vehicle.

  6. In Situ Visualization of Lithium Ion Intercalation using Differential Optical Microscopy with Atomic Layer Resolution

    ITAYA KINGO, ITOH TAKASHI, YOSHIMOTO SOICHIRO

    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

    2013/04/01 - 2016/03/31

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    Atomic-level visualization of the intercalation of layered materials, such as metal chalcogenides, is of paramount importance in the development of high-performance batteries. In situ images of the dynamic intercalation of Li ions into MoS2 single-crystal electrodes were acquired for the first time, under potential control, with the use of a technique combining laser confocal microscopy with differential interference microscopy.

  7. Frontier Research Institute for Interdisciplinary Sciences

    ITOH Takashi, KAJITA Tetsuya

    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

    2013/04/01 - 2015/03/31

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    In electrochemistry, it is often necessary to conduct both experimental and theoretical investigations, including analysis of the standard electrode potential, the electric double layer, the diffusion layer, the diffusion coefficient of the ion, and thermodynamic parameters. Spectroscopy has progressed remarkably in the last three decades. Advances in spectroscopic analysis have been driven primarily by the need to clarify how surface physical chemistry, such as catalysis and corrosion, are involved in chemical reactions. The present study investigates the behavior of water molecules on the surface of a Ag electrode by Surface-enhanced Raman scattering (SERS) spectroelectrochemistry and focuses on the dynamical changes in the Raman spectra of water libration at the interface between the electrode and the electrolyte solution at various electrode potentials in alkali hydroxide aqueous solutions.

  8. Development of anode of high performance lithium ion capacitors using single-walled carbon nanotube thin films

    SATO Yoshinori, ITOH Takashi, ONEGAWA Satoshi, HATO Yukinori, MIYAGAWA Risa

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Tohoku University

    2011/04/01 - 2014/03/31

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    We investigated the properties of lithium ion capacitors (LICs) using highly crystalline single-walled carbon nanotube (SWCNT) thin films with carboxyl groups as an anode. The decrease of the capacity of LICs was suppressed at a high rate, and also the decrease of the capacitance and the increase of the internal resistance were suppressed at overcharging voltages. If the capacitance of SWCNTs is large, we can fabricate a high performance LICs. In contrast, the properties of the LICs decrease at over-discharging voltages. In the future, we need to clarify phenomena caused in SWCNT electrodes in over-discharging. We synthesized ethylenediaminated SWCNTs (EDA-SWCNTs) from fluorinated SWCNTs and investigated the properties of electric double-layer supercapacitors (EDLSCs) with EDA-SWCNTs as electrodes. Free-standing EDA-SWCNT electrodes for EDLSCs are effective as electrodes and improve the properties of EDLSCs in comparison to binder-free COOH-SWCNT electrodes.

  9. Development of highly crystalline nanoparticles synthesis process for energy andenvironmentalapplications

    B Jeyadevan

    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: The University of Shiga Prefecture

    2010 - 2012

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    Research plan was founded on the basic research to develop techniques to synthesize highly crystalline nanomaterials for energy and environmental related applications. We synthesized highly pure copper oxides（CuO、Cu2O）nanoparticles for photoelectric conversion and confirmed their semi-conductor properties. We also constructed Cu2O:C60solar cells and evaluated their photo efficiency. We also developed techniques to synthesize Fe-Pt and Ni-Pt nanoparticles as catalytic electrodes for fuel cells. We demonstrated that Fe-Pt nanoparticles with fct crystalline structure on activated carbon could be used as an alternative candidate for Pt in PEFCs. Furthermore, Ni95Pt5and Ni90Pt10performed comparably with Pt particles in hydrogenation reaction, in spite of low Pt concentration. Finally, we also developed techniques to synthesize Fe-Co and Fe-Ni particles as electromagnetic wave absorbers and antenna material, respectively, and measured their high frequency properties. Fe-Co exhibited particle size dependent resonance peak in the range of a few GHz. On the other hand, Fe?Ni alloy nanoparticles, synthesized by hydrazine assisted polyol process, exhibited shape dependent low magnetic lossinthe MHz region.

  10. Oxide Chemistry for in-situ Electrochemical Raman Spectroscopy

    ITOH Takashi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Tohoku University

    2006 - 2008

  11. 1ナノメータ粒子の精密物性解析と電子的材料機能の開拓

    粕谷 厚生, 伊藤 隆, 前川 英己

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 萌芽研究

    Institution: 東北大学

    2006 - 2008

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    本研究の目的は機能性半導体として有用なII-VI族化合物の一つであるCdSeについて、(CdSe)13、(CdSe)19、(CdSe)33、(CdSe)34、(CdSe)48、等の直径1ナノメートル台の粒子を溶液法で選択的に大量合成し、原子数に依存する物性を詳細に解析することによってバルクでは実現せぬ電子機能を開拓して応用に役立てる萌芽的研究を実施することであった。この分子的ナノ粒子は原子と固体の中間に位置する新しい物質群と見なすことが出来、物質科学と材料工学に未開分野に属する。初年度より以下の実験を実施し、成果をあげた。 1. ナノ粒子の生成過程の解析と単離条件の決定(粕谷、伊藤) 1ナノメータ粒子として(CdSe)13、(CdSe)33、(CdSe)34、(CdSe)48、を単離する条件を見出した。 2. 核磁気共鳴(NMR)によるナノ粒子の構造解析(前川、伊藤) 得られた(CdSe)13、(CdSe)33、(CdSe)34、(CdSe)48、についてNMR測定を行い、(CdSe)13ではCdとSeからの鋭いピークをそれぞれ1本、(CdSe)48では2本観測し、試料が完全に単離されて単一であること、原子配列の対称性が極めて高いことが証明された。 3. 顕微分光によるナノ粒子の物性解析(伊藤、粕谷) 局所的な分光を行うための顕微装置を立ち上げ、それぞれの1ナノメータ粒子の光吸収、発光、ラマン散乱測定を行い、基礎的な電子物性と結合状態を明らかにした。 3. ナノ粒子の電子的、電気化学的特性の評価(伊藤、前川) 次ぎに電気化学測定を行い、1ナノメータ粒子の化学的特性、光電気化学反応、触媒効果、を調べた 4. ナノ粒子の整列薄膜化と集積的電子材料機能の開拓(伊藤、前川、粕谷)更にこれら単離された1ナノメータ粒子を基板上に整列させた薄膜を作製し、互いの相互作用或いは干渉効果による、諸特性の増強、先鋭化、の有無を解析した。 以上の結果を基にして1ナノメータ粒子及び集合体のフォトニックデバイス、光単電子素子、蓄電材料、分子認識センサー、電力変換触媒、等としての特有の性能を評価し、原子数の精度でナノ構造と材料機能を捉える物質科学と材料工学への貢献を総括した。

  12. Chemical Transformation Networks using Ultra-small Particles

    KASUYA Atsuo, ITOH Takashi, TOHJI Kazuyuki, SUTO Syozo, HIGUCHI Hideo, KAWAZOE Yoshiyuki

    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

    2004 - 2006

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    Nanoparticles in 1 nm dimension consisting of tens to thousands of atoms exhibit materials properties sensitively dependent on the number of constituent atoms, in contrast to those over a few nm which are regarded essentially as the bulk. This project investigates two or three dimensional networks of these ultra-small nanoparticles inducing detection, conduction, decomposition, transformation, storage of electrons, atoms, molecules and ions. The research is divided into 1.synthesis of ultra-small particles of high functionalities, 2.linking them into networks, and 3.evaluating their device characteristics. The special attention was focused on producing the smallest particles of practically useful II-VI semiconducting compounds, succeeding in finding atomically precise and perfectly monosized 1 nm particles of (CdSe)_n. The number of constituent atoms is less than a hundred and is small enough that the particle behaves like a molecule to be linked or assembled under atomic scale and precision. They exhibit functional devices realized by and based on the properties arising from special atomic arrangements not achieved by bulk crystalline structures, leading to a new approach in nanometer science and technology. Ultra-small particles of (CdSe)_n were synthesized with n= 13,34,48,60.... Such small particles exhibit their stabilities extremely sensitive to the number of constituent atoms, n, so as to be selectively grown only at these n's. Networks with these particles were produced not only by simple array formation but also by their liking with organic polymers to form two and three dimensional arrangements. These 1nm particles are further functionalized by surface modification with such as trioctylphosphine (TOP) to yield extremely high luminescence efficiency comparable to rhodamines of commercial organic dyes. These functionalities are realized by our atomically precise synthesis and characterization made possible because of their molecular nature, proven as a desirable approach in the nanoscience and technology.

  13. ポーラスシリコンを用いた太陽光動作光触媒素子の開拓

    粕谷 厚生, 須藤 彰三, 伊藤 隆, 香川 昌宏

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 萌芽研究

    Institution: 東北大学

    2003 - 2005

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    本研究では水素原子を終端したシリコン完全結晶表面をポーラスシリコンの理想モデルと見なして単純な平坦面から凸凹なポーラス面に至る試料について順次光電気化学的特性を解析し、光触媒効果を原子的素過程として解明する。即ち光照射によりシリコン内部で励起された電子が表面に吸着する水素と電荷の授受を行い、分子として脱離する過程を電気化学分光、電子分光、赤外分光などの測定技術を駆使して詳細に解析することを目的とした。 初年度に光電気化学セルを作製し、2年度に引き続いて電解液中の電気化学測定と走査トンネル顕微鏡、原子間力顕微鏡測定並びにラマン散乱分光による反応過程のその場観察を行った。また赤外分光、超高真空走査トンネル顕微鏡と高分解能電子エネルギー損失分光の組み合わせ装置により、反応中間体や生成物の同定を試みてきた。 3年次において以下の結果と結論を得た。 1.シリコンは表面を水素で終端することにより、還元電位より卑であれば電機化学的に極めて安定であることがわかった。これにより良質なショットキ障壁が形成される。 2.H+がHに還元される反応では表面を終端する水素は脱離することなく結合し、安定な電極として働くことが重水素をつかった赤外分光測定で明らかになった。 3.更にこの反応において電解液中のHは表面のみならず内部にまで侵入し、表面準位を形成することがわかった。この表面準位が電気化学反応の効率に重要となることがわかった。これに表面の凸凹が加わると表面積を増やすことのみならずに反応活性点も増加し、極めて高効率の電極になることが始めて理解されるに至った。

  14. 電気化学In Situラマン分光法のアゾ化合物を修飾した炭素電極への展開

    伊藤 隆

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究(B)

    Institution: 東北大学

    2002 - 2004

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    当該研究課題は,(1)その場ラマン分光システムをアゾ化合物で修飾したカーボン電極に展開する,(2)アゾ化合物で修飾したカーボン電極を固体高分子型燃料電池の電極材料として用い,その電極特性を検討することを目的としている.研究の初期段階において4-NitoroAzoBenzene等をカーボン電極に修飾することに成功した.研究の第一段階としてその吸着過程をIn Situラマン分光測定を行い,吸着過程の電極電位依存性を解明した.本年度はその手法を幅広い電極,分子種に展開した. 吸着分子種の幅を広げつつ,電極反応過程の詳細なる検討を行った.アセトニトリル中においていて4-NAB,AB(AzoBenzene)等のアゾ化合物のカーボン電極の吸着過程を中心にその場ラマン分光測定を行った.昨年度までの研究成果において,4-NABの吸着過程の分光学的研究を行っており,これまで(a)NABは非常に大きなラマン散乱強度を持つラマンバンドが存在する,(b)カーボン電極へのNABの吸着は比較的強固である,(c)NABは良い電子伝導性をもつなどの実験結果を得ることができている.これを踏まえた吸着過程の電極電位依存性を検討した結果,電極界面における分子の配向,単分子層吸着のメカニズム等を解明することができた.同様な解析手法を展開しつつ,その場ラマン測定の高感度化を試みた結果,高感度化により,幅広い分子種のラマン測定のみならず,多種多様な電気化学反応解析を行うことができた.この実験結果より,電気化学反応の詳細を描くことができたと考えている.

  15. Development of in-situ/ex-situ electrochemical measurement system for polymer electrolyte membrane fuel cells

    UMEDA Minoru, UCHIDA Isamu, KISHIOKA Shinya, YAMADA Akifumi, ITOH Takashi

    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: Nagaoka University of Technology

    2002 - 2003

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    Electrochemical measurement system for polymer electrolyte membrane fuel cells(PEMFCs) has been constructed by developing in-situ and ex-situ electrochemical techniques. Thus far, cell performances of PEMFCs have been evaluated by I-V characteristics of the single cell. The present study has succeeded to establish fundamental methods to measure each material used in the cell properly under the cell-operation environments. Main research results are summarized as follows. First, by developing novel porous-microdisc electrode and porous-microring electrode, electrochemical properties of powder catalyst alone and catalyst/PEM layered structure have been estimated. Second, precise proton conductivity of PEM in thickness direction has become available by employing a set of microelectrodes. When the measured conductivity was compared with that assessed by the current interruption technique, the magnitudes of proton conductivities were well agreed. Third, a new method for alcohol crossover evaluation at a PEM has been attained, utilizing a microdisc electrode based on its micro-positioning feature. This enabled a quantitative crossover analysis at the PEM. Next, redox mechanism of an aromatic alcohol as a new fuel candidate has been investigated according to a spectroelectrochemistry measurement. Finally, ionic conductivity of polymer electrolyte membrane has been resolved employing an interdigitated microarray electrode by changing a water : methanol mixture ratio, which is worthwhile for operating the direct methanol fuel cell(DMFC). In conclusion, by designing in-situ/ex-situ electrochemical measurement system to evaluate the functional materials in the PEMFC, electrochemical study for the materials and the cell systems have been greatly improved.

  16. In Situ Dynamical Study of Mesophase corbon Electrodes by using Raman Scattering Competitive

    2002/04 -

  17. Study of ultramicroelectrode-based-measurement system for polymer electrolyte/electrocatalyst interface

    UCHIDA Isamu, ITOH Takashi, MOHAMED Mohamedi, UMEDA Minoru

    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

    2001 - 2002

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    Electrochemical measurement system for polymer electrolyte membrane/electrocatalyst layered structure, where the three-electrode system was difficult to apply so far, has been constructed by creating a series of ultramicroelectrodes. The system successfully enabled us to evaluate the interfacial electrochemical reaction based on a small-current-induced small iR drop even in the high resistivity medium. In addition, microarray electrode revealed a reaction mechanism of the electrocatalytic process. Consequently, electrochemical measurement system for polymer electrolyte fuel cell (PEFC) has been developed. Main research results are summarized as follows. First, an integrated ultramicroelectrode has been fabricated which involves working, counter and reference microelectrodes at a tip of a glass capillary. By using this, the gas phase electrochemical reactions were measured for hydrogen and methanol oxidation. Second, ionic conductivity of polymer electrolyte membrane has been measured employing an interdigitated microarray electrode by changing a water:methanol mixture ratio. Which is worthwhile for an operation of direct methanol fuel cell (DMFC). Third, by utilizing the interdigitated microarray electrode, methanol oxidation intermediate, which could not recorded at a conventional rotating ring-disk electrode, has been detected for the first time. Next, a porous microelectrode has been made which has a microcavity at the tip to measure electrochemical properties of particulate materials. This allowed a conventional evaluation of electrocatalysts in a powder form. Finally, a porous microring electrode, which has polymer electrolyte/electrocatalyst layered structure at the tip, has been created for a purpose to appraise a membrane electrode assembly (MEA) electrochemically. In conclusion. By designing and fabricating novel ultramicroelectrodes, electrochemical characterization for polymer electrolyte membrane/electrocatalyst structure has been greatly progressed.

  18. 電気化学InSituラマン分光法の高温溶融炭酸塩系への展開

    伊藤 隆

    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

    2000 - 2001

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    (1)溶融炭酸塩へのIn Situラマン分光法の展開を行うため,In Situ測定の可能な高温電気化学セルの作製を行った.さらに,溶融炭酸塩の成分組成の条件出し,ガス雰囲気の決定等を行うための実験を行った.共晶組成であるLi/K=62/38を923Kに加熱し,溶融炭酸塩からのIn Situラマン測定を行った. (2)溶融炭酸塩中における酸素活性種(スーパーオキサイド,パーオキサイド)の同定をおこなうために,外部からKO_2,Li_2O_2等の活性酸素種を含む化合物を溶融炭酸塩に投入した場合のラマンスペクトルの測定にはじめて成功した. (3)共晶組成であるLi/K=62/38を923Kに加熱した溶融炭酸塩のガス組成依存性を検討した.これまでのところ,In Situラマンスペクトルのガス組成依存性はみられなかった. (4)さらに上記のIn Situ測定に加えて,電位規制下における金電極-溶融炭酸塩界面における電気化学反応を,高温In Situラマン分光法にて観察している.これまでのところ,酸素活性種に帰属できるラマン線が観測されている.

  19. In Situ Spectroscopic Study of Metal Electrode Surface in Molten Carbonate Competitive

    2000/04 -

  20. プロチウム材料溶液界面のマイクロACインピーダンス解析と電極過程のモデル化

    伊藤 隆, 梅田 実, 内田 勇

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特定領域研究(A)

    Institution: 東北大学

    2000 - 2000

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    当該研究は,ニッケル水素2次電池への応用を念頭においたプロチウム固溶材料の材料特性評価を行ったものである.マイクロ電極法とACインピーダンス法を組み合わせた電気化学測定は,プロチウム固溶材料(Mm系合金材料,Mg_2Ni,Pd)-電解液界面系における二重層容量,電極抵抗,電荷移動抵抗等の見積もりが可能であった.さらに,プロチウム固溶過程のモデルを厳密等価回路を用いて表現し,得られた結果との整合性を議論することができた.特に,Mg_2Ni系粒子のプロチウムインサーション反応についての知見は,特に良い電気化学的整合性をみることができている. このマイクロ電極を用いた電気化学的手法は,従来の電池として用いられる電池活物質そのものの特性を評価することができる.結着剤,導電助剤等加えたコンポジット電極を用いた評価では,これらの影響が含まれるため,不確定性が大きい.また,プロチウムの拡散係数も,信憑性のおけるデータが得られており,この測定手法を応用することも可能であると考えている.また,マイクロ電極の手法は,電池の小型化という側面も持ち合わせている.マイクロレベルで電極を設計・制作し,電極の任意の位置に堆積して薄膜化する技術をもってすれば,現在の携帯機器に代表されるような新型2次電池技術に新たな側面を付与することができ,新たな技術の展開が期待される.さらにこのマイクロ電極を用いた電気化学測定を,燃料電池系にさらに展開し,燃料電池における電極触媒効能の評価を行っている.

  21. ラマン分光による光インサーション材料の界面構造解析

    伊藤 隆, 内田 勇

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特定領域研究(A)

    Institution: 東北大学

    1999 - 1999

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    当該研究は,光インサーション材料による構造規制界面の構築とそれによる新規な界面構造の機能発現過程を電気化学測定と組み合わせたラマン分光法やマイクロ電極法により追跡し,リチウムイオン2次電池材料における光充電の可能性追及とその機能発現のメカニズムを分光学的手法により解析することが目的である.当該領域で用いたラマン分光法は,非常に浅い測定深さを有しており,電気化学における根源的問題である固-液界面解析に有用な研究手法である.光インサーション反応は,光エネルギーを化学エネルギーに変換する独創的発想であり,この研究成果より,遷移金属化合物に新たな機能を有する界面構造が創製されると考えている.主眼となる研究手法は,その場ラマン分光法とマイクロ電極法である.特に静電噴霧法で作製したLi_xMn_2O_4薄膜電極を研究対象とし,光照射(インサーション)と対応した界面の極微細構造変化や格子震動変化を追跡し,光充電過程をミクロスコピックな観点から記述することを試みた.さらに複数の励起波長に対応したスペクトル測定を行い,電極材料のバンドギャップを意図したスペクトル解析を行った. はじめに有機電解液中におけるLi_xMn_2O_4薄膜電極のサイクリックボルタモグラム(CV)の測定を行った.Li_xMn_2O_4へのリチウムイオンの脱挿入反応に起因した電流応答が見られている.このCV測定を行いながらスペクトル測定を行なった.その結果,Li_xMn_2O_4中のxの減少に伴い,スペクトルに変化が見られ,新たなラマン線が出現した.この実験結果は,有機溶液中におけるLi_xMn_2O_4その場ラマン測定に初めて成功したことを意味している.さらに,スペクトル変化はLi_xMn_2O_4の相構造の変化により説明することができている.また,ラマンスペクトルの励起波長依存性についても検討を行なった.これは,Li_xMn_2O_4のバンドギャップを意図したスペクトル測定である。励起波長を514.5nm(2.48eV)から647.1nm(1.97eV)とすると,格子振動に起因するラマン線の散乱強度が減少した.これは,Li_xMn_2O_4の相変化に伴い,バンドギャップが変化したため,スペクトルの励起波長依存性が見られたと考えている.また,ラマン散乱強度は振動数に比例して減少することが知られており,これが,当該成果で得られた実験結果と合致することも否めない.どちらが優位であるかを現時点で判断できないが,当該課題で得られた励起波長を変化しながら測定したその場ラマンスペクトルより得られた知見は,壮大な光電気化学反応に大きな影響を与えると確信している.本研究は"光充電可能な2次電池"として大きな可能性を秘めており,今後さらなる研究が必要であろう.現在の携帯機器に代表されるような新型2次電池に新たな側面を構築することにより,新たな新技術が生まれだすと考えている.

  22. Micro-level tailoring of lithium ion extraction/insertion compounds and characterization of battery performance by microelectrode techniques with single particle electrodes

    UCHIDA Isamu, MATSUKI Kenzou, ITOH Takashi, NISHIZAWA Matsuhiko, URUSHIBATA Hiroaki, NISHINA Tatsuo

    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

    1998 - 1999

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    The present research project has aimed development of new materials for the lithium-ion secondary battery, which is applicable to electric vehicles, based on two novel techniques, one being the citrate precursor method for material preparation and the other a microelectrode technique for electrochemical characterization of powdered battery materials. (1) Under collaboration, Yamagata group obtained lithium nickelate and spinel-related lithium manganese oxides with good cyclability by the modified citrate method, which enabled us to prepare systematically the multi-components oxides with micro-level tailoring and atomic-level homogeneity. (2) Tohoku group has developed microelectrode techniques which are very versatile in electrochemical characterization and rapid searching tailored samples even in a small quantity of micro-meter size particles. In-situ observation of particle splitting due to the mechanical instability accompanied by the insertion/extraction of lithium ions, high potential (〜5V) voltammetry to examine the electrochemical stability of the particle in organic solutions, determination of diffusion coefficients of lithium ions in the solid phase by AC and potential step method, and in-situ Raman spectroscopy and in-situ conductivity measurements during insertion of lithium ions with micro-array electrode technique also have been carried. Data thus obtained were feedbacked to the partners and effectively utilized in further R&D.

  23. In Situ Spectroelectrochemical Reaction Field in Organic Solvents Competitive

    1995/04 -

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