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Tsuyoshi Takaoka

Section

Institute of Multidisciplinary Research for Advanced Materials

Job title

Associate Professor

Degree

Ph.D (Kyoto University)

researchmap

https://researchmap.jp/read0184485

J-GLOBAL ID

200901087794958471

Education 8

Tohoku University　IMRAM, Tohoku University

2001/04 - Present
Tohoku University　RISM, Tohoku University

1994/05 - 2001/03
Tsukuba University

1993/10 - 1994/03
kyoto University　Faculty of Science　Research associate

1993/04 - 1993/09
kyoto University　Faculty of Science　Doctor course

1990/04 - 1993/03
Graduate School of Kyoto University　Faculty of Science　Master course

1988/04 - 1990/03
Kyoto University　Faculty of Science

1984/04 - 1988/03
Neyagawa High School, Osaka

1980/04 - 1983/03

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Professional Memberships 5

JAPAN SOCIETY FOR MOLECULAR SCIENCE
Surface Science
応用物理学会
物理学会
化学会

Research Interests 1

solid surface

Research Areas 1

Nanotechnology/Materials / Basic physical chemistry / Surface Chemistry

Papers 60

Sensor behavior of MoS2 field-effect transistor with light injection toward chemical recognition Peer-reviewed

Md Iftekharul Alam, Tsuyoshi Takaoka, Hiroki Waizumi, Yudai Tanaka, Muhammad Shamim Al Mamun, Atsushi Ando, Tadahiro Komeda

RSC Advances　11　(43)　26509-26515　2021/08/03

DOI： 10.1039/d1ra03698j 　

eISSN： 2046-2069
The Effect of Molecular Adsorption on Electrical Properties of MoS2-FET Invited Peer-reviewed

Tsuyoshi TAKAOKA, Md IFTEKHAL ALAM, Hiroki WAIZUMI, Muhammad SHAMIM AL Mamun, Yudai Tanaka, Nguyen Tat Trung, Atsushi Ando, Tadahiro Komeda

Vacuum and Surface Science　63　(8)　419-424　2020/08

DOI： 10.1380/vss.63.419 　

ISSN： 2434-8589
Study of Friction of CO Molecule Adsorbed on Pt(997) Surface Peer-reviewed

T. Takaoka, T. Komeda

JOURNAL OF PHYSICAL CHEMISTRY C　112　(50)　19969-19978　2008/12

DOI： 10.1021/jp802823a 　

ISSN： 1932-7447
Estimation of friction of a single chemisorbed molecule on a surface using incident atoms Peer-reviewed

T. Takaoka, T. Komeda

PHYSICAL REVIEW LETTERS　100　(4)　046104　2008/02

DOI： 10.1103/PhysRevLett.100.046104 　

ISSN： 0031-9007
Sticking probability and adsorption process of NH3 on Si(100) surface Peer-reviewed

T. Takaoka, I. Kusunoki

Surface Science　412-413　30-41　1998/09/03
Publisher: Elsevier
DOI： 10.1016/S0039-6028(98)00366-5 　

ISSN： 0039-6028
INTERACTION OF ACETYLENE WITH THE PD(110)(1X2)-CS SURFACE - PROMOTION OF ETHYLENE FORMATION Peer-reviewed

T TAKAOKA, T SEKITANI, T ARUGA, M NISHIJIMA

SURFACE SCIENCE　306　(1-2)　179-192　1994/04

DOI： 10.1016/0039-6028(94)91196-7 　

ISSN： 0039-6028
Synthesis, Characterization and Catalytic Activity of Polyethylene Glycol (PEG) Functionalized MXene (Ti₃C₂T_x)

Maisha Rahman, Muhammad Shamim Al Mamun, Tsuyoshi Takaoka, Tadahiro Komeda, Mohamed Aly Saad Aly, Md Nasiruddin, Saiful Islam, Mohammad Farhadur Rahman, Waleed Alahmad

ChemistrySelect　10　(29)　2025/07/31
Publisher: Wiley
DOI： 10.1002/slct.202501044 　

ISSN： 2365-6549

eISSN： 2365-6549

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Abstract Two‐dimensional (2D) transition metal carbides and nitrides, collectively known as MXenes (e.g., Ti₃C₂T_x), have garnered significant attention due to their exceptional physicochemical properties and wide‐ranging applications. In this study, we systematically explore the synthesis, functionalization, and catalytic performance of MXene modified with polyethylene glycol (PEG) for the degradation of the organic dye methylene blue (MB). The functionalization process is carefully characterized, revealing that PEG incorporation enhances the hydrophilicity, colloidal stability, and catalytic activity of MXene. Through detailed mechanistic studies, we elucidate the synergistic effects of the MXene framework and PEG functional groups, which collectively contribute to the accelerated degradation kinetics of MB. Remarkably, the PEG‐functionalized MXene achieves a first‐order rate constant of 0.16581 ± 0.030 min⁻¹, demonstrating its superior catalytic efficiency. These findings not only highlight the transformative potential of organic molecule functionalization in tailoring MXene properties but also underscore its promise as a high‐performance material for advanced environmental remediation technologies. While many studies have focused on the degradation of MB dye, the use of MXene functionalized with PEG for this purpose remains relatively novel. Unlike traditional materials, MXene's excellent conductivity and hydrophilic properties, enhanced by PEG functionalization, present a promising alternative for dye degradation. Here a foundational understanding of MXene‐based composites and their application in sustainable water treatment processes.
Back‐Gated MoS₂ Field Effect Transistors as Probes for Melamine‐Induced Surface Charge Transfer Doping

Muhammad Shamim Al Mamun, Tsuyoshi Takaoka, Zhipeng Wang, Tadahiro Komeda

ChemistrySelect　10　(1)　2025/01/08
Publisher: Wiley
DOI： 10.1002/slct.202403982 　

ISSN： 2365-6549

eISSN： 2365-6549

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Abstract In this study, we report on the customization of multilayer MoS₂‐FET transfer properties by melamine via surface charge doping. NMP was used as a solvent to create the melamine solution. After melamine doping, the multilayer MoS₂’s charge carrier density was roughly doubled. After melamine doping, mobility was calculated to be around 28.57 cm⁻²V⁻¹s⁻¹, whereas the pristine's mobility was approximately 27.38 cm⁻²V⁻¹s⁻¹. The subthreshold swing of the doped device was ∼ 0.94 V/decade, which is less than the pristine device's ∼ 1.6 V/decade. The doped device demonstrated outstanding switching properties. A factor of greater than 7 was seen in the reduction of extracted contact resistance. The melamine molecule forces n‐doping on the multilayer MoS₂, as seen by the left shift of the threshold voltage following the doping process. Following the doping procedure, the Raman spectrum's downward trending E_2g and A_1g peaks shows that the n‐type doping system's electron concentration is rising. Melamine functions as an n‐type dopant, as confirmed by XPS evidence. Melamine is confirmed to be present on the MoS₂ surface by TOF‐SIMS and AFM measurements. Chemical doping might be a useful technique for improving the layered materials' electrical characteristics.
Caffeine-driven n-type doping in multilayer MoS2 field effect transistor

Muhammad Shamim Al Mamun, Tsuyoshi Takaoka, Tadahiro Komeda

Thin Solid Films　809　140591-140591　2025/01
Publisher: Elsevier BV
DOI： 10.1016/j.tsf.2024.140591 　

ISSN： 0040-6090
Photo-switching operation of MoS₂ field effect transistor by photoisomerization of azobenzene in solution delivered on a microfluidic platform

Md Nasiruddin, Zhipeng Wang, Hiroki Waizumi, Fatema Tul Afroz, Tsuyoshi Takaoka, Yasuyuki Sainoo, Mao Fukuyama, Tadahiro Komeda

Nanotechnology　35　(39)　395501-395501　2024/07/12
Publisher: IOP Publishing
DOI： 10.1088/1361-6528/ad5dc0 　

ISSN： 0957-4484

eISSN： 1361-6528

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Abstract Combining the photoisomerization of molecules with an electrical device is important for developing optoelectronic devices. Field effect transistors (FETs) with atomically thin channels are suitable for this purpose because the FET properties respond to chemical changes in molecules. Since the photoisomerization wavelength of the switching molecules can be tuned, complex logic operations can be realized if a specific molecule is delivered to the target FET of an integrated circuit. However, conventional techniques for transferring molecules, such as drop casting and sublimation, cannot efficiently realize this goal. In this study, we fabricated a MoS₂ FET device combined with a microfluidic platform, wherein the MoS₂ channel was in contact with the flow of an azobenzene solution in isopropyl alcohol as the solvent. UV radiation (365 nm) and thermal relaxation realize the cycle of trans- and cis-azobenzene states and the switching of the substantial FET properties. This study demonstrated the feasibility of using the solution for optical switching of the MoS₂-FET, which can realize quick phase changes in the molecule and the delivery of the molecule to the target FET by a microfluidic platform.
In-situ methyl red doped MoS2 field effect transistor made by atomically thin MoS2 channel

Muhammad Shamim Al Mamun, Hiroki Waizumi, Tsuyoshi Takaoka, Zhipeng Wang, Atsushi Ando, Tadahiro Komeda

Organic Electronics　126　106989-106989　2024/03
Publisher: Elsevier BV
DOI： 10.1016/j.orgel.2023.106989 　

ISSN： 1566-1199
Hysteresis in the transfer characteristics of MoS₂ field effect transistors: gas, temperature and photo-irradiation effect

Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tsuyoshi Takaoka, Atsushi Ando, Tadahiro Komeda

RSC Advances　14　(49)　36517-36526　2024
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d4ra04820b 　

eISSN： 2046-2069

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Light irradiation, ambient gas, and temperature all significantly increase hysteresis. Our observations show distinctive hysteretic behavior in MoS₂-FET in an oxygen environment at 1 atm.
Solvation Effects on the Electrical Properties of a Microfluid-Assisted Solution Field-Effect Transistor with Atomically Thin MoS2 Layers Peer-reviewed

Md Nasiruddin, Zhipeng Wang, Hiroki Waizumi, Tsuyoshi Takaoka, Yasuyuki Sainoo, Atsushi Ando, Ryuichi Arafune, Mao Fukuyama, Akihide Hibara, Tadahiro Komeda

ACS APPLIED NANO MATERIALS　2023/08

DOI： 10.1021/acsanm.3c02828 　

eISSN： 2574-0970
Microfluidic Approach for the Detection of Uric Acid through the Electrical Measurement of Atomically Thin MoS₂ Field-Effect Transistor Peer-reviewed

Md Nasiruddin, Hiroki Waizumi, Tsuyoshi Takaoka, Zhipeng Wang, Yasuyuki Sainoo, Muhammad Shamim Al Mamun, Atsushi Ando, MAO FUKUYAMA, Akihide Hibara, Tadahiro Komeda

The Analyst　accepted　2023/06
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d3an00772c 　

ISSN： 0003-2654

eISSN： 1364-5528

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There is a demand for biosensors working in vivo conditions, which requires significant device size and endurance miniaturization in solution environments. We demonstrated the detection of the uric acid (UA)...
Switching of N- and P-Type Doping with Partial Pressure of Oxygen Gas on Few Layers Mos2-Field Effect Transistor

Tadahiro Komeda, Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tsuyoshi Takaoka, Hiroki Waizumi, Zhipeng Wang, Atsushi Ando

SSRN Electronic Journal　2022
Publisher: Elsevier BV
DOI： 10.2139/ssrn.4193463 　

eISSN： 1556-5068
Large difference of doping behavior of tetracyanoquinodimethane (TCNQ) and 2,3,5,6-Tetrafluoro-7,7,8,8- tetracyanoquinodimethane (F4-TCNQ) on field effect transistor with channel of atomic layer MoS2 Peer-reviewed

Hiroki Waizumi, Muhammad, Shamim Al Mamun, Tsuyoshi Takaoka, Md Iftekharul Alam, Yudai Tanaka, Atsushi Ando, Zhipeng Wang, Ryuichi Arafune, Tadahiro Komeda

Applied Surface Science　571　151252-151252　2022/01

DOI： 10.1016/j.apsusc.2021.151252 　

ISSN： 0169-4332

eISSN： 1873-5584
Chemistry of Photo Isomerization and Thermal Reset of Nitro-Spiropyran and Merocyanine Molecules on Channel of MoS2 Field Effect Transistor Peer-reviewed

Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tsuyoshi Takaoka, Hiroki Waizumi, Zhipeng Wang, Md Iftekharul Alam, Atsushi Ando, Ryuichi Arafune, Tadahiro Komeda

Physical Chemistry Chemical Physics　18　(13)　2648-2654　2021/11
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d1cp04283a 　

ISSN： 1463-9076

eISSN： 1463-9084

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We explore the chemical reaction of the photo isomerization and thermal reaction of photochromic spiropyrans (SP) (1′,3′-Dihydro-1′,3′,3′-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′-(2H)-indole] molecule deposited on atomically thin channel of MoS₂ for field effect transistor (FET)...
In situ study of sensor behavior of MoS2 field effect transistor for methyl orange molecule in ultra high vacuum condition Peer-reviewed

Muhammad Shamim Al Mamun, Hiroki Waizumi, Tsuyoshi Takaoka, Md Iftekharul Alam, Yudai Tanaka, Atsushi Ando, Zhipeng Wang, Tadahiro Komeda

Nanotechnology　32　(7)　075501-075501　2021/02/12

DOI： 10.1088/1361-6528/abc3e1 　

ISSN： 0957-4484

eISSN： 1361-6528
Chemistry of the photoisomerization and thermal reset of nitro-spiropyran and merocyanine molecules on the channel of the MoS₂ field effect transistor Peer-reviewed

Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tsuyoshi Takaoka, Hiroki Waizumi, Zhipeng Wang, Md Iftekharul Alam, Atsushi Ando, Ryuichi Arafune, Tadahiro Komeda

Physical Chemistry Chemical Physics　23　(48)　27273-27281　2021
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d1cp04283a 　

ISSN： 1463-9076

eISSN： 1463-9084

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The reversible reaction of the photoisomerization and thermal reset of photochromic spiropyrans and merocyanine deposited on the MoS₂ FET channel.
In Situ Study of Molecular Doping of Chlorine on MoS2 Field Effect Transistor Device in Ultrahigh Vacuum Conditions International-journal Peer-reviewed

Nguyen Tat Trung, Mohammad Ikram Hossain, Md Iftekharul Alam, Atsushi Ando, Osamu Kitakami, Nobuaki Kikuchi, Tsuyoshi Takaoka, Yasuyuki Sainoo, Ryuichi Arafune, Tadahiro Komeda

ACS Omega　5　(43)　28108-28115　2020/11/03
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acsomega.0c03741 　

ISSN： 2470-1343

eISSN： 2470-1343

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We report a precise measurement of the sensor behavior of the field effect transistor (FET) formed with the MoS2 channel when the channel part is exposed to Cl2 gas. The gas exposure and the electrical measurement of the MoS2 FET were executed with in situ ultrahigh-vacuum (UHV) conditions in which the surface analysis techniques were equipped. This makes it possible to detect how much sensitivity the MoS2 FET can provide and understand the surface properties. With the Cl2 gas exposure to the channel, the plot of the drain current versus the gate voltage (Id-Vg curve) shifts monotonically toward the positive direction of Vg, suggesting that the adsorbate acts as an electron acceptor. The Id-Vg shifts are numerically estimated by measuring the onset of Id (threshold voltage, Vth) and the mobility as a function of the dosing amounts of the Cl2 gas. The behaviors of both the Vth shift and the mobility with the Cl2 dosing amount can be fitted with the Langmuir adsorption kinetics, which is typically seen in the uptake curve of molecule adsorption onto well-defined surfaces. This can be accounted for by a model where an impinging molecule occupies an empty site with a certain probability, and each adsorbate receives a certain amount of negative charge from the MoS2 surface up to the monolayer coverage. The charge transfer makes the Vth shifts. In addition, the mobility is reduced by the enhancement of the Coulomb scattering for the electron flow in the MoS2 channel by the accumulated charge. From the thermal desorption spectroscopy (TDS) measurement and density functional theory (DFT) calculations, we concluded that the adsorbate that is responsible for the change of the FET property is the Cl atom that is dissociated from the Cl2 molecule. The monotonic shift of Vth with the coverage suggests that the MoS2 device sensor has a good sensitivity to detect 10-3 monolayers (ML) of adsorption corresponding to the ppb level sensor with an activation time of 1 s.
Enhanced magnetic spin-spin interactions observed between porphyrazine derivatives on Au(111) Peer-reviewed

Jie Hou, Yu Wang, Keitaro Eguchi, Chihiro Nanjo, Tsuyoshi Takaoka, Yasuyuki Sainoo, Ryuichi Arafune, Kunio Awaga, Tadahiro Komeda

COMMUNICATIONS CHEMISTRY　3　(1)　2020/03

DOI： 10.1038/s42004-020-0282-5 　

ISSN： 2399-3669
Structural, Electronic, and Magnetic Properties of Cobalt Tetrakis (Thiadiazole) Porphyrazine Molecule Films on Au(111) Peer-reviewed

Yu Wang, Jie Hou, Keitaro Eguchi, Chihiro Nanjo, Tsuyoshi Takaoka, Yasuyuki Sainoo, Kunio Awaga, Tadahiro Komeda

ACS OMEGA　5　(12)　6676-6683　2020/03

DOI： 10.1021/acsomega.9b04453 　

ISSN： 2470-1343
Microfluidic tank assisted nicotine sensing property of field effect transistor composed of an atomically thin MoS2 channel Peer-reviewed

Muhammad Shamim Al Mamun, Yudai Tanaka, Hiroki Waizumi, Tsuyoshi Takaoka, Zhipeng Wang, Md Iftekharul Alam, Atsushi Ando, Mao Fukuyama, Akihide Hibara, Tadahiro Komeda

Physical Chemistry Chemical Physics　22　(47)　27724-27731　2020
Publisher: Royal Society of Chemistry (RSC)
DOI： 10.1039/d0cp05710j 　

ISSN： 1463-9076

eISSN： 1463-9084
Inter-molecule interaction for magnetic property of vanadyl tetrakis(thiadiazole) porphyrazine film on Au(1 1 1) Peer-reviewed

Jie Hou, Yu Wang, Keitaro Eguchi, Chihiro Nanjo, Tsuyoshi Takaoka, Yasuyuki Sainoo, Kunio Awaga, Tadahiro Komeda

Applied Surface Science　440　16-19　2018/05/15
Publisher: Elsevier B.V.
DOI： 10.1016/j.apsusc.2018.01.001 　

ISSN： 0169-4332
Study of migration of molecules on surfaces using supersonic molecular beam Invited

Takaoka Tsuyoshi

Proceedings of JSPE Semestrial Meeting　2015　303-304　2015/09/05
Publisher: The Japan Society for Precision Engineering
DOI： 10.11522/pscjspe.2015A.0_303 　
Surface temperature dependence on AlN film formation processes induced by supersonic N2 molecular beam

Yuden Teraoka, Muneaki Jinno, Tsuyoshi Takaoka, James Robert Harries, Ryuta Okada, Yutaro Iwai, Akitaka Yoshigoe, Tadahiro Komeda

IEEJ Transactions on Electronics, Information and Systems　134　(4)　524-525　2014
Publisher: Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejeiss.134.524 　

ISSN： 1348-8155 0385-4221
Atomically resolved Larmor frequency detection on Si(111)-7x7 oxide surface Peer-reviewed

Yasuyuki Sainoo, Hironari Isshiki, Syed Mohammad Fakruddin Shahed, Tsuyoshi Takaoka, Tadahiro Komeda

APPLIED PHYSICS LETTERS　95　(8)　2009/08

DOI： 10.1063/1.3204688 　

ISSN： 0003-6951

eISSN： 1077-3118
Penetration of ammonia molecule into ice film; activation energy analysis using Xe molecular beam irradiation Peer-reviewed

M. Inamura, T. Takaoka, T. Komeda

Surface Science　601　(4)　1072-1078　2007/02/15

DOI： 10.1016/j.susc.2006.11.050 　

ISSN： 0039-6028
Collision-induced migration of CO on Pt(997) surface Peer-reviewed

T. Takaoka, T. Komeda

SURFACE SCIENCE　601　(4)　1090-1100　2007/02

DOI： 10.1016/j.susc.2006.11.060 　

ISSN： 0039-6028

eISSN： 1879-2758
Ammonia adsorption on and diffusion into thin ice films grown on Pt(111) Peer-reviewed

T Takaoka, M Inamura, S Yanagimachi, Kusunoki, I, T Komeda

JOURNAL OF CHEMICAL PHYSICS　121　(9)　4331-4338　2004/09

DOI： 10.1063/1.1775781 　

ISSN： 0021-9606
Adsorption and Diffusion of Ammonia on Ice/Pt(111) Surface

TAKAOKA Tsuyoshi, INAMURA Miki, YANAGIMACHI Satoshi, KUSUNOKI Isao, KOMEDA Tadahiro

J. Surf. Sci. Soc. Jpn.　25　(8)　491-498　2004/08/10
Publisher: The Surface Science Society of Japan
DOI： 10.1380/jsssj.25.491 　

ISSN： 0388-5321

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Adsorption and diffusion of ammonia on an ice/Pt(111) surface were studied using Fourier transform infrared spectroscopy (FTIR) and thermal desorption spectroscopy (TDS). After exposing the crystalline ice film to ammonia molecules at 45 K, we have detected an intriguing feature at 1470 cm⁻¹ in the FTIR spectra. This feature is derived from the ammonia adsorption on the ice with a characteristic structure which appears in thin film region. The peak intensity decreases gradually as the thickness of the substrate ice increases. In addition, we have detected a feature at 1260 cm⁻¹ that appears after flashing the film to 113 K. The feature corresponds to the ammonia molecules which penetrate the ice surface and reach the ice/Pt(111) interface. Intriguingly, the intensity of this feature decreases with the ice thickness and there is a linear relation of the peak intensity of the features at 1470 cm⁻¹ and 1260 cm⁻¹. We propose a model that the solubility of the ammonia molecules is much higher for the thin ice film, whose structure is deformed from the ideal ice due to the presence of the metal substrate, than that for the ideal ice.
A study of collision-induced desorption of N-2 on the Ni(100) surface using Fourier transform infrared spectroscopy Peer-reviewed

T Takaoka, M Terahara, M Inamura, M Ohashi, Kusunoki, I

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　41　(10)　6137-6141　2002/10

DOI： 10.1143/JJAP.41.6137 　

ISSN： 0021-4922
Collision induced phenomena on the CO/H/Ni(100) surface Peer-reviewed

T Takaoka, M Inamura, S Yanagimachi, Kusunoki, I

JOURNAL OF CHEMICAL PHYSICS　116　(19)　8634-8635　2002/05

DOI： 10.1063/1.1467052 　

ISSN： 0021-9606

eISSN： 1089-7690
Study of Adsorption, Desorption, and Reaction at Surface Using Molecular Beams Peer-reviewed

Isao Kusunoki, Tsuyoshi Takaoka

Shinku/Journal of the Vacuum Society of Japan　45　(6)　489-497　2002

DOI： 10.3131/jvsj.45.489 　

ISSN： 0559-8516
XPS study of nitridation of diamond and graphite with a nitrogen ion beam Peer-reviewed

I. Kusunoki, M. Sakai, Y. Igari, S. Ishidzuka, T. Takami, T. Takaoka, M. Nishitani-Gamo, T. Ando

Surface Science　492　(3)　315-328　2001/10/20

DOI： 10.1016/S0039-6028(01)01430-3 　

ISSN： 0039-6028
AFM and XPS studies of a homoepitaxial diamond (001) surface nitrided using 500-eV N2+ ion beam Peer-reviewed

I. Kusunoki, Y. Igari, S. Ishidzuka, T. Takami, T. Takaoka, M. Nishitani-Gamo, T. Ando

Diamond and Related Materials　10　(9-10)　1676-1680　2001/09

DOI： 10.1016/S0925-9635(01)00394-6 　

ISSN： 0925-9635
Collision-induced desorption of N2 on Ni(100) studied with Fourier transform infrared spectroscopy Peer-reviewed

T. Takaoka, M. Terahara, I. Kusunoki

Surface Science　454　(1)　218-221　2000/05/20
Publisher: Elsevier Science B.V.
DOI： 10.1016/S0039-6028(00)00133-3 　

ISSN： 0039-6028
Nitridation of a diamond film using 300-700 eV N-2(+) ion beams Peer-reviewed

Kusunoki, I, M Sakai, Y Igari, S Ishidzuka, T Takami, T Takaoka, M Nishitani-Gamo, T Ando

DIAMOND AND RELATED MATERIALS　9　(3-6)　698-702　2000/04

DOI： 10.1016/S0925-9635(99)00253-8 　

ISSN： 0925-9635
A Fourier transform infrared study of collision induced desorption of N2 on Ni(100) surface Peer-reviewed

T. Takaoka, M. Terahara, M. Sakai, I. Kusunoki

Journal of Chemical Physics　111　(17)　8251-8252　1999/11/01
Publisher: American Institute of Physics Inc.
DOI： 10.1063/1.480158 　

ISSN： 0021-9606
Reaction of a Si (100) surface with a hot C2H4 beam Peer-reviewed

I. Kusunoki, Y. Igari, S. Ishidzuka, T. Mine, T. Takami, T. Takaoka

Surface Science　433-435　167-171　1999/08/02
Publisher: Elsevier
DOI： 10.1016/S0039-6028(99)00057-6 　

ISSN： 0039-6028
Comparison between the Reaction Mechanisms of Nitridation of Si(100) by a NH₃ Molecular Beam and by a N₂ Ion Beam Peer-reviewed

Isao Kusunoki, Shinji Ishidzuka, Yoshiyuki Igari, Tsuyoshi Takaoka

Surface Review and Letters　5　81-85　1998/04
Dispersion-Compensation Electron-Energy-Loss Spectroscopy Peer-reviewed

HIroshi Okuyama, Shinji Shimonaka, Yoshimi Yasui, Tsuyoshi Takaoka, Mitsuaki Nishijima, Yukihiro Taguchi

Japanese Journal of Applied Physics　37　(11)　6248-6252　1998/04
Publisher: The Japan Society of Applied Physics
DOI： 10.1143/JJAP.37.6248 　

ISSN： 0021-4922

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A dispersion-compensation electron-energy-loss spectrometer which consists of two 90° spherical sectors has been constructedand its characteristics have been tested. We have obtained the detector current of 160 pA with the full-width at half maximum of 25 meV for the primary electron energy of 19.5 eV in the direct mode, where electrons passing through the monochromator are directly detected by the analyzer without reflection from a sample. The obtained characteristics have been discussed, and suggestions for the design of an advanced spectrometer have been given.
Initial stage of SiC growth on Si(1 0 0) surface Peer-reviewed

T. Takaoka, H. Saito, Y. Igari, I. Kusunoki

Journal of Crystal Growth　183　(1-2)　175-182　1998
Publisher: Elsevier
DOI： 10.1016/S0022-0248(97)00391-6 　

ISSN： 0022-0248
Nitridation of Si(100) surface with NH3 Peer-reviewed

S. Ishidzuka, Y. Igari, T. Takaoka, I. Kusunoki

Applied Surface Science　130-132　107-111　1998
Publisher: Elsevier
DOI： 10.1016/S0169-4332(98)00034-8 　

ISSN： 0169-4332
Study of initial stage of SiC growth on Si(100) surface by XPS, RHEED and SEM Peer-reviewed

T Takaoka, H Saito, Y Igari, Kusunoki, I

SILICON CARBIDE, III-NITRIDES AND RELATED MATERIALS, PTS 1 AND 2　264-2　203-206　1998

ISSN： 0255-5476
Carbonization of Si Surface Peer-reviewed

Isao Kusunoki, Tsuyoshi Takaoka

Shinku/Journal of the Vacuum Society of Japan　41　(12)　992-1000　1998

DOI： 10.3131/jvsj.41.992 　

ISSN： 0559-8516
Adsorption of Carbonaceous Gases on Si Surfaces Peer-reviewed

Tsuyoshi Takaoka, Isao Kusunoki

Shinku/Journal of the Vacuum Society of Japan　41　(12)　981-991　1998

DOI： 10.3131/jvsj.41.981 　

ISSN： 0559-8516
Reaction of Si surfaces with a C2H4 beam Peer-reviewed

I. Kusunoki, T. Takagaki, S. Ishidzuka, Y. Igari, T. Takaoka

Surface Science　380　(1)　131-144　1997/05/01
Publisher: Elsevier
DOI： 10.1016/S0039-6028(97)00007-1 　

ISSN： 0039-6028
Photodissociation and desorption of multilayer acetone on a Si(100) surface by 193 nm laser irradiation Peer-reviewed

I. Kusunoki, M. Sakashita, T. Takaoka, H. Range

Surface Science　357-358　(1)　693-697　1996/06/20
Publisher: Elsevier
DOI： 10.1016/0039-6028(96)00247-6 　

ISSN： 0039-6028
Quantum delocalization of H on Pd(110): A vibrational study Peer-reviewed

N Takagi, Y Yasui, T Takaoka, M Sawada, H Yanagita, T Aruga, M Nishijima

PHYSICAL REVIEW B　53　(20)　13767-13771　1996/05

ISSN： 0163-1829
Observation of c(4 × 4) LEED pattern induced by reaction of Si(100) surface with C2H4 Peer-reviewed

T. Takaoka, T. Takagaki, Y. Igari, I. Kusunoki

Surface Science　347　(1-2)　105-110　1996/02/10
Publisher: Elsevier
DOI： 10.1016/0039-6028(95)00957-4 　

ISSN： 0039-6028
Quantum delocalization of H on Pd(110): A vibrational study Peer-reviewed

N. Takagi, Y. Yasui, T. Takaoka, M. Sawada, H. Yanagita, T. Aruga, M. Nishijima

Physical Review B - Condensed Matter and Materials Physics　53　(20)　13767-13771　1996

DOI： 10.1103/PhysRevB.53.13767 　

ISSN： 1550-235X 1098-0121
XPS study of the reaction of the Si(100) surface with a C2H4 beam Peer-reviewed

T. Takagaki, Y. Igari, T. Takaoka, I. Kusunoki

Applied Surface Science　92　287-290　1996
Publisher: Elsevier
DOI： 10.1016/0169-4332(95)00243-X 　

ISSN： 0169-4332
Nitridation of a Si(100) surface by 100-1000 eV N2+ ion beams Peer-reviewed

I. Kusunoki, T. Takaoka, Y. Igari, K. Ohtsuka

The Journal of Chemical Physics　101　(9)　8238-8245　1994

DOI： 10.1063/1.468194 　

ISSN： 0021-9606
Coadsorption of CO and C2H4 on Pd(110). Formation of a (3×2) mixed structure Peer-reviewed

T. Takaoka, Y. Yasui, M. Sawada, T. Aruga, M. Nishijima

Chemical Physics Letters　215　(6)　523-527　1993/12/17

DOI： 10.1016/0009-2614(93)89349-M 　

ISSN： 0009-2614
The reaction of benzene with Pd(110) and Pd(110)(1 × 2)-Cs surfaces Peer-reviewed

M. Nishijima, M. Fujisawa, T. Takaoka, T. Sekitani

Surface Science　283　(1-3)　121-125　1993/03/01

DOI： 10.1016/0039-6028(93)90969-Q 　

ISSN： 0039-6028
Adsorption and Thermal Decomposition of Benzene on the Pd(110)(1X2-Cs surface : High-Resolvtion Electron Energy Spectroscopy, Thermal Desorption, and Low-Energy Electron Diffraction Studies Peer-reviewed

Masahiko Fujisawa, Tsuyoshi Takaoka, Tetsuji Sekitani, Mitsuaki Nishijima

Journal of physical chemistry　96　(11)　4602-4608　1992/04

DOI： 10.1021/j100190a085 　
Interaction of Ethylene with the H-covered Pd(110) surface Peer-reviewed

Mitsuaki Nishijima, Tetsuji Sekitani, Tsuyoshi Takaoka, Masashi Fujisawa

Journal of Molecular Catalysis　74　163-167　1992/04

DOI： 10.1016/0304-5102(92)80233-7 　
Interation of Ethylene with the H-Preadsorbed Pd(110)surface : Hydrogenation and H-D-Exchange Reactions Peer-reviewed

Tetsuji Sekitani, Tsuyoshi Takaoka, Masahiko Fujisawa, Mitsuaki Nishijima

Journal of physical chemistry　96　(21)　8462-8468　1992/04

DOI： 10.1021/j100200a048 　
Adsorbed state of benzene on the Si(100) surface: Thermal desorption and electron energy loss spectroscopy studies Peer-reviewed

Y. Taguchi, M. Fujisawa, T. Takaoka, T. Okada, M. Nishijima

The Journal of Chemical Physics　95　(9)　6870-6876　1991

DOI： 10.1063/1.461498 　

ISSN： 0021-9606

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Misc. 37

Electrical Property and Photo response in Field-Effect Transistors with Vertically Stacked Heterostructure Channels Made of 2D materials

和泉廣樹, 高岡毅, 安藤淳, NASIRUDDIN Md., 坂下晃輔, 佐藤碧, 岡田光博, 久保利隆, 米田忠弘

応用物理学会春季学術講演会講演予稿集(CD-ROM)　70th　2023

ISSN： 2436-7613
The Property of MoS₂-FET Under flowing Alcohol Fluids

高岡毅, 高橋巧成, 和泉廣樹, UDDIN Nasir, 道祖尾恭之, 安藤淳, 米田忠弘

応用物理学会春季学術講演会講演予稿集(CD-ROM)　69th　2022

ISSN： 2436-7613
The Effect of Alcohol Fluids onto the Property of MoS₂-FET

高岡毅, UDDIN Nasir, 和泉廣樹, 道祖尾恭之, 安藤淳, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　83rd　2022

ISSN： 2436-7613
The Property of MoS₂-FET Under Alcohol Fluids

高岡毅, 田中悠太, 和泉廣樹, 高橋巧成, ALAM Md Iftekharul, AL MAMUN Muhammad Shamim, 道祖尾恭之, 米田忠弘

応用物理学会春季学術講演会講演予稿集(CD-ROM)　68th　2021

ISSN： 2436-7613
Electrical conduction characteristic change in MoS₂ FET in the gas environment

道祖尾恭之, AL. MAMUN M.S., 高岡毅, 和泉廣樹, WANG Z., ALAM M. I., 田中悠太, 高橋巧成, 安藤淳, 荒船竜一, 米田忠弘

応用物理学会春季学術講演会講演予稿集(CD-ROM)　68th　2021

ISSN： 2436-7613
Changes in Electrical Properties and Surface Conditions due to Molecular Adsorption on MoS₂ Surface

和泉廣樹, SHAMIM AL Mamun Muhammad, 高橋巧成, MD Iftekharul Alam, NASIRUDDIN, 高岡毅, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　82nd　2021

ISSN： 2436-7613
Photo-response of MoS₂-FET with CuPc, CoPc, and H₂Pc molecules

高岡毅, ALAM Md Iftekharul, 和泉廣樹, 高橋巧成, AL MAMUN Muhammad Shamim, UDDIN Nasir, 道祖尾恭之, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　82nd　2021

ISSN： 2436-7613
Optical response of exfoliated MoS₂ FETs in gaseous atmosphere

道祖尾恭之, MAMUN M.S. Al., 高岡毅, 和泉廣樹, WANG Z., ALAM M. I., 田中悠太, 高橋巧成, 安藤淳, 荒船竜一, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　82nd　2021

ISSN： 2436-7613
紫外光電子分光実験を用いた分子吸着に由来するMoS₂表面で生じる電子状態変化の観測

和泉廣樹, 田中悠太, 高橋巧成, IFTEKHARUL Alam Md, MAMUN Muhammad Shamim Al, 高岡毅, 米田忠弘

東北大学多元物質科学研究所研究発表会講演予稿集　20th　2020
Photo-response of MoS2-FET with CuPc molecules

高岡毅, MD Iftekharu Alam, 和泉廣樹, 田中悠太, MUHAMMAD Shamim Al Mamun, 米田忠弘

応用物理学会春季学術講演会講演予稿集(CD-ROM)　67th　2020

ISSN： 2436-7613
MoS₂-FET Operated Under the Fluids and Drops

田中悠太, 高岡毅, 和泉廣樹, MAMUN Muhammad Shamim Al, IFTEKHARUL Alam Md, 米田忠弘

応用物理学会春季学術講演会講演予稿集(CD-ROM)　67th　2020

ISSN： 2436-7613
Observation of Electronic State Change due to Molecular Adsorption on MoS₂ Surface using Ultraviolet Photoelectron Spectroscopy

和泉廣樹, 田中悠太, 高橋巧成, ALAM Md Iftekharul, MAMUN Muhammad Shamim Al, 高岡毅, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　81st　2020

ISSN： 2436-7613
MoS₂-FET Operated Under the Fluids and Drops

田中悠太, 高岡毅, 和泉廣樹, MAMUN Muhammad Shamim Al, IFTEKHARUL Alam Md, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　81st　2020

ISSN： 2436-7613
分子吸着によるキャリアドーピングを用いたMoS₂-FETの電気特性変化

和泉廣樹, 高岡毅, TRUNG Nguyen Tat, ALAM Md Iftekhar, 鷲田一樹, MAMUN Muhammad Shamim AL, 米田忠弘

日本物理学会講演概要集(CD-ROM)　74　(1)　2019

ISSN： 2189-079X
TCNQをチャンネルにドープしたMoS₂FETへの光照射効果

和泉廣樹, 鷲田一樹, 高岡毅, NGUYEN Tat Trung, IFTEKHAR Md. Alam, 米田忠弘

日本物理学会講演概要集(CD-ROM)　74　(2)　2019

ISSN： 2189-079X
MoS₂-FET分子センサーにおける高感度な電気特性変化を応用した気体分子吸着前後でのMoS₂表面状態変化の観測

和泉廣樹, 高岡毅, IFTEKHARUL Alam Md, MAMUN Muhammad Shamim Al, 田中悠太, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　80th　2019

ISSN： 2436-7613
流体環境下における二硫化モリブデン電界効果トランジスタの動作特性

田中悠太, 高岡毅, 和泉廣樹, MAMUN Muhammad Shamim Al, IFTEKHARUL Alam Md, 米田忠弘

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　80th　2019

ISSN： 2436-7613
Nitridation of Al(111) Surface induced by N2 Translational Energy: Surface Temperature Dependence

TERAOKA Yuden, JINNO Muneaki, TAKAOKA Tsuyoshi, HARRIES James, OKADA Ryuta, IWAI Yutaro, YOSHIGOE Akitaka, KOMEDA Tadahiro

化学反応討論会講演要旨集　29th　53　2013/06/05
N₂並進運動エネルギー誘起Al(111)窒化膜の成膜温度による膜質の変化と773K以下における熱変性

神農宗徹, 寺岡有殿, 高岡毅, 岡田隆太, 岩井優太郎, 吉越章隆, 米田忠弘

真空に関する連合講演会講演予稿集　53rd　29　2012/11/14
金属表面における分子ビームによる酸化・窒化反応制御とその放射光光電子分光観察 II

寺岡有殿, 井上敬介, 神農宗徹, HARRIES James, 岡田隆太, 岩井優太郎, 高岡毅, 吉越章隆, 米田忠弘

日本学術会議材料工学連合講演会講演論文集　56th　360-361　2012/10/29
N₂運動エネルギー誘起Al(111)窒化膜の773K以下における熱変性

神農宗徹, 寺岡有殿, 高岡毅, 岡田隆太, 岩井優太郎, 吉越章隆, 米田忠弘

応用物理学会学術講演会講演予稿集(CD-ROM)　73rd　ROMBUNNO.13A-C3-8　2012/08/27
N₂運動エネルギー誘起Al(111)窒化におけるインキュベーション時間の623K以下での表面温度依存性

神農宗徹, 寺岡有殿, 高岡毅, 吉越章隆, 米田忠弘

応用物理学関係連合講演会講演予稿集(CD-ROM)　59th　ROMBUNNO.18A-B6-4　2012/02/29
Analysis of nitrogen distribution in Nitride Films on Al(111) formed by Kinetic Energy Induced N2 Adsorption

TAKAOKA Tsuyoshi, Jinno Muneaki, Teraoka Yuden, Okada Ryuta, Iwai Yutaro, Harries James, Yoshigoe Akitaka, Komeda Tadahiro

Abstract of annual meeting of the Surface Science of Japan　32　(0)　140-140　2012
Publisher: 公益社団法人日本表面科学会
DOI： 10.14886/sssj2008.32.0_140 　

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窒化アルミニウム（AlN）は様々な機能を持つ材料として注目されている。N2ガスはアルミニウムとは反応しにくいので、AlN薄膜形成には化学気相成長などの方法が用いられる。しかし、我々は超高真空中でAl(111)表面に並進運動エネルギー1.8 eV以上の超音速N2分子線を照射すると室温でも直接窒化反応が起こることを見出した。この手法によって作製したAlN薄膜における窒素原子の深さ方向分布について、主に角度分解放射光XPSを用いて解析した。
Surface temperature dependence of incubation time in N2 kinetic energy induced Al(111) nitridation

jinno muneaki, teraoka yuden, Takaoka Tsuyoshi, Harries James, Yoshigoe Akitaka, Komeda Tadahiro

Abstract of annual meeting of the Surface Science of Japan　31　(0)　32-32　2011
Publisher: 公益社団法人日本表面科学会
DOI： 10.14886/sssj2008.31.0.32.0 　

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Al(111)表面の超音速N<SUB>2</SUB>分子線による運動エネルギー誘起窒化では表面温度473 Kでは直線状の吸着曲線が得られるが、373 Kではインキュベーション時間が確認され、室温ではさらにインキュベーション時間が長くなった。このようなインキュベーション時間の存在と大きな表面温度依存性はN原子の拡散を示唆している
26aWS-1 Displacement of NO on Pt(997) surface

Takaoka Tsuyoshi, Komeda Tadahiro

Meeting abstracts of the Physical Society of Japan　65　(2)　880-880　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Study of Friction of Molecules Adsorbed on a Surface by Using Supersonic Molecular Beam Peer-reviewed

Tsuyoshi Takaoka, Tadahiro Komeda

日本物理学会誌　64　(8)　627-631　2009/08
27aRD-3 Collision induced migration of NO on Pt(997) surface

Takaoka Tsuyoshi, Komeda Tadahiro

Meeting abstracts of the Physical Society of Japan　64　(1)　868-868　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aXB-1 Friction of molecules on surface using the collision with supersonic molecular beam

Takaoka Tsuyoshi, Komeda Tadahiro

Meeting abstracts of the Physical Society of Japan　63　(2)　810-810　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Control and FTIR Analysis of CO Diffusion on Pt(997) Surface

TAKAOKA Tsuyoshi, KOMEDA Tadahiro

Journal of the Surface Science Society of Japan　28　(8)　440-446　2007/08/10
Publisher: 日本表面科学会
ISSN： 0388-5321
21pWH-9 migration of CO on Pt(997) surface

Takaoka Tsuyoshi, Komeda Tadahiro

Meeting abstracts of the Physical Society of Japan　62　(1)　929-929　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27pXJ-5 lateral motion of CO on Pt surface

Takaoka Tsuyoshi, Komeda Tadahiro

Meeting abstracts of the Physical Society of Japan　61　(1)　867-867　2006/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Study on carbonization of Si(100) surface using hot C2H4 molecular beam

Yoshiyuki Igari, Shinji Ishidzuka, Tsuyoshi Takaoka, Tomohide Takami, Isao Kusunoki

Bulletin of Technical Service Center, The Research Institute for Scientific Measurements, Tohoku University　3　(1)　8-15　2000/03
Reaction of Si(100) Surface with High Temperture Ethylene Beam Peer-reviewed

IGARI Yoshiyuki, ISHIZUKA Shinji, MINE Tetsuroh, TAKAOKA Tsuyoshi, TAKAMI Tomohide, KUSUNOKI Isao

真空　41　(3)　391-392　1998/03/20

ISSN： 0559-8516
Development of heat-tyoe nozzle for hot molecular beam and the study on carbonization reaction of Si surface using the hot molecular beam

Yoshiyuki Igari, Tsuyoshi Takaoka, Tomohide Takami, Shinji Ishidzuka, Tetsuro Mine, Isao Kusunoki

Bulletin of Technical Service Center, The Research Institute for Scientific Measurements, Tohoku University　1　(1)　51-61　1998/03
Development of a Surface Reaction Analysis System Equipped with a Molecular Beam Apparatus and an Infrared Spectrometer

Tsuyoshi Takaoka, Mihoko Sakai, Tetsuro Mine, Yoshiyuki Igari, Toshiaki Sasaki, Isao Kusunoki

Bulletin of the Research Institute for Scientific Measurements, Tohoku University　46　(1)　69-80　1997/04
Publisher: 東北大学科学計測研究所
ISSN： 0040-8689
Difference in silicon nitride film growth mechanisms by reaction with N_2^+ and NH_3

ISHIDUKA Shinji, IGARI Yoshiyuki, TAKAOKA Tsuyoshi, KUSUNOKI Isao

1996　(95)　121-128　1996/11/27
Adsorption process of ammonia on Si(100)surface

Takaoka Tsuyoshi, Kusunoki Isao

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1996　(2)　527-527　1996/09/13
Publisher: The Physical Society of Japan (JPS)

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Books and Other Publications 2

表面物性工学ハンドブック第２版

高岡毅

丸善　2007/01
Handbook of Interfaces: Chemistry and Engineering

Jun Yoshinobu, Tsuyoshi Takaoka

NTS Inc　2001/04

Presentations 36

Photo-response of MoS2-FET with CuPc molecules

Tsuyosi Takaoka, Md Iftekharu Alam, Hiroki, Waizumi, Yudai Tanaka, Muhammad, Shamim Al Mamun, Tadahiro Komeda

The 67th JSAP Spring Meeting 2020　2020/03/14
Effect of The Adsorption of TCNQ And F4-TCNQ on MoS2–based FET International-presentation

Tsuyoshi TAKAOKA, Tat Trung, NGUYEN, Md Iftekharul ALAM, Kazuki WASHIDA, Hiroki WAIZUMI, Muhammed Shamim Al MAMUN, Tadahiro KOMEDA

MRM2019 - MATERIALS RESEARCH MEETING 2019　2019/12/11
Measurements of Photo-current of MoS2-FET with Molecules on the Surface

TAKAOKA Tsuyoshi, Hiroki Waizumi, Alam Md, Iftekharul, Muhammad, Shamim Al Mamun, Yudai Tanaka, Tadahiro Komeda

spectroscopy of surfaces and interfaces 2019　2019/12/06
The effect of the Molecular adsorption on Electrical properties of MoS2-FET

TAKAOKA Tsuyoshi, Md Iftekhal Alam, Hiroki Waizumi, Yudai Tanaka, Muhammad, Shamim Al Mamun, Tadahiro Komeda

10th meeting of molecular archtechtonics　2019/11/08
The effect of the Molecular adsorption on Electrical properties of MoS2-FET Invited

TAKAOKA Tsuyoshi, Hiroki Waizumi, Md Iftekhal Alam, Muhammad, Shamim Al Mamun, Yudai Tanaka, Nguyen Tat Trung, Atsushi Ando, Tadahiro Komeda

annual meeting of the Japan society of vacuum and surface science 2019　2019/10/30
The Effect of Several Adsorbates on FET Properties of MoS2 Thin Layers International-presentation

Takaoka, T. T. Nguyen, I. Tsukamoto, I. Alam, M. I. Hossain, K. Washida, H. Waizumi, T. Komeda

ACSIN-14 & ICSPM26　2018/10/22
Molecular Doping on MoS2 FET

TAKAOKA Tsuyoshirung, TSUKAMOTO Ippei, Iftekhar Md. Alam, Md. Ikram Hosain, WASHIDA Kazuki, ANDO Atsushi, KOMEDA Tadahiro

The 65th JSAP Spring Meeting, 2018　2018/03/19
FET properties of MoS2 thin layers with adsorbates International-presentation

T. Takaoka, T.T. Nguyen, I. Tsukamoto, A.M. Iftekharul, M.I. Hossain, T. Komeda, A. Ando

The 8th International Symposium on Surface Science　2017/10/24
ドーパミン溶液/MoS2-FETの電気特性

高岡毅, Nasiruddin Md, 和泉廣樹, 道祖尾恭之, 安藤敦, 米田忠弘

2023年第84回応用物理学会秋季学術講演会　2023/09/22
Property of MoS2-FET With Flowing Alcohol Fluid on the Channel International-presentation

Tsuyoshi Takaoka, Kosei Takahashi, Hiroki Waizumi, NasirUddin, Yasuyuki Sainoo, Atsushi Ando, Tadahiro Komeda

14th International Symposium on Atomic Level Characterizations for New Materials and Devices '22　2022/10/19

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1. Introduction Molecular sensor technology is of great interest. Molybdenum disulfide (MoS2), which is a layered material, can obtain an ultrathin film consisting of several atomic layers by a simple method such as an exfoliation technique. Since the MoS2 ultrathin film has a large specific surface area and its electronic properties are extremely sensitive to the change of the surface conditions, including adsorption of molecules on the surface. Then, it is attracting attention as a sensor device material that can detect trace amounts of target molecules with high accuracy [1]. In this study, we investigated changes in electrical characteristics when a field-effect transistor (FET) using MoS2 as a channel material comes into contact with a liquid. 2. Experimental After transferring a MoS2 ultra-thin film (three atomic layers) onto a SiO2/ p ++ Si substrate, a MoS2-FET device was generated through processes such as resist coating, electron beam lithography, and electrode material deposition (*). A microfluidic channel made of polydimethylsiloxane (PDMS) is adhered to the surface of this TiO2 / MoS2-FET device, and the solution is supplied from a syringe connected via a capillary to measure the electrical properties of the device in contact with the solution. (see Figure 1). 3. Results and Discussion A current (Id) flowing through source electrode and drain electrode with drain voltage of 100 mV was measured as a function of the gate voltage (Vg) applied to the Si substrate. Vg dependence of Id (Id-Vg plot) was obtained when isopropyl alcohol (IPA) was on the TiO2/MoS2-FET device through a microfluidic channel made of PDMS. When the velocity of IPA is almost zero, Id-Vg plot shown as the blue solid line was observed in Figure 2. After the syringe pump is turned on and the velocity of IPA reaches 80 mm / s, Id-Vg plot shown as the red solid line was observed. Then, it was found that the Id-Vg characteristics for the IPA flowing at 80mm/s is different from one for the IPA at 0mm/s. Next, we repeated the same processes again. The results for the second cycle are shown as dotted lines in the figure. It is clear that the difference between IPA at 0mm/s and IPA at 80mm/s is observed in the second cycle too. The results show that the Id increases with increase of the velocity of IPA for negative Vg. It has been confirmed that the electric property of MoS2-FET is very sensitive to the electric charge in the vicinity of MoS2 channel [1]. Then, the flow of the liquid might cause the change of the electric charge at the interface of the adsorbed IPA molecules and the surface, resulting in the change of the electric property of MoS2-FET in our experiment. References [1] Trung, N. T., et al., ACS Omega 5 (2020) 28108.
MoS2-FET 電気特性に対する液相アルコールの効果

高岡毅, 和泉廣樹, NasirUddin, 道祖尾恭之, 安藤淳, 米田忠弘

2022年第83回応用物理学会秋季学術講演会　2022/09/21
Photocurrent Spectra of CuPc-adsorbed MoS2-FET International-presentation

Tsuyoshi TAKAOKA, Md Iftekharu Alam, Hiroki Waizumi, Atsushi Ando, Tadahiro Komeda

The 22nd International Vacuum Congress　2022/09/14

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1. Introduction An application of the field effect transistor (FET) with an atomically thin Molybdenum disulfide (MoS2) channel to sensors attracts attentions, where the adsorption of molecules on the channel is detected by the FET property. In this article, we obtained the photocurrent vs λ spectra from photo-current by injection of monochromatized light on the copper phthalocyanine (CuPc) deposited surface. 2. Experimental MoS2 flakes were exfoliated from a natural crystal by using the adhesive tape method on to the SiO2/p-type Si substrate. The electrodes are formed by 5 nm-thick Ti and 100-nm-thick Au. FET characterization was done under ultra-high vacuum condition [1]. Figure 1 (a) Drain current variation with the injection of the light of 650 nm. (b) Photo-current variation for several wavelengths after 2 Å CuPc deposition. 3. Results and Discussion Figure 1 (a) shows drain current variation with the injection of the light of 650 nm for 0.5 s in every 1 s. The photocurrent can be seen during the photo irradiation. The results for several wavelengths after 2 Å CuPc deposition show that the photocurrent has a large dependence on the wavelengths of the injecting light as shown in Figure 1(b). Figure 2 The photo-responsivity for (a) the pristine MoS2, (b) 2 Å CuPc and (c) 10 Å CuPc deposited cases. Figure 2 show the photo-responsivity as a function of the wavelength of the incident light for (a) the pristine MoS2, (b),(c) CuPc deposited cases. The plot for the pristine surface is fitted with three Gaussian peaks with the center wavelength of 550, 610, 650 nm, and an additional peak at 705 nm is employed for the sample with CuPc. These results indicate that the peak at 705 nm corresponds to the adsorption of CuPc. The technique can be employed for the molecular sensing with the chemical recognition capability. [1] Alam, I. M. et.al., RSC advances, 2021, 11, 26509 – 26515. * This work was conducted at NIMS Nanofabrication Platform, supported by "Nanotechnology Platform Program" of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
アルコール流体存在下におけるMoS2-FETの電気特性

高岡毅, 高橋巧成, 和泉廣樹, ddin Nasir, 道祖尾恭之, 安藤淳, 米田忠弘

2022年第69回応用物理学会春季学術講演会　2022/03/22
Photocurrent Spectra of phthalocyanine adsorbed MoS2-FET

Tsuyoshi Takaoka, Md Iftekharul Alam, HIroki Waizumi, Kosei Takahashi, Nasir Uddin, Yasuyuki Sainoo, Atsushi Ando, Tadahiro Komeda

Surface and interface spectroscopy 2021　2021/12/10
UV/Thermally Induced Isomerization of Nitro-Spiropyran on MoS2 Lattice Observed by MoS2 Field Effect Transistor International-presentation

Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tsuyoshi Takaoka, Hiroki Waizumi, Zhipeng Wang, Md Iftekharul Alam, Kosei Takahashi, Atsushi Ando, Ryuichi Arafune, Tadahiro Komeda

ASOMEA-X 2021　2021/10/25
Spectra of the Photocurrent of CuPc-adsorbed MoS2-FET

Tsuyoshi Takaoka, Md Iftekharul Alam, Hiroki Waizumi, Kosei Takahashi, Muhammad Shamim Al Mamun, Atsushi Ando, Tadahiro Komeda

ASOMEA-X 2021　2021/10/25
Spectral change of photocurrent of CuPc-adsorbed MoS2-FET

Tsuyoshi Takaoka, Md Iftekharul Alam, Hiroki Waizumi, Atsushi Ando, Tadahiro Komeda

ALC'21 Online; 13th International Symposium on Atomic Level Characterizations for New Materials and Devices '21　2021/10/20
Photo-response of MoS2-FET with CuPc, CoPc, and H2Pc molecules

Tsuyosi Takaoka, Md, Iftekharu Alam, Hiroki Waizumi, Kosei Takahashi, Muhammad Shamim Al Mamun, Nasir Uddin, Yasuyuki Sainoo, Tadahiro Komeda

The 82th JSAP autumn meeting 2021　2021/09/13
Photo Enhanced Electrical Properties of Organic Dye Doped MoS2 FET Sensor

Md Iftekharul Alam, Tsuyoshi Takaoka, Hiroki Waizumi, M. Shamim Al Mamun, Yudai Tanaka, Kosei Takahashi, Tadahiro Komeda, Atsushi Ando

The 68th JSAP spring meeting 2021　2021
The Property of MoS2-FET Under Alcohol Fluids

Tsuyoshi Takaoka, Yudai, Tanaka, Hiroki Waizumi, Kosei Takahashi, Md Iftekharul Alam, Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tadahiro Komeda

The 68th JSAP spring meeting 2021　2021
Observation of Molecular Switching of Spiropyran by MoS2 Field Effect Transistor

Muhammad Shamim Al Mamun, Yasuyuki Sainoo, Tsuyoshi Takaoka, Hiroki Waizumi, Zhipeng Wang, Md Iftekharul Alam・Yudai Tanaka, Kosei Takahashi, Atsushi Ando・Ryuichi Arafune・Tadahiro Komeda

Spectroscopy of Interfaces and Surfaces 2020　2020/12/04
Ultraviolet Photoelectron Spectroscopy of MoS2 surface with adsorbed molecules

Hiroki Waizumi, Yudai Tanaka, Kose Takahashi, Md Iftekharul Alam, Muhammad Shamim Al Mamun, Tsuyoshi Takaoka, Tadahiro Komeda

Spectroscopy of Interfaces and Surfaces 2020　2020/12/05
Spectra of photo-response of MoS2-FET with CuPc adsorbed on the surface

Tsuyoshi Takaoka, Md Iftekharul Alam, Hiroki Waizumi, Yudai Tanaka, Muhammad Shamim Al Mamun, Kose Takahashi, Tadahiro Komeda

Spectroscopy of Interfaces and Surfaces 2020　2020/12/05
Tunable Optical Properties of Copper Phthalocyanine Molecules Adsorbed on MoS2 Based Field Effect Transistor

Md Iftekharul Alam, Tsuyoshi Takaoka, Hiroki Waizumi, M. Shamim Al Mamun, Yudai Tanaka, Tadahiro Komeda

The 81th JSAP autumn meeting, 2020　2020/09/08
Transfer characteristics of MoS2-based FET exposed to solution

Yudai Tanaka, Tsuyoshi Takaoka, Hiroki Waizum, Iftekharul Alam, Muhammad, Shamim Al Mamun, Tadahiro Komeda

The 81st JSAP Autumn Meeting 2020　2020/09/11
Microfluidic Tank Engineeering and Functionalization of Two Dimensional MoS2 by Nicotine

Muhammad Shamim Al Mamun, Yudai Tanaka, Hiroki Waizumi, Tsuyoshi Takaoka, Zhipeng Wang, Md Iftekharul Alam, Atsushi Ando, Tadahiro Komeda

The 81st JSAP Autumn Meeting 2020　2020/09/11
Observation of Electronic State Change of MoS2 Surface by Molecular Adsorption using UV Photoelectron Spectroscopy

Hiroki Waizum, Yudai Tanaka, Kousei Takahashi, Md Iftekharul Alam, Muhammad, Shamim Al Mamun, Tsuyoshi Takaoka, Tadahiro Komeda

The 81st JSAP Autumn Meeting 2020　2020/09/11
Change in the photo response by Adsorption of Copper Phthalocyanine Molecules on MoS2-FET International-presentation

Hiroki Waizumi, Tsuyoshi Takaoka, Kazuki Washida, Md Iftekharul Alam, Muhammed Shamim Al Mamun, Tat Trung Nguyen, Tadahiro Komeda

MRM2019 - MATERIALS RESEARCH MEETING 2019　2019/12/11
Effec of TCNQ adsorption to the transfer property of MoS2-based FET

和泉廣樹, 高岡毅, Nguyen Tat Trung, Iftekhar Md Alam, 鷲田一樹, Mamun Muhammad, Shamim Al, 米田忠弘

Spectroscopy of surfaces and interfaces 2018　2018/11/30
Doping of CuPc to MoS2-based FET

鷲田一樹, Nguyen T. Trung, Alam MD Iftekharul, 和泉廣樹, 高岡毅, 安藤淳, 米田忠弘

Spectroscopy of surfaces and interfaces 2018　2018/11/30
MoS2-FET Operated Under the Fluids: Sensor Application Study

Nguyen Tat Trung, Kazuki Washida, Hiroki Waizumi, Md Ifterkharul Alam, Atsushi Ando, Tsuyoshi Takaoka, Tadahiro Komeda

Spectroscopy of surfaces and interfaces 2018　2018/11/30
Effect of Cl2 and HCl gas Molecules Adsorption on the Electrical Properties of Transition Metal Dichalcogenides

Alam Md Iftekharul, Takaoka TsuyoshiA, Nguyen Tat Trung, Washida Kazuki, Tsukamoto Ippei, Waizumi Hiroki, Komeda Tadahiro

The physical society of Japan, Autumn Meeting 2018.　2018/09/11
Doping Effect of TCNQ to MoS2 FET

TAKAOKA Tsuyoshi

JSPS meeting 2018 autumn　2018/09/11
Adsorption state of biomolecules observed from transfer properties of MoS2 FET

Nguyen Tat Trung, TAKAOKA Tsuyoshi, KOMEDA Tadahiro

Th 8th　2017/11/04
The Effect of Adsorbates on of FET of MoS2 Thin Layers

塚本一平, 米田忠弘, 安藤淳, 高岡毅, グエンタットトルン, Ikram Hossain Mohammad, Alam Md Iftekharul

37th annual meeting of Surface science society of Japan　2017/08/19
Kondo Effect of Vanadyl tetrakis(thiadiazole)porphyrazine (VOTTDPz) on Au surface

Hou Jie, Yu Wang, TAKAOKA Tsuyoshi, KOMEDA Tadahiro, AWAGA Kunio

The 72th annual meeting of physical society of Japan　2017/03/18

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Research Projects 21

糖鎖構造の高選択的認識に向けた革新的二次元物質FETバイオセンサーの創製

高岡毅

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

2026/04/01 - 2030/03/31
Observation of the electronic states of adsorbed molecules on MoS2-based FET by monochromatic light

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
Electronic state of the adsorbed molecules on MoS2-FET using monochromatic radiation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

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

Institution: Tohoku University

2022/04 - 2025/03
Development of Hydrogen Bonding Microscope Utilizing Local Vibrational Spectroscopoy

Komeda Tadahiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2017/06/30 - 2019/03/31

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The vibration spectroscopy is one of the major chemical analysis techniques, which can reveal not only the functional group of the molecule, but also the bonding nature of the crystal. The hydrogen bonding is a critical interaction between molecules which determines the structure of the molecule assembly. In this work we develop a technique to map the hydrogen bonding using the scanning probe microscopes. Instead of observing the morphology of the crystal, we focus on obtaining the inelastic component of the tunneling current. By detecting the vibration mode corresponding to the O-H stretching mode with the effect of the formation of the hydrogen bonding, we successfully mapped the spatial distribution of the hydrogen bonding.
Study on catalytic activity of oxide surface using single molecule labeling and spin polarized tunneling electron spectroscopy

Komeda Tadahiro

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

2016/04/01 - 2019/03/31

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For the chemical reactions on the surfaces, including catalytic reactions, some special sites of the surface like as the lattice defects play a critical role in the determination of the reaction path. However, the ratio of the number of defects against the total number of the surface atoms is tiny, which makes the chemical analysis difficult. STM can give local structure and electronic information. However, compare to the topography and the LDOS information, the spin information provided by ESR and NMR can give us higher sensitivity. In this research, we developed the techniques to identify the spin state of the molecules adsorbed on the surface.
Study of spin dynamics of single molecule magnet at interface

Komeda Tadahiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Tohoku University

2013/06/28 - 2018/03/31

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This group has set the research target on the designing, characterization and control of surfaces, which should provide infrastructure of the 'molecular architect'. Special attentions have been paid for the phenomena formed by the interaction between the molecular spins and the conduction electron. We have demonstrated that the Kondo resonance, which is a spin-screening effect of the conduction electrons for an isolated spin, can be used as a useful technique for characterizing the spin of magnetic molecules. This has been shown for the cases of the Cu corrole molecule and the porphyrin double-decker complex of Tb atom. For the latter, we showed that a dehydrogenation can switch ON/Off of the single molecule magnet (SMM) properties. In addition, we have developed spin-polarized STM (SP-STM) to characterize the direction of the spin in nano materials. This has been applied for the determination of the magnetic anisotropic energy (MAE) of Co bilayer film on Au(111) surface.
Basic Research for Development of Aasymmetric Synthesis by the use of Nanotechnology

TAKAOKA Tsuyoshi, KITAYAMA Takashi

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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Many organic compounds are currently synthesized. Each compound contains a carbon atom to which four different functional group is bonded so that not only the organic compound of interest but structural mirror images of the compound are will also be synthesized. Therefore, we attempted to develop new methods for synthesizing only the organic compound of interest by utilizing the nanotechnology and molecular-beam technology that controls the speed of the molecules of the reaction of the starting materials. In the results of this study, it was found to be sufficiently control the speed of the reaction molecules. In addition, it becomes possible to detect molecules that were the products in the reaction. We think that it is possible to reach the stage of applying the new approach.
Study of molecular friction on surfaces Competitive

TAKAOKA Tsuyoshi

Offer Organization: JSPS

System: Grants-in-Aid for Scientific Research

2009/06 - 2011/03
Characterization of the molecule bridging nano-link electrodes byusing scanning probe microscope

TADAHIRO Komeda, TAKAOKA Tsuyoshi, SAINOO Yasuyuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2005 - 2009

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Electron conductance through a single molecule has attracted attentions because it is possible to control structures, electronic states and functional groups of the molecules. In spite of intensive studies, there are many questions left unanswered. In this study, we tried to measure the path by detecting vibrational modes of the molecules which are caused by the current. We employed scanning tunneling microscope (STM) setting for this purpose, in which the substrate metal surface is an electrode and the STM-tip is the other electrode. The results showed that almost complete vibrational signals of the alkanethiol molecule can be detected. The result was compared with a density-functional calculation, which shows an excellent agreement. In addition, we have found that a certain portion of the current are hopping between neighboring molecules, instead of confined in a single molecule from one electrode to the other.
Dissipation of translational energy of molecules on surfaces

TAKAOKA Tsuyoshi, KOMEDA Tadahiro

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

2006 - 2007

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In 2006, we have performed the experiment about the adsorbate diffusion on solid surfaces by using super sonic molecular beam apparatus combined with ultra high vacuum chamber. From the analysis of the Fourier transformed infrared spectra obtained after a stepped Pt(997) surface was exposed to CO molecules and subsequently to energy-controlled Ne or Ar atoms, the activation energy of the diffusion of CO adsorbed at terrace site and step site were obtained. In 2007, we examined the mechanism of the relaxation of the translational energy of adsorbates on surfaces during the diffusion process by the use of collision induced diffusion phenomena as follows: After a Pt(997) surface was exposed to CO molecules with a coverage of 0.033 ML, it was exposed to Ne or Ar atoms with a translational energy. If the friction applied to CO molecules at terrace site is low, they can migrate long distances after a collision imparts a sufficiently high kinetic energy. If the friction is large, they will stop immediately after the collision. Then, the friction can be estimated from the distribution of CO molecules after the collision with rare gas atoms. However, since the translational energy of CO molecule and its direction depend on the arrangement of the CO molecule and the rare gas atom upon the collision, we employed molecular dynamics calculation and the calculational results were compared with experimental results. From the comparison, the friction coefficient of CO on the Pt surface was estimated to be 8x10^<12> sec^<-1>.
Surface reaction control by the use of Laser detonation and STM observation

TAKAOKA Tsuyoshi, KOMEDA Tadahiro

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

2004 - 2005

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The object of this research is the chemical reaction control by the use high-speed beam of atoms and molecules prepared with Laser detonation technique. To perform the experiment, inlet of gaseous atoms and molecules, Laser detonation apparatus, STM apparatus to observe the surface reaction, and UHV chamber are required. Among them, Laser detonation apparatus and STM were developed in the research. 1. Laser detonation apparatus Laser detonation apparatus is composed of Laser source, mirrors to adjust the Laser direction, a focusing mirror to focus the Laser, gas vessel with a nozzle, pipes through which gases are led. The translational energy of atoms and molecules are measured from the time difference between Laser discharge and time of the arrival of the molecule at the mass spectrometer. Timing control system was developed to measure the time of the arrival of the molecule at the mass spectrometer. 2. STM The species, structure and position of the molecule on the surface after the sample surface is irradiated with high-speed molecules are observed with STM. Position where high-speed molecules are incident on and STM area should be overlapped to observe the STM image after the sample surface are irradiated with the molecules. So, we came up with some ideas. Moreover, piezoelectric parts, which play a very important role in STM system, are easily affected by vibrational noise. However, the noise from pumps is more than we expected. So we came up with some ideas to suppress the noise.
極低エネルギーイオン・原子・分子ビームのケミカルアプリケーション

高岡毅

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

2001 - 2002

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近年、数十eV以下の極低エネルギーイオン・原子・分子ビーム照射が固体表面反応に大きな影響を持つことがわかってきた。粒子が表面に衝突したときにその運動エネルギーが表面上の分子に移動し、表面反応が誘起されるためである。超音速分子ビーム法およびイオンビーム法を用いてエネルギー制御した数百meVから数十eVの原子・分子を表面に照射し、表面反応制御を行うことが本研究の目的である。平成14年度は平成13年度に準備を行ったエネルギー制御機器を用いてエネルギー制御した分子を固体表面に照射し、引き起こされる現象を調べた。 (1)CO/H/Ni(100)表面水素原子を飽和量吸着させたNi(100)表面にCOを供給するとCOはNi原子の直上位地に吸着する。この表面に2eVにエネルギー制御したXe原子を照射するとCOが、直上位置からNi原子二個にまたがる橋かけ位置に移動することがわかった。エネルギー制御した原子衝突により分子の吸着位置が変化する現象を見出すことができた。 (2)NH_3/H_2O/Pt(111)表面 Pt(111)表面上に作成した単結晶氷薄膜表面にアンモニア分子を供給すると氷の最表面に水素結合を介して吸着する。この表面にエネルギー制御したXe原子を照射すると、Xe原子の運動エネルギーが2eV以上ではアンモニア分子と水分子の双方が脱離するが、1-2eVでは、表面のアンモニア分子が氷内部に拡散することがわかった。照射原子のエネルギーにより分子の脱離と内部拡散を制御できることがわかった。
分子凝集体表面におけるエネルギー移動

高岡毅, 楠勲, 佐々木正洋, 山本恵彦, 楠勲, 高岡毅

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

Institution: 東北大学

2000 - 2002

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分子凝集体表面は、自然界で起こる様々な現象と深いかかわりがあり、様々な原子・分子との相互作用を理解することは広く自然現象を理解し、さらに新しい反応経路を見出すことにつながる。とくに分子凝集体表面における原子・分子のエネルギー移動の理解は、分子凝集体表面における物質合成等と直接関連しており、非常に興味深い。赤外分光法(FTIR)、昇温脱離分光(TDS)、および操作プローブ顕微鏡を用いて、分子凝集体表面におけるエネルギー移動に関する以下の成果を得た。 (1)Pt(111)表面上に水分子を4-20層程度成長させた水分子凝集体表面においてアンモニア分子は水分子凝集体表面の水素原子と水素結合を介して吸着する。加熱したときの赤外分光スペクトルの詳細な観測により、(a)アンモニア分子の一部が水分子凝集体内部を拡散してPt(111)表面に到達することを確認し、(b)水分子凝集体表面と水分子凝集体-Pt(111)界面におけるアンモニア分子のポテンシャルエネルギー差を求め、(C)水分子凝集体膜厚が増加するにつれてアンモニア分子が拡散しやすい粒界の面積が減少することを見出した。 (2)仕事関数の減少に伴って表面吸着層におけるメタン分子の直接解離反応が抑制されること、および仕事関数の増大に伴って促進されることを見いだした。これは、真空への電子の拡がりが変化したためにポテンシャル障壁が変化することを示唆するものである。さらに、このことを操作プローブ顕微鏡を用いた微視的計測により確認した。
Manipulation of surface reaction using supersonic molecular beam

KUSUNOKI Isao, TAKAOKA Tsuyoshi

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 - 2001

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The reaction of gas molecules on solid surfaces is very important as it is related with catalysis and production of semiconductor devices. The objects of our research are the elucidation of the relation between the reactions on surfaces and the energy of molecules colliding the surface, and the manipulation of surface reactions with the control of the energy of molecules. We observed the effects of translational energy of gas molecules on the reactions of adsorbates. We used supersonic molecular beam apparatus to control the translational energy of gas molecules, Fourier transformed infrared spectrometer to detect the surface reaction, mass spectrometer to detect the desorbed molecules from the surface. The Ni(100) surface exposed to hydrogen gas and carbon monoxide gas is irradiated with energy controlled Xe atoms. When Xe energy is 0.5 eV, FTIR spectra of the CO/H/Ni(100) surface is not changed. However, when Xe energy is 1.0 eV, adsorption state of CO of the CO/H/Ni(100) changes and a part of CO molecules are desorbed from the surface. This phenomena is explained as the change of adsorption site of CO induced by Xe collision. We could control the desorption reaction which is the most elementary step in surface reactions by controlling the energy of molecules. We would like to develop the control of surface reaction by using energy controlled gas molecules, based on the present results.
分子線による表面反応新機構解明へのアプローチ

高岡毅

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

1999 - 2000

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現在、固体表面でおこる化学反応(表面反応)は、触媒化学工業、半導体産業など多くの分野において中心的な役割を果たしており、応用面からも表面反応を理解することがますます重要になってきている。表面反応が起こるプロセスにおいて、まず気体分子は外部から表面に近づき、表面に衝突し、そして吸着する。この表面における衝突過程が表面反応に大きな影響を持っており、表面反応機構を原子レベルで解明するためには、衝突の効果を考慮する必要がある。研究の目的は、表面反応新機構と考えられる衝突過程の効果を明らかにすることである。実験は、超音速分子線の技術を用いて並進・振動エネルギーを独立に制御した気体分子を試料表面に照射し、形成された表面吸着種や脱離生成物を観測する、という手順で行った。気体分子の運動エネルギーを制御するための分子線作製装置、表面吸着種の吸着状態を調べるための赤外分光装置、脱離生成物を検出するための質量分析計を用いた。あらかじめ水素を飽和量吸着させておいたニッケル表面にさらにCOを吸着した表面を作成し、そこにキセノン原子を照射するとCOの吸着位置の変化することがわかった。キセノン原子との衝突によりCOが得たエネルギーは、COの脱離、解離、振動励起など様々なプロセスを引き起こすために消費される可能性があるが、COの拡散に利用されたと考えられる。ただし、水素が吸着した表面ではCOは吸着位置が変わらないと考えられるので、キセノン原子との衝突でCOが水素原子を取り除いた上で拡散する、という複雑なプロセスが引き起こされていることがわかった。
Development of Total-Reflection Angle Soft X-ray Spectroscopy combined with RHEED

TAKAMI Tomohide, INO Shozo, TAKAOKA Tsuyoshi, KUSUNOKI Isao

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 - 2000

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Ino, one of the investigators on this project, discovered that an X-ray resonance line emitted from a metal thin film with only a layer, at the total-reflection angle, can be detected on observing the pattern of reflection high-energy electron diffraction (RHEED). He named the new surface analysis method "RHEED - Total-Reflection Angle X-ray Spectroscopy (RHEED-TRAXS)". The RHEED-TRAXS is a powerful method to observe RHEED pattern and to analyze the stoichiometry of the surface simultaneously. Moreover, it is a useful method to analyze the depth profile of thin films by changing the incident angle of the electron and the extraction angle of the X-ray. The purpose of this project is to develop the RHEED-TRAXS at the soft X-ray region, i.e., "RHEED - Total-Reflection Angle Soft X-ray Spectroscopy (RHEED-TRASXS)", to show the usefulness of this method for chemical analysis of surface, and to suggest the practical use of RHEED-TRASXS. In 1999, We produced a prototype soft X-ray spectrometer in our machine shop. In this spectrometer, aberration-corrected concave grating with curved and variable spacing grooves was used to split the fluorescent X-ray lines. The splitted X-rays were detected by a multi-channel plate to change the X-ray signal into the visible light. The visible light was detected by a CCD camera out of the vacuum chamber through a viewing port. On the prototype spectrometer system, however, the signal was to weak to detect. Therefore, we planned to make an improved spectrometer to put a CCD camera into the vacuum, detecting the X-rays by the CCD camera directly. In 2000, We bought the CCD camera available to put in vacuum. We produced the modified spectrometer, using the CCD camera in vacuum, also in our machine shop. The modification brought us better S/N ratios of the spectrum. However, bremsstrahlung was overlapped with the spectrum. To conquer the bremsstrahlung will enable us to put the RHEED-TRASXS to practical use.
準安定酸素・窒素励起種ビームによる表面酸化・窒化反応の研究

楠勲, 高岡毅, 高見知秀

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 萌芽的研究

Institution: 東北大学

1998 - 1999

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本研究は、準安定励起種を超高真空下の清浄固体表面に照射し、その表面の酸化・窒化反応の過程を調べることを目的とした。平成11年度は、熱励起したエチレン分子線をシリコン(100)表面に照射したときの炭化反応をX線光電子分光法(XPS)で観察して、分子線照射中心では黒鉛が形成されるのに対して分子線照射近傍では炭化珪素が成長している事がわかった。これは、固体表面における気体との化学反応が気体の供給濃度(フラックス)に依存することを示している。更にこの表面を反射高速電子回折法(RHEED)で詳しく分析し、結晶成長過程を調べた。これは、次世代のシリコンカーバイドを利用したデバイス素子への応用研究という点からも重要である。またダイヤモンドやアルミニウムの表面に窒素イオンビームを照射した際に形成される窒化膜についてもXPS観察を行い、更に電子顕微鏡(SEM)や原子間力顕微鏡(AFM)で表面形態を観察すると共に、電子励起発光についても研究を行った。更に本年度は、励起種ビーム源と超高真空槽を接続するための差動排気真空槽と円筒鏡型電子エネルギー分析器を当研究所内工場で作製した。
固体表面における異種分子間光化学反応機構の研究

高岡毅

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

1997 - 1998

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本研究では、固体表面における光化学反応機構の解明と新たな反応の発見を目標としている。表面反応としては触媒反応とも関係のある2分子反応を考える。2分子間で起こる光化学反応では、少なくとも一方の分子が光励起されるが、本研究では、もう一方の分子を超音速分子線の技術を用いて運動エネルギーを励起することにより、詳しく反応機構を調べ、さらに新たな反応の発見を目指した。反応に関与する2分子の一方を光で励起し、もう一方の運動エネルギーを超音速分子線で励起するが、まず、各励起について知る必要がある。とくに後者の、運動エネルギーを励起した分子と固体表面の反応については、研究例が非常に少ない。そこで、まず、超音速分子線技術を用いて作成した分子と固体表面の吸着反応を調べた。半導体産業において重要なシリコン表面窒化反応に関連してSi(100)表面におけるNH_3分子の吸着について実験を行った。 Si(100)清浄表面にNH_3分子を照射するとNH_3分子がNH_2とHに解離して吸着する。表面が100K程度の低温の場合はSi(100)表面におけるNH_3分子の吸着確率は1.0であるが、温度が上がるにつれて吸着確率が減少することが明らかになった。表面温度が300Kでは吸着確率が0.9であるのに対し、600Kでは0.4と減少する。こういった実験結果を考察することにより、分子は表面に照射されると一旦表面近傍の準安定状態に捕捉され、その後に吸着状態に入ること、またそれら状態間のエネルギー関係などを明らかにした。超音速分子線技術を用いて作成した分子と固体表面の反応について調べた上で、次の段階として目標とした、光励起と運動エネルギーの励起を同時に行う実験を行う予定であったが、残念ながら運動エネルギーの励起に関する実験を行うにとどまった。
Development of an apparatus for the analysis of chemical reactions on surfaces equipped with a Helium beam apparatus.

KUSUNOKI Isao, RANGE Heiko, TAKAOKA Tsuyoshi

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

1995 - 1997

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The purpose of this project is to develop an apparatus with which surface reactions and surface structures can be observed, by applying the techniques of supersonic molecular beam. With the apparatus, we want to control the surface reaction by varying the translational energy of molecules impinging on the surface, and observe the property of the reaction using the Helium beam scattering technique. The apparatus is composed of a molecular beam apparatus, a manipulator with which the position of the sample is controlled, a rotatable mass spectrometer, a vacuum chamber and a pumping system.The molecular beam apparatus is working well in point of the triply differential pumping and the control of the translational energy of molecules. As to the manipulator, by the use of stepping motors for use in UHV,the sample can be controlled with high precision which is needed for the experiment of He beam scattering. The rotatable mass spectrometer and a double differential pumping system constructed to reduce the background gas are rotated around the sample. By performing the experiments described below, we ascertained the enough performance of the apparatus. 1.We performed He diffraction experiment. We observed the diffraction pattern corresponding to LiF (100) surface structure in the angular distribution of He atoms scattered from the surface when He beam is directed to the sample. We confirmed that the surface structure is measured by the use of He beam. 2.We observed that the intensity of specular reflection of He beam from Ni (100) surface decrease with increasing the amount of the adsorbate. 3.We observed spectra of submonolayr CO and NH_3 adsorbed on Ni (100) surface.
水素結合型分子クラスターの固体表面衝突による分解反応

楠勲, 高岡毅

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 東北大学

1995 - 1995

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本研究では、純エチレンと純アンモニアガスを用いてノズルビームを作成し、室温でのSi(100)表面に照射した。ビーム中にはこれらのガス分子のクラスターが含まれている事が質量分析計で確認できた。室温のSi表面上でエチレンおよびアンモニア分子が化学吸着することは昇温脱離法で確かめられた。また、吸着した化学状態をX線光電子分光(XPS)でも調べる事が出来た。ガスフロー法では、これらの分子は室温表面にあまり吸着しない事から、クラスターを含む分子線照射によって吸着が促進された可能性がある。エチレン分子は非解離でSi(100)表面に化学吸着することが定説であるが、本研究ではClsのXPSスペクトルから一部解離吸着している可能性もある。クラスターの持つ運動エネルギーが寄与していることが十分に考えられる。これらの点は今後、実験を継続して明らかにしてゆく予定である。さらに、Si表面の温度を上げ、エチレンとアンモニア分子線照射による表面の炭化反応と窒化反応の研究を行った。反応の進行状態をいろいろの表面温度においてXPS法を用いて追跡した。表面温度や露出時間を変えると、ls電子の結合エネルギーにシフトがみられ、炭素や窒素原子の化学状態が異なる事が見て取れる。室温での吸着では、いずれもHが結合した分子の状態であるが、600℃以上の高温ではHは分解脱離して表面上では留まっていない。したがって、Si-CやSi-Nの状態を反映したXPSスペクトルが得られた。この実験によって、エチレンやアンモニアなどの水素結合による分子クラスターと固体表面の相互作用を研究する端緒を開いた。
Effect of kinetic and vibrational energy of molecular beam on surfase reactions

KUSUNOKI Isao, TAKAGAKI Tsuyoshi

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 - 1994

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For study of reaction mechanisms of gaseous molecule and solid surface, we have constructed a new molecular beam apparatus which is attached to a multi-surface analysis system. In the present work, carbonization and nitridation of Si surface have been investigated. For the carbonization an ethylene beam was irradiated on the clean and heated Si surfaces. After the reaction the surfaces were analyzed by low energy electron differaction (LEED) and X-ray photoelectron spectroscopy (XPS). The reaction occured above 600ﾟC.The reaction rate increacsed with temperature up to 675ﾟC,but it decreased above the temperature. In an initial stage of the reaction a change of the LEED patern was observed, which means that the deposited C atoms were regularly arranged on the Si (100) surface. The reactive C and Si atoms were supplied on the growing carbide layr by the ethlene beam and the outdiffusion of Si atoms in the substrate, respectively. At the lower temperatures than 675ﾟC the outdiffusion of Si is the rate-determining step of the carbide layr growth. At the higher temperatures, the rate of the C supply is the rate determing step. The C supply rate may decrease with the temperatre due to the residence time the carbide layr was nearly unity at 675ﾟC,which suggests that the both supplies were balanced at the temperature. For the nitridation we have used a N_2^+ ion beam of energy between 100 and 1000eV.The chemical change of the surface layr during the beam irradiation was studied by XPS.At the lower energies of 100-200eV a very thin film of a nearly stoichimetric compound Si_3N_4 was formed, but at the higher energies the nitride layrs contained many defects. The defects were partially dimished by annealing.

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