Details of the Researcher

PHOTO

Yoshinari Kimura
Section
Graduate School of Engineering
Job title
Assistant Professor
Degree

  • Master (Kobe University)

  • Doctor (Kobe University)

e-Rad No.
30907043

Research History 3

  • 2021/05 - Present
    Tohoku University　Graduate School of Engineering　Assistant professor

  • 2017/04 - 2021/04
    Kobe University　Graduate School of Engineering

  • 2015/04 - 2017/03
    キヤノン株式会社　社員

Education 4

  • Kobe University　Graduate School of Engineering　Department of Electrical and Electronic Engineering

    2017/10 - 2020/09

  • Kobe University　Graduate School of Engineering　Department of Electrical and Electronic Engineering

    2013/04 - 2015/03

  • Kobe University　Faculty of Engineering　Department of Electrical and Electronic Engineering

    2009/03 - 2013/03

  • 桃山学院高等学校

    2006/04 - 2009/03

Professional Memberships 2

  • 日本機械学会

  • 応用物理学会

Research Areas 3

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electric/electronic material engineering /

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine materials and mechanics /

  • Nanotechnology/Materials / Inorganic materials /

Awards 1

  1. 2024年度日本機械学会奨励賞（研究）

    2025/04　日本機械学会　酸化物半導体ナノワイヤの作製とその溶液センサ応用の研究

Papers 26

  1. Experimental evaluation of the mechanical properties of iron oxide nanowires for chemical sensor applications

    Yoshinari Kimura, Sota Osari, Keiichi Shirasu, Hironori Tohmyoh

    Applied Surface Science Advances　34　101001-101001　2026/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.apsadv.2026.101001 　

    ISSN： 2666-5239

  2. Hierarchical Metal–Oxide–Semiconductor Nanowire-on-Microwire Structures for Room-Temperature Detection of Biomarker Molecules in Aqueous Solution Peer-reviewed

    Yoshinari Kimura, Hironori Tohmyoh

    IEEE Sensors Letters　10　(7)　2001704-2001704　2026/07

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lsens.2026.3704944 　

    eISSN： 2475-1472

  3. Design Concept of Adjustable Thermoelectric Generators Comprising Multiple Thermoelectric Modules: Output Power and Internal Resistance Control

    Hironori Tohmyoh, Yoshinari Kimura, Masanari Imada

    International Journal of Energy Research　2026　(1)　2026/01

    Publisher: Wiley

    DOI： 10.1155/er/7592297 　

    ISSN： 0363-907X

    eISSN： 1099-114X

    More details Close

    This paper reports on a design concept for an adjustable thermoelectric generator (TEG) comprising multiple thermoelectric (TE) modules. This TEG allows for controlling the output power and internal resistance of the TEG by adjusting the number of TE modules connected. First, plate‐type TE modules were fabricated by depositing an Al layer on a Fe plate (using easily available materials). TEGs were fabricated by connecting up to eight modules by alligator clips, and the TE performance of TEGs with different numbers of modules was evaluated. It was verified experimentally that the Seebeck coefficient of the TEGs increased in proportion to the number of TE modules. However, the maximum output power did not do so due to the high connection resistance of the alligator clips. Next, the connection resistance between Fe and Al plates was measured when the plates were stacked in various ways and found that Cu plates (sandwiched between the plates and fixed with a jig) realized low connection resistance. Based on the above experimental results, the relationships between TE performance of the TEGs and the number of TE modules connected were predicted by a theoretical model considering the connection resistance between TE modules. This paper introduces the design concept of a TEG, which controls output power and internal resistance by adjusting the number of TE modules to take into account the resistance of the device being powered.

  4. Welding of thin Pt wires by instantaneous current application

    Hironori Tohmyoh, Taito Iwabuchi, Yoshinari Kimura

    Materials Today Communications　49　113726-113726　2025/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.mtcomm.2025.113726 　

    ISSN： 2352-4928

  5. Modulation of interface states at Fe/Al interface for thermoelectric module applications Peer-reviewed

    Yoshinari Kimura, Kohei Utsumi, Hironori Tohmyoh

    Journal of Applied Physics　138　(16)　2025/10/22

    Publisher: AIP Publishing

    DOI： 10.1063/5.0292612 　

    ISSN： 0021-8979

    eISSN： 1089-7550

    More details Close

    Metal/metal interfaces play a crucial role in the practical applications of common metallic thermoelectric modules (TEMs), which economically convert heat to electricity in an environmentally friendly manner. The effect of modulation of Fe/Al interface states, introduced by the application of large bias currents, on the thermoelectric properties of the Fe/Al-based TEMs was investigated. The Seebeck coefficients of TEMs after applying bias currents in the Fe → Al and Al → Fe directions increased from 2.1 and 2.5 to 2.5 and 2.9 μV K−1, respectively, with prolonged applying them. The densities of Fe/Al interface states, calculated based on the capacitance– and conductance–frequency characteristics of the only Fe/Al interfacial samples, decreased from 2.6 × 1014 to 1.8 × 1011 cm−2 eV−1 with prolonged applying the bias currents. These results indicate that the TEMs’ Seebeck coefficients and the densities of Fe/Al interface states were negatively correlated. To enhance Seebeck coefficients, reductions in densities of interface states between dissimilar metals provide an alternative strategy for designing high-performance metallic TEMs.

  6. ZnO-Based Chemiresistive Ion Sensors for Identifying Alkali Metal and Alkaline Earth Metal Ions in Solutions Peer-reviewed

    Yoshinari Kimura, Hironori Tohmyoh

    IEEE Sensors Letters　9　1-4　2025/08

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lsens.2025.3586242 　

    eISSN： 2475-1472

  7. Metal-Oxide-Semiconductor Nanostructure/NiO Microparticle Heterojunctions Formed on Metallic Foils for Sensitive Chemiresistive Ion Sensors Peer-reviewed

    Yoshinari Kimura, Hironori Tohmyoh

    ACS Omega　2025/06/20

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsomega.5c02828 　

    ISSN： 2470-1343

    eISSN： 2470-1343

  8. Experimental relationship between the Seebeck and Peltier effects in thermoelectric modules based on Fe and Al metals Peer-reviewed

    Yoshinari Kimura, Kohei Utsumi, Hironori Tohmyoh

    Applied Thermal Engineering　255　124009-124009　2024/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.applthermaleng.2024.124009 　

    ISSN： 1359-4311

  9. Effect of oxygen content in CuO x nanofilms on chloride ion detection for ion sensor applications Peer-reviewed

    Yoshinari Kimura, Michihiro Sasaki, Hironori Tohmyoh

    Japanese Journal of Applied Physics　63　(9)　095502-095502　2024/09/02

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ad7342 　

    ISSN： 0021-4922

    eISSN： 1347-4065

    More details Close

    Abstract Sensors for detecting chloride ions have been required for routine monitoring of industry and human health. This study proposes a concept of an ion sensor based on CuO x nanofilms with different oxygen contents. The CuO x -based sensors exhibited an increase in DC current for those with low oxygen content and a decrease for those with high oxygen content following exposure to a chloride ion solution. AC impedance analysis suggested differential reactions of chloride ions in the bulk and surface regions of CuO x , dependent on the oxygen content. For the CuO x -based sensors with a ratio of 0.78 oxygen to copper atoms at chloride ion concentrations of 10−1000 ppm, the sensitivity in the bulk region calculated from AC impedance was 61−2926, which was higher than the sensitivity of 1.3−2.6 calculated from DC impedance. Finally, CuO x -based sensors demonstrated identifiability for chloride ions compared to sodium and calcium ions.

  10. Nanostructure-Based Solution Sensor Fabricated with p-CuOx/n-TiO2 Nanojunctions To Identify Species and Concentrations of Alcohol Molecules

    Yoshinari Kimura, Hironori Tohmyoh

    Langmuir　40　(1)　1079-1086　2023/12/27

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.langmuir.3c03330 　

    ISSN： 0743-7463

    eISSN： 1520-5827

  11. Resistive Ion Sensors Based on Metal–Oxide–Semiconductor Nanostructures Formed by Heating Metal Foil Peer-reviewed

    Yoshinari Kimura, Hironori Tohmyoh

    IEEE Sensors Letters　7　(9)　1-4　2023/09

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lsens.2023.3307098 　

    eISSN： 2475-1472

  12. Fabrication of Cu oxide/TiO2 p–n nanojunctions by stress-induced migration

    Yoshinari Kimura, Hironori Tohmyoh

    Journal of Applied Physics　133　(11)　114302-114302　2023/03/17

    Publisher: AIP Publishing

    DOI： 10.1063/5.0136274 　

    ISSN： 0021-8979

    eISSN： 1089-7550

    More details Close

    Many Cu oxide/TiO2 p–n nanojunctions were fabricated by introducing the concept of using n-type TiO2 layers to the fabrication method of p-type Cu oxide nanowires by stress-induced migration. Cu oxide/TiO2 nanojunctions were formed along with nanowire growth by heating a Cu thin film with TiO2 passivation layers of different thicknesses. The presence of p–n nanojunctions at the Cu oxide/TiO2 interface was analyzed by current–voltage and electrochemical impedance measurements. The sheet resistance of the samples decreased as the TiO2 thickness increased from 0 to 20 nm and then increased with increasing TiO2 thickness. The shapes of Nyquist plots consisted of two semicircles, one distorted semicircle, and two distorted semicircles for samples without a TiO2 layer, with 2 or 20 nm TiO2 layer, and with 100 or 200 nm TiO2 layer, respectively. The TiO2 thickness dependence of these electrical characteristics suggests that electrical conduction in the sample heated with a TiO2 passivation layer was through the Cu oxide grain surface, Cu oxide/TiO2 interface, and Cu oxide nanowires. In the equivalent circuit representing this electrical conduction, the capacitance values at the Cu oxide/TiO2 interface decreased with increasing TiO2 thickness. These results suggest that a thicker TiO2 passivation layer led to the formation of more p–n nanojunctions at the Cu oxide/TiO2 interface.

  13. Copper Oxide Solution Sensor Formed on a Thin Film Having Nanowires for Detecting Ethanol in Water

    Yoshinari Kimura, Hironori Tohmyoh

    Langmuir　38　(38)　11573-11580　2022/09/27

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.langmuir.2c01160 　

    ISSN： 0743-7463

    eISSN： 1520-5827

  14. Effect of the geometric shape of nanostructures formed on Cu oxide thin films by the stress-induced migration on electrical characteristics

    Yoshinari Kimura, Hironori Tohmyoh

    Scripta Materialia　210　2022/03/15

    DOI： 10.1016/j.scriptamat.2021.114469 　

    ISSN： 1359-6462

  15. Energy distribution of interface states generated by oxygen plasma treatment for control of threshold voltage in pentacene thin-film transistors

    Yoshinari Kimura, Yoshiaki Hattori, Masatoshi Kitamura

    Journal of Physics D: Applied Physics　53　(50)　2020/12

    DOI： 10.1088/1361-6463/abb554 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  16. Nucleation Density and Shape of Submonolayer Two-Dimensional Islands of Diphenyl Dinaphthothienothiophene in Vacuum Deposition

    Yoshiaki Hattori, Yoshinari Kimura, Masatoshi Kitamura

    Journal of Physical Chemistry C　2020

    DOI： 10.1021/acs.jpcc.9b08628 　

    ISSN： 1932-7447

    eISSN： 1932-7455

  17. Wide-range work function tuning in gold surfaces modified with fluorobenzenethiols toward application to organic thin-film transistors

    Takumi Yoshioka, Hiroki Fujita, Yoshinari Kimura, Yoshiaki Hattori, Masatoshi Kitamura

    Flexible and Printed Electronics　5　(1)　2020

    DOI： 10.1088/2058-8585/ab71e3 　

    eISSN： 2058-8585

  18. Evaluation of organic metal-oxide-semiconductor capacitors based on a distributed constant circuit

    Yoshinari Kimura, Yoshiaki Hattori, Masatoshi Kitamura

    Japanese Journal of Applied Physics　59　(3)　2020

    DOI： 10.35848/1347-4065/ab755b 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  19. The growth mechanism and characterization of few-layer diphenyl dinaphthothienothiophene films prepared by vacuum deposition

    Yoshiaki Hattori, Yoshinari Kimura, Takumi Yoshioka, Masatoshi Kitamura

    Organic Electronics　74　245-250　2019/11

    DOI： 10.1016/j.orgel.2019.07.014 　

    ISSN： 1566-1199

  20. Data on optical microscopy and vibrational modes in Diphenyl Dinaphthothienothiophene thin films

    Yoshiaki Hattori, Yoshinari Kimura, Takumi Yoshioka, Masatoshi Kitamura

    Data in Brief　26　2019/10

    DOI： 10.1016/j.dib.2019.104522 　

    eISSN： 2352-3409

  21. Voltage and Frequency Dependence of Capacitance Characteristics in Organic MOS Capacitors

    Yoshinari Kimura, Yoshiaki Hattori, Masatoshi Kitamura

    2019 Compound Semiconductor Week, CSW 2019 - Proceedings　2019/05

    DOI： 10.1109/ICIPRM.2019.8819249 　

  22. Nucleation and shape of 2D islands of DPh-DNTT thin-films prepared by vacuum evaporation

    Yoshiaki Hattori, Yoshinari Kimura, Masatoshi Kitamura

    2019 Compound Semiconductor Week, CSW 2019 - Proceedings　2019/05

    DOI： 10.1109/ICIPRM.2019.8819052 　

  23. A ring oscillator consisting of pentacene thin-film transistors with controlled threshold voltages

    Hajime Takahashi, Masatoshi Kitamura, Yoshiaki Hattori, Yoshinari Kimura

    Japanese Journal of Applied Physics　58　(SB)　2019

    DOI： 10.7567/1347-4065/ab01d3 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  24. Application of pentacene thin-film transistors with controlled threshold voltages to enhancement/depletion inverters

    Hajime Takahashi, Yuki Hanafusa, Yoshinari Kimura, Masatoshi Kitamura

    Japanese Journal of Applied Physics　57　(3)　2018/03

    DOI： 10.7567/JJAP.57.03EH03 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  25. Threshold voltage control in dinaphthothienothiophene-based organic transistors by plasma treatment: Toward their application to logic circuits

    Asahi Kitani, Yoshinari Kimura, Masatoshi Kitamura, Yasuhiko Arakawa

    Japanese Journal of Applied Physics　55　(3)　2016/03

    DOI： 10.7567/JJAP.55.03DC03 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  26. Operational stability in pentacene thin-film transistors with threshold voltages tuned by oxygen plasma treatment

    Yoshinari Kimura, Masatoshi Kitamura, Asahi Kitani, Yasuhiko Arakawa

    Japanese Journal of Applied Physics　55　(2)　2016/02

    DOI： 10.7567/JJAP.55.02BB14 　

    ISSN： 0021-4922

    eISSN： 1347-4065

Show all ︎Show first 5

Presentations 1

  1. Development of a Chemiresistive Sensor Based on Metal-Oxide-Semiconductor Nanostructures for Wearable Detection of Ions in Solutions Invited

    Yoshinari Kimura

    The 15th International Conference on Flexible and Printed Electronics (2025 ICFPE)　2025/09/17

Research Projects 4

  1. Development of a self-powered chemical sensor using surface state control of one-dimensional oxide semiconductor

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2025/04 - 2027/03

  2. Innovative Chemical Sensor Based on Interface State Control of Oxide Semiconductor Nanowires with PN Junction

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2023/04 - 2025/03

  3. 多変量解析法を用いた酸化物半導体ナノワイヤ形状による分子識別技術の開発

    木村 由斉

    Offer Organization: 公共財団法人住友財団

    System: 2022年度基礎科学研究助成

    2022/11 - 2023/10

  4. 有機半導体薄膜作製の先端技術「インクジェット法」を導入した学生実験の開発

    木村 由斉

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究

    Category: 奨励研究

    Institution: 神戸大学

    2019 - 2019

    More details Close

    学生の研究に対する意識向上を目的として, 有機半導体薄膜作製技術である「インクジェット法」を用いた学生実験を導入するための予備実験を実施した. 実験初学者である学生と共に, 有機半導体を使用した有機トランジスタを作製し, 素子の電気特性を評価した. 学生が作製した素子の多くは, 基板表面に存在する多数の傷が原因で, トランジスタとして動作しなかった. 学生の未熟な作業スキルを考慮した上で, 素子の動作の再現性を担保できるような実験手順の組み立てが必要であることが分かった.