SHIMIZU, Tomoko

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics 基礎理工学専攻 (Yagami)

Position

Associate Professor

Related Websites

Remarks

Tomoko K. Shimizu

External Links
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Career 【 Display / hide 】

  • 2007.07
    -
    2009.03

    RIKEN, Surface Chemistry Laboraboty, Associate Researcher

  • 2009.04
    -
    2010.03

    RIKEN, Surface Chemistry Laboraboty, Special Postdoctoral Researcher

  • 2010.04
    -
    2012.03

    RIKEN, Surface and Interface Science Laboraboty, Special Postdoctoral Researcher

  • 2012.04
    -
    2013.03

    RIKEN, Surface and Interface Science Laboraboty, ASI Researcher

  • 2013.04
    -
    2015.03

    National Institute for Materials Science, Atomic Force Probe Group, Nano Characterization Unit, Advanced Key Technologies Division, Senior Researcher

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Academic Background 【 Display / hide 】

  • 1998.04
    -
    2002.03

    Keio University, Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics

    University, Graduated

  • 2002.08
    -
    2004.05

    University of California, Berkeley, College of Engineering, Department of Materials Science and Engineering

    United States, Graduate School, Completed, Master's course

  • 2004.08
    -
    2007.05

    University of California, Berkeley, College of Engineering, Department of Materials Science and Engineering

    United States, Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 学士（工学）, Keio University, 2002.03

  • M. Sci., University of California, Berkeley, 2004.05

  • Ph.D., University of California, Berkeley, Coursework, 2007.05

    Water Adsorption on Ruthenium (0001) Studied by Scanning Tunneling Microscopy

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Research Areas 【 Display / hide 】

  • Nanotechnology/Materials / Nanometer-scale chemistry

  • Nanotechnology/Materials / Nanostructural physics

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

  • Nanotechnology/Materials / Fundamental physical chemistry

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Research Keywords 【 Display / hide 】

  • Atomic Force Microscopy

  • Functional organic thin films

  • Surface Science

  • Scanning Tunneling Microscopy

  • Scanning Probe Microscopy

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Books 【 Display / hide 】

  • エンジニアのための物理化学

    川合眞紀, 宗像利明, 清水 智子, 東京化学同人, 2010

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Papers 【 Display / hide 】

  • Unveiling the surface of carbon black via scanning probe microscopy and chemical state analysis

    Mari Isagoda, Yuto Ariyoshi, Yuto Fujita, Sae Endo, Takayuki Aoki, Rui Tang, Hirotomo Nishihara, Tomoko K. Shimizu

    Carbon Trends 16   100378-1 - 100378-10 2024.07

    Research paper (scientific journal), Joint Work, Last author, Accepted

    　View Summary

    Carbon black (CB) has wide range of industrial applications, including in the manufacturing of automobile tires, rubber products, inks, and plastics. To improve the properties of the target products and establish recycling systems, it must be fully characterized. However, characterization of CB is challenging owing to its structural complexity and the limitation of conventionally used experimental techniques, especially for surface structures at the nanoscale. In this study, we characterized the surface structures of two commercial CB via atomic force and scanning tunneling microscopy. Analysis of well-dispersed aggregates on atomically flat solid surfaces revealed primary particles of diverse sizes. The particle surfaces lacked edges, grooves, and steps that should be observed between stacked graphene sheets, which contradicts the widely accepted crystallite model. Observed images suggest that the graphene sheets exhibit a size distribution, inferring that multiple non-uniformly sized small graphene sheets are stacked turbostratically, with each sheet displaying a localized curvature rather than the ideal planar form. Varying size of sheets and curvature indicate the presence of a decent number of edges terminated with hydrogen and oxygen-containing functional groups. This interpretation was corroborated by conventional spectroscopic techniques: Raman spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and infrared absorption spectroscopy.

  • Modification of transition pathways in polarized resonance Raman spectroscopy for carbon nanotubes by highly confined near-field light

    Yuto Fujita, Norihiko Hayazawa, Maria Vanessa Balois-Oguchi, Takuo Tanaka, Tomoko K. Shimizu

    Journal of Applied Physics 135 ( 19 ) 193101-1 - 193101-8 2024.05

    Research paper (scientific journal), Joint Work, Last author, Accepted

    　View Summary

    We observed a modification of transition pathways in polarized resonance Raman spectroscopy during tip-enhanced Raman spectroscopy (TERS) analysis of metallic carbon nanotubes (CNTs). At a spatial resolution reaching up to the sub-nanometer regime, the signal intensity of the typical D-band is observed to be even higher than the intensity of the G-band all over the probed CNTs in TERS imaging. The measured D-band is attributed to the non-vertical transitions of electrons in k-space that are facilitated by highly confined near-field light at the tip–sample junction of our scanning tunneling microscope based TERS system. The D-band signal was observed even when the CNTs were excited by light polarized perpendicular to the tube axis that corresponds to electronic excitations between different cutting line numbers of a CNT. By combining the electron pathways brought about by both the near-field light and its polarization, we found a unique optical transition of electrons of CNTs in near-field Raman spectroscopy.

  • Classification of Adsorbates in Scanning Tunneling Microscopy Images of Fe3O4(111) Surfaces Exposed to Water and Carbon Monoxide

    Asa Kiuchi, Yaoto Eda, Yousoo Kim, Tomoko K. Shimizu

    Surface Science 750   122582-1 - 122582-9 2024.05

    Research paper (scientific journal), Joint Work, Last author, Accepted

    　View Summary

    Understanding the structure of catalyst surfaces with adsorbed molecules is key to improving catalyst design. Scanning tunneling microscopy (STM) allows the observation of adsorption states and sites and provides insights into diffusion and desorption processes; however, the presence of multiple types of molecules on the surface presents challenges such as the identification of species and verification of reaction progress, particularly at room temperature or higher. In this study, we develop a protocol for the height classification analysis of STM images using the Watershed algorithm. This method is applied to a system involving the co-adsorption of H the Fe 3 O 4 2 O and CO on (111) surface, which represents the beginning of the water-gas shift reaction. Water molecules and dissociated OH species were identified in STM images of the Fe 3 O 4 (111) surface following the adsorption of water. Furthermore, gradual changes in the types of surface species were observed upon exposure of the surface to CO, indicating reaction progression. Our observations suggest that CO may react with molecular water rather than with dissociated OH on Fe sites. Despite its simplicity, the height classification analysis effectively identifies changes in the adsorbates on the catalyst surface. This method can be extended to other catalyst surfaces with adsorbed gasses.

  • Stability and formation process of hydrogen-bonded organic porous thin films: A molecular dynamics study

    Kazuma Matsui, Hiroshi Watanabe, Tomoko K. Shimizu

    AIP Advances 12 ( 10 ) 105109-1 - 105109-7 2022.10

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted

    　View Summary

    Molecular dynamics simulation using the reactive force field was performed to investigate the stability and formation mechanisms of organic porous thin films made of 1,3,5-tris(4-carboxyphenyl) benzene (BTB) molecules fabricated at the air/water interface. A single-layer honeycomb structure is found to be unstable, whereas thicker films are stable, which is consistent with experimental findings. The slight corrugation of the existing film produces local charge variation that attracts isolated molecules via the Coulomb interaction. When the isolated molecule approaches the film, a hydrogen bond is formed, and then the molecule adjusts the adsorption configuration by itself to maximize both horizontal and vertical intermolecular interactions. The key to the initial hydrogen bond formation is suggested to be the density of the molecules provided in the system as well as the spontaneous alignment of the BTB molecules to the solution/water interface. Our study showed that the BTB film is stable, and the molecules are self-assembled without external forces in the quasi-two-dimensional system. These results suggest that the dominant factor for the film formation at the air/water interface is interactions among BTB molecules and confinement to the two-dimensional space.

  • Evidence of One-Dimensional Channels in Hydrogen-Bonded Organic Porous Thin Films Fabricated at the Air/Liquid Interface

    Kanae Yamanami, Yuto Fujita, Kazuma Matsui, Ryu Asari, Tomoko Kusawake, Tomoko K. Shimizu

    Langmuir 38 ( 5 ) 1910 - 1914 2022.02

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted,  ISSN  07437463

    　View Summary

    Visualization of periodically aligned pores in organic frameworks is a key to the understanding of their structural control. Comparing to monolayer-thick self-assembled molecular networks, real-space nanoscale characterization of thicker films, especially obtaining information on the stacking manner of molecules is challenging. Here, we report an atomic force microscopy study of hydrogen-bonded thin films fabricated at the air/liquid interface. The presence of one-dimensional channels is evidenced by resolving honeycomb structures over the films with the thickness variation of more than several nanometers. We also demonstrate that the film thickness can be controlled by the ratio of mixed solvent rather than the surface pressure during the fabrication at the air/liquid interface.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • 慶應義塾大学理工学部 物理情報工学科 清水研究室（研究紹介）

    清水智子

    応用物理学会薄膜表面分科会ニュースレター No.176   45 - 47 2021.09

    Single Work

  • 高解像度走査型プローブ顕微鏡による炭素材料の評価

    Tomoko K. Shimizu

    Tanso 285   204 - 209 2018.12

    Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

  • 分子の内部構造を見る原子間力顕微鏡技術

    清水智子, Oscar Custance

    表面科学 37 ( 7 ) 320 - 325 2016.07

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work

  • 第２部　計測テクノロジー最前線 第１章　原子一つにせまるテクノロジー ２　原子間の力をはかる　－ＡＦＭ－

    清水智子, クスタンセ オスカル

    NIMS調査分析室レポート 材料イノベーションを加速する先進計測テクノロジーの現状と動向-物質・材料研究のための先端計測テクノロジー (物質・材料研究機構)     42 - 51 2016.01

    Article, review, commentary, editorial, etc. (bulletin of university, research institution), Joint Work

  • フォトクロミック分子を金属表面に乗せると？

    清水 智子

    日本化学会研究会「低次元系光機能材料研究会」ニュースレター 10   6 - 8 2016.01

    Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

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Presentations 【 Display / hide 】

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 磁鉄鉱単結晶およびナノ粒子表面へのガス吸着状態の観察と検証

    2021.04
    -
    2022.03

    公益財団法人東京応化科学技術振興財団, 第35回研究助成, Other, Principal investigator

  • 単分子表面分光手法を用いた塵表面における反応素過程の分子レベル解明

    2020.11
    -
    Present

    科学研究費補助金, 学術変革領域研究(A), Research grant, Coinvestigator(s)

  • 走査型プローブ顕微鏡によるカーボンブラック表面の可視化

    2020.07
    -
    2021.03

    慶應義塾先端科学技術研究センター, 2020 年度指定研究プロジェクト産学連携支援（単年度）, Joint research, Principal investigator

  • プラズモン効果による単分子フォトクロミック反応の実現検証

    2020.04
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    2023.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

  • 機能性ナノ材料の評価に向けたマルチスケール走査型プローブ顕微鏡の開発

    2019.04
    -
    2021.03

    公益財団法人　高橋産業経済研究財団, Other, Principal investigator

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Awards 【 Display / hide 】

  • 平成30年度科学技術分野の文部科学大臣表彰若手科学者賞

    2018.04, 文部科学省

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Courses Taught 【 Display / hide 】

  • SURFACE AND INTERFACE SCIENCE

    2024

  • SOLID STATE SCIENCE

    2024

  • SOLID STATE PHYSICS 1

    2024

  • PRESENTATION TECHNIQUE

    2024

  • LABORATORY IN SCIENCE

    2024

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Memberships in Academic Societies 【 Display / hide 】

  • American Chemical Society, 

    2023.05
    -
    Present

  • The Japan Society of Applied Physics, 

    2021.01
    -
    Present

  • 日本表面真空学会, 

    2018.04
    -
    Present

  • 日本化学会, 

    2014
    -
    Present

  • 日本物理学会, 

    2010.03
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2024.04
    -
    Present

    協議員, 公益社団法人　日本表面真空学会

  • 2023.12
    -
    Present

    プログラム委員, The 15th International Symposium on Atomic Level Characterizations for New Materials and Devices (ALC’24)

  • 2023.04
    -
    Present

    関東支部幹事役員庶務担当, 公益社団法人　日本表面真空学会

  • 2023.04
    -
    Present

    次世代ナノプローブ技術委員会委員, 一般財団法人　青葉工学振興会

  • 2023.04
    -
    Present

    幹事, 日本応用物理学会薄膜・表面物理分科会

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