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, 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 】

  • Surface and Interface Science

  • Scanning Probe Microscopy

  • Scanning Tunneling Microscopy

  • Atomic Force Microscopy

  • Functional organic thin films

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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, 2010.01

    Original author： JOHN T.YATES, JR.・J.KARL JOHNSON

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Papers 【 Display / hide 】

  • Re-examining tip-enhanced Raman signals at high spatial resolution under ambient conditions via graphene nanobubbles

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

    Appl. Spectrosc.  2025.09

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

    　View Summary

    High spatial resolution tip-enhanced Raman spectroscopy (TERS) measurements were carried out under ambient conditions on graphene nanobubbles with various associated structural features. The resulting signals were analyzed with consideration of the characteristic features inherent to high resolution TERS. Compared to flat graphene regions, nanobubbles and their associated nanoconvex pinning sites demonstrated enhanced TERS signals, attributed to the efficient coupling between the strong tip-enhanced electric field and out-of-plane deformations in graphene. Strong coupling with highly confined near-field light activates the D bands even in the absence of defects, with intensity depending on the degree of deformations. While the D band is observed across the nanobubbles, some local regions exhibit a weaker D band intensity compared to the surrounding areas. Given the finite number of hexagonal lattices within the area of highly confined near-field, this reduction in intensity is likely to result from defects that cause missing hexagonal lattices. These findings highlight the capability of near-field induced Raman signals in probing high resolution features of nanomaterials even under ambient conditions, providing deeper insights into their characteristics in situ.

  • Simultaneous Ring-Opening and Dehydrogenation of Diarylethene Induced by Tunneling Electrons

    Hirokazu Sato, Taehwan Lee, Minhui Lee, Emiko Kazuma, Yousoo Kim, Jaehoon Jung, Kyoung Chul Ko, Tomoko K. Shimizu

    ChemPhysChem 26 ( 7 ) e202400988 2025.01

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

    　View Summary

    Understanding the reversible transformation between two isomeric states of organic molecules under external stimulation is essential for advancing single-molecule device development. Photochromic diarylethene (DAE) derivatives are promising candidates for single molecular switching elements. This study investigates the single-molecule reactions of the closed-form isomer of a DAE derivative on Cu(111) using scanning tunneling microscopy (STM). A novel ring-opening pathway, distinct from the well-known photochromic isomerization, was discovered. Electron injection into the lowest unoccupied molecular orbitals induces the sequential anchoring of molecules to the substrate through the dehydrogenation of a methyl group at the 2-position of the thiophene ring. This mechanism was revealed by density functional theory calculations and STM simulations. The adsorption configurations for singly and doubly dehydrogenated DAEs were identified. Based on these findings, a new reaction mechanism extending beyond reversible isomeric reactions is proposed for DAE on Cu(111). The present work establishes a novel framework for future studies on single-molecule switching phenomena on metal substrates.

  • Structure and defect identification at self-assembled islands of CO2 using scanning probe microscopy

    Oscar Custance, Emiliano Ventura-Macias, Oleksandr Stetsovych, Carlos Romero-Muñiz, Tomoko K. Shimizu, Pablo Pou, Masayuki Abe, Hironobu Hayashi, Tadakatsu Ohkubo, Shigeki Kawai, Ruben Perez

    ACS Nano 18 ( 39 ) 26759 - 26769 2024.10

    Research paper (scientific journal), Joint Work, Accepted

    　View Summary

    Understanding how carbon dioxide (CO2) behaves and interacts with surfaces is paramount for the development of sensors and materials to attempt CO2 mitigation and catalysis. Here, we combine simultaneous atomic force microscopy (AFM) and scanning tunneling microscopy (STM) using CO-functionalized probes with density functional theory (DFT)-based simulations to gain fundamental insight into the behavior of physisorbed CO2 molecules on a gold(111) surface that also contains one-dimensional metal–organic chains formed by 1,4-phenylene diisocyanide (PDI) bridged by gold (Au) adatoms. We resolve the structure of self-assembled CO2 islands, both confined between the PDI–Au chains as well as free-standing on the surface and reveal a chiral arrangement of CO2 molecules in a windmill-like structure that encloses a standing-up CO2 molecule and other foreign species existing at the surface. We identify these species by the comparison of height-dependent AFM and STM imaging with DFT-calculated images and clarify the origin of the kagome tiling exhibited by this surface system. Our results show the complementarity of AFM and STM using functionalized probes and their potential, when combined with DFT, to explore greenhouse gas molecules at surface-supported model systems.

  • 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, Corresponding 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.

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

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Reviews, Commentaries, etc. 【 Display / hide 】

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Presentations 【 Display / hide 】

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

  • 磁鉄鉱の室温における水性ガスシフト反応に対する触媒作用の検証と機構解明

    2025.04
    -
    Present

    独立行政法人日本学術振興会, 科学研究費　基盤研究(B), Research grant, Principal investigator

  • 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
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    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
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    2025.03

    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
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    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
    -
    2023.03

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

  • SOLID STATE SCIENCE

    2025

  • SOLID STATE PHYSICS 1

    2025

  • PRESENTATION TECHNIQUE

    2025

  • LABORATORY IN SCIENCE

    2025

  • INDEPENDENT STUDY ON FUNDAMENTAL SCIENCE AND TECHNOLOGY

    2025

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Memberships in Academic Societies 【 Display / hide 】

  • American Chemical Society, 

    2023.05
    -
    2024.05

  • 次世代ナノプローブ技術委員会委員, 

    2023.04
    -
    Present

  • The Japan Society of Applied Physics, 

    2021.01
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    Present

  • 日本表面真空学会, 

    2018.04
    -
    Present

  • 日本化学会, 

    2014
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2025.05
    -
    Present

    関東支部幹事役員, 公益社団法人　日本表面真空学会

  • 2024.05
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    Present

    協議員, 公益社団法人　日本表面真空学会

  • 2023.12
    -
    2024.10

    プログラム委員, The 15th International Symposium on Atomic Level Characterizations for New Materials and Devices (ALC’22)

  • 2023.05
    -
    2025.05

    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

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