KEIO RESEARCHERS INFORMATION SYSTEM

Career 【 Display / hide 】

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 】

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

Academic Degrees 【 Display / hide 】

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

Research Areas 【 Display / hide 】

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

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Atomic Force Microscopy

• Functional organic thin films

• Surface Science

• Scanning Tunneling Microscopy

• Scanning Probe Microscopy

Books 【 Display / hide 】

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

Papers 【 Display / hide 】

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.

  • Access to Document (DOI)

• 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.

  • Access to Document (DOI)

• 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.

  • Access to Document (DOI)

• 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.

  • Access to Document (DOI)

• Effect of Molecule-Substrate Interactions on the Adsorption of meso-Dibenzoporphycene Tautomers Studied by Scanning Probe Microscopy and First-Principles Calculations

  Tomoko K. Shimizu, Carlos Romero-Muniz, Oleksander Stetsovych, Jaime Carracedo-Cosme, Michael Ellner, Pablo Pou, Koji Oohora, Takashi Hayashi, Ruben Perez, Oscar Custance

  Journal of Physical Chemistry C 124 （ 49 ） 26759 - 26768 2020.12

  Research paper (scientific journal), Joint Work, Lead author, Accepted,  ISSN  19327447

  　View Summary

  meso-Dibenzoporphycene molecules adsorbed on the Ag(111) surface and on 2-monolayer-thick NaCl films were studied using submolecular resolution atomic force microscopy (AFM), scanning tunneling microscopy (STM), and first-principles calculations to clarify their stability and tautomerization behavior. We have found that the bonding of the molecules with the surface is determined by the interplay of different contributions, including the interaction of the π-aromatic orbitals of the benzene rings and the metal-coordination bond of the lone-pair electrons of the imine nitrogen atoms with the metal atoms (Ag, Na) on each substrate. The strength of the latter ultimately governs the molecular adsorption configuration and determines the nature and energy barriers for tautomerization. On Ag(111), the interaction of the imine nitrogen atoms with the Ag atoms deforms the macrocycle of porphycene, leading to a distinct AFM contrast that allows a clear identification of the molecule in its cis tautomeric form. In contrast, on NaCl films, the weaker interaction with the Na atoms leads to a flatter geometry and very similar adsorption configurations for the cis- and trans-forms, which cannot be distinguished in AFM experiments. Although weak, the dominant role of this local N-Na interaction, compared to the essentially nondirectional dispersive interactions, results in a new type of tautomerization process. In this case, the transfer of hydrogen atoms within the porphycene cavity is accompanied by a significant displacement of the whole molecule to a new site to reach a new minimum energy adsorption configuration. Our theoretical calculations indicate that this lateral translation, rather than the intramolecular H transfer, dominates the activation energy on NaCl. This novel tautomerization behavior, which we have identified on a rather inert ionic surface, might also be present on other weakly interacting substrates.

  • Access to Document (DOI)

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

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

• Atomic scale investigation of magnetite surfaces towards understanding of its catalytic properties

  Shimizu, Tomoko K.

  学事振興資金研究成果実績報告書 （慶應義塾大学)  2019

• Atomic scale investigation of magnetite surfaces towards understanding of its catalytic properties

  Shimizu, Tomoko K.

  学事振興資金研究成果実績報告書 （慶應義塾大学)  2018

Reviews, Commentaries, etc. 【 Display / hide 】

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

  • Access to Document (DOI)

• 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

Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• 常温大気圧下でのカーボンナノチューブのナノメートルラマンイメージングと新規選択則

  藤田優人,早澤紀彦,Balois-Oguchi Maria Vanessa,田中拓男,清水智子

  日本表面真空学会2024年度関東支部講演大会, 

  2024.04

  , 

  Poster presentation

• 2 種のカーボンブラック試料のナノスケール構造と化学特性の比較評価

  有吉悠人,砂子田茉莉,藤田優人,青木崇行,清水智子

  日本表面真空学会2024年度関東支部講演大会, 

  2024.04

  , 

  Poster presentation

• 赤外散乱走査型近接場光学顕微鏡を用いた金属有機構造体薄膜の結晶性評価

  松本征大, 清水智子

  日本表面真空学会2024年度関東支部講演大会, 

  2024.04

  , 

  Poster presentation

• 近接場光によるカーボンナノチューブ内の偏光共鳴ラマンの選択則変化

  藤田 優人, 早澤 紀彦 , Balois-Oguchi Maria Vanessa , 田中 拓男 , 清水 智子

  第71回応用物理学会春季学術講演会, 

  2024.03

  , 

  Oral presentation (general)

• Scanning Tunneling Microscopy Studies of Diarylethene Monolayer and Cluster Formation on Noble Metal Surfaces

  T. Kaneko, K. Sagisaka, Tomoko K. Shimizu

  AVS 69 International Symposium & Exhibition, 

  2023.11

  , 

  Poster presentation

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

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

  -

  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 】

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

Courses Taught 【 Display / hide 】

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 】

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 】

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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