辻川 夕貴 ( ツジカワ ユキ )

Tsujikawa, Yuki

写真a

所属(所属キャンパス)

理工学部 化学科 表面化学研究室 ( 矢上 )

職名

助教(有期)

経歴 【 表示 / 非表示 】

  • 2021年04月
    -
    2024年03月

    日本学術振興会, 特別研究員(DC1)

  • 2024年04月
    -
    2024年08月

    東京大学物性研究所, 極限コヒーレント光研究所松田巌研究室, 特任助教

  • 2024年09月
    -
    継続中

    慶応義塾大学, 理工学部化学科, 助教(有期)

学歴 【 表示 / 非表示 】

  • 2015年04月
    -
    2019年03月

    早稲田大学, 先進理工学部, 応用物理学科

    大学, 卒業

  • 2019年04月
    -
    2021年03月

    早稲田大学, 先進理工学研究科, 物理学及応用物理学専攻

    大学院, 修了, 修士

  • 2021年04月
    -
    2024年03月

    東京大学, 理学系研究科, 物理学専攻

    大学院, 修了, 博士

学位 【 表示 / 非表示 】

  • 博士(理学), 東京大学, 課程, 2024年03月

 

論文 【 表示 / 非表示 】

  • Existence of the Coadsorbed Phase of the CO Intermediates under CO2 Activation with Hydrogen on Ru(0001)

    Yu Murano, Masafumi Horio, Yifu Liu, Haruto Sakurai, Yuki Tsujikawa, Yoko Saito, Takeru Nakashima, Yasunobu Ando, Hiroshi Kondoh, Kenichi Ozawa, and Iwao Matsuda

    The Journal of Physical Chemistry C, 130 ( 29 ) 1026 - 10268 2026年07月

    研究論文(学術雑誌), 共著, 査読有り

     概要を見る

    The mechanism for CO2 activation on the Ru(0001) surface, the dominant surface of catalytic Ru nanoparticles, was elucidated using operando ambient-pressure X-ray photoelectron spectroscopy in CO2/H2. At 300 K, the major reaction was CO2 dissociation, generating CO adsorbates at both atop and bridge sites (COt* and COb*, respectively). The appearance of such a coadsorbed phase of COt* and COb* was reproduced by density functional theory calculations. At 370–470 K, these CO* species were converted to elemental carbon. Because the reaction condition matched the temperature ranges of the CO2 methanation on the Ru-based catalysts, COt* and COb* coadsorbed specifically at the interface between Ru(0001) and CO2/H2 gases seem to be the critical factor for elucidating the reaction mechanism.

  • Role of Quasi-One-Dimensional B Chains in the Catalytic Properties of CuB/Cu(111)

    Nakashima T., Tsujikawa Y., Kondo T., Koitaya T., Matsuda I., Ando Y.

    Journal of Physical Chemistry C 130 ( 15 ) 5411 - 5417 2026年04月

    ISSN  19327447

     概要を見る

    The electron deficiency of boron leads to rich polymorphism and a high degree of freedom in material design. This research focuses on the newly reported CuB/Cu(111) surface and elucidates its catalytic properties. To assess its catalytic activity, this research investigates elementary steps relevant to CO<inf>2</inf> hydrogenation─specifically hydrogen, oxygen, and formate adsorption on this surface─by using a combination of first-principles calculations (OpenMX) and machine learning potentials (Matlantis). Our calculations verify five key points: (i) charge transfer occurs from copper atoms to boron chains, (ii) hydrogen atoms are observed to be adsorbed along the boron chain, (iii) hydrogen hopping between boron-tops shows three-center two-electron bonding in the transition state, (iv) surface oxidation can disrupt the boron chains, and (v) boron chains promote the adsorption of formate. In conclusion, the unique boron chains in CuB/Cu(111) can play a key role in the catalytic reactivity of this surface.

  • Adhesion between a borophane sheet and a metal substrate by interface bonding

    Yamaguchi K., Yin H., Niibe M., Tang J., Miyamoto M., Tsujikawa Y., Sakurai H., Murano Y., Ozawa K., Horio M., Yamaura J.i., Kondo T., Matsuda I.

    Applied Surface Science Advances 31 2026年01月

     概要を見る

    Boron deposited on transition metal substrates has been actively investigated as a system that exhibits a wide range of surface structures. However, the specific case of nickel substrates remains largely unexplored. Nickel boride is used as a tribological material with excellent wear resistance and as a catalyst for hydrogenation, and its synthesis methods, structure, and functionality are being vigorously investigated. In this study, borophane, a two-dimensional material composed of hydrogen and boron, was heated to 300 °C in contact with a nickel substrate. We found that, compared with that annealed at 100 °C, annealed at 300 °C had a color that shifted toward longer wavelengths, and no longer dissolved in the synthesis solvent. However, x-ray diffraction and Fourier-transform infrared spectroscopy revealed no significant differences between the borophane samples annealed at 100 and 300 °C. X-ray absorption spectroscopy and x-ray photoelectron spectroscopy revealed that the surface oxide of nickel was reduced by borophane, resulting in the formation of nickel boride. Furthermore, thermal desorption spectroscopy showed that hydrogen desorbed from borophane upon contact with nickel, revealing that the borophane–nickel interface consisted of nickel boride and boron oxide layers. These findings provide insight into the surface science of boron on transition metal substrates and for the development of functional materials using these systems.

  • Discovery of bicyclic borane molecule B14H26

    Zhang X., Fujino T., Ando Y., Tsujikawa Y., Wang T., Nakashima T., Sakurai H., Yamaguchi K., Horio M., Mori H., Yoshinobu J., Kondo T., Matsuda I.

    Communications Chemistry 8 ( 1 )  2025年12月

     概要を見る

    The discovery of fullerene following the synthesis of graphene marked a paradigm shift in chemistry. Here, we report the discovery of biycycloborane, arising from the synthesis of borophane (hydrogen boride). Uniquely, this synthesis method involves a decomposition mechanism rather than traditional atom-by-atom assembly, marking an unique approach to constructing complex borane structures. The mass spectrometry unveiled that the stable molecule has a mass of 178 in atomic mass unit with a stoichiometry of B<inf>14</inf>H<inf>26</inf>. Optical spectra and simulations further evidenced its bicyclic structure, featuring fulvene-like heptagons or octagons. This borane molecule, analogous to cyclic hydrocarbons, adopts a unit configuration with a three-center two-electron (3c-2e) bonding, akin to diborane. The B<inf>14</inf>H<inf>26</inf> molecule has been historically anticipated as a distant descendant of the dodecahedron borane, but it was born from the hydrogen boride sheet with a non-symmorphic symmetry. The discovery of biycycloborane expands the frontiers of boron chemistry, promising advancements in boron-based nanomaterials and beyond.

  • Electronic structure of the YCrB4 crystal surface, studied by micro-focused photoemission spectroscopy

    Zhang X., Tsujikawa Y., Miyamoto M., Yamaguchi K., Niibe M., Nishio-Hamane D., Yuan M., Ozawa K., Horio M., Yubuta K., Kondo T., Matsuda I.

    Physical Review Materials 9 ( 9 )  2025年09月

     概要を見る

    We have performed a comprehensive electronic characterization of the needle-like single crystal YCrB4 metal boride, prepared by cleavage, characterized using angle-resolved photoemission spectroscopy with a microfocused beam. Our findings reveal the three-dimensional (3D) band structure of YCrB4, with band dispersions closely aligning with the first-principles calculations, confirming it is a topologically trivial insulator with a narrow band gap. Furthermore, a new metallic surface band was observed after cleavage, likely due to a space charge layer of the electron accumulation type. This study highlights the pivotal role of surface phenomena in shaping the electronic structure of YCrB4 and provides insights into the interplay between bulk and surface states, offering a path for exploring its potential applications in surface-sensitive technologies.

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総説・解説等 【 表示 / 非表示 】

  • 表面金属放火物における周期及び準周期原子鎖構造の形成

    辻川夕貴, 松田巌

    日本放射光学会誌「放射光」 38 ( 2 ) 85 - 99 2025年03月

    記事・総説・解説・論説等(学術雑誌), 共著, 筆頭著者

  • 全反射高速陽電子回折法による表面ホウ化銅の構造研究と新規ホウ素鎖の構造解明

    辻川夕貴,望月出海,和田健,兵頭俊夫,松田巌

    Photon Factory News 41 ( 2 ) 21 - 25 2023年08月

    記事・総説・解説・論説等(大学・研究所紀要), 筆頭著者

  • Structure of the Boron Atomic Wire on Cu(111) and its Unique Relationships to the Carbon Chain Molecules

    Y. Tsujikawa and I. Matsuda

    Photon Factory Highlights 2022   8 - 9 2023年01月

    記事・総説・解説・論説等(大学・研究所紀要), 共著, 筆頭著者

研究発表 【 表示 / 非表示 】

  • Recent Results of In Situ Surface Analysis Using APXPS at KEK, BL13 with a Focus on CO2 Reduction and Hydrogen Spillover

    Yuki Tsujikawa

    [国際会議]  Workshop on advanced X-ray photoemission spectroscopy, 

    2026年07月
    , 

    口頭発表(招待・特別)

  • Structural Identification Using Positron Diffraction and Insights into Electronic Properties of Cu Boride Surfaces

    Yuki Tsujikawa

    The 76th REIMEI Workshop: Positron Diffraction Studies on 2D Materials and Related Novel Surface Analysis Techniques, 

    2026年03月
    , 

    口頭発表(招待・特別)

  • Structure analysis of boron compound surfaces using positron beams

    Yuki Tsujikawa, Takeru Nakashima, Xiaoni Zhang, Horio Masafumi, Izumi Mochizuki, Ken Wada, Toshio Hyodo, Fumio Komori, Takahiro Kondo, Yasunobu Ando, Hiroshi Kondoh, and Iwao Matsuda

    [国際会議]  The 10th International Symposium on Surface Sciecnce, 

    2025年12月
    , 

    口頭発表(一般)

  • Formation and electronic structure of boron–metal composite atomic chains on a 2D surface (会誌賞受賞記念講演)

    Yuki Tsujikawa, Xiaoni Zhang, Masafumi Horio, Fumio Komori, Takeru Nakashima, Yasunobu Ando, Takahiro Kondo and Iwao Matsuda

    [国内会議]  Annual Meeting of the Japan Society of Vacuum and Surface Science 2025, 

    2025年10月
    , 

    口頭発表(招待・特別)

  • 新規ホウ素化合物とその特異な構造

    Yuki Tsujikawa

    [国内会議]  日本表面真空学会 第8回若手部会研究会 & 関東支部10周年記念シンポジウム, 

    2025年04月
    , 

    口頭発表(招待・特別)

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競争的研究費の研究課題 【 表示 / 非表示 】

受賞 【 表示 / 非表示 】

  • 会誌賞

    (代表)Yuki Tsujikawa (他)Xiaoni Zhang, Masafumi Horio, Fumio Komori, Takeru Nakashima, Yasunobu Ando, Takahiro Kondo, Iwao Matsuda, 2025年10月, 日本表面真空学会, Structure and Electronic State of Boron Atomic Chains on a Noble Metal (111) Surface

    受賞区分: 学会誌・学術雑誌による顕彰

  • 2023年度日本表面真空学会 女子大学院生優秀賞

    辻川夕貴, 2023年09月, 日本表面真空学会, 銅基板上二次元ホウ化銅の探索と一次元ホウ素鎖の研究

    受賞区分: 国内学会・会議・シンポジウム等の賞

  • 学生奨励賞

    辻川夕貴, 2023年03月, 量子ビームサイエンスフェスタ事務局

    受賞区分: 国内学会・会議・シンポジウム等の賞

  • 第11回 学生優秀発表賞受賞者 (領域9)

    辻川夕貴, 2022年09月, 日本物理学会

    受賞区分: 国内学会・会議・シンポジウム等の賞

  • 第7回 学生優秀発表賞受賞者 (領域9)

    辻川夕貴, 2019年05月, 日本物理学会

    受賞区分: 国内学会・会議・シンポジウム等の賞

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担当授業科目 【 表示 / 非表示 】

  • 自然科学実験

    2026年度

  • 化学実験第1

    2026年度

  • 化学実験第1

    2025年度

  • 自然科学実験

    2025年度

 

所属学協会 【 表示 / 非表示 】

  • 日本物理学会, 

    2018年
    -
    継続中
  • 日本表面真空学会, 

    2018年
    -
    継続中