2012S2-006
エネルギー変換材料の表面界面物性：VUV/SX放射光分光による研究

Last modified 2020-10-08 by s-proposalpfiqst.kek.jp

●基本情報
　●実験責任者：吉信　淳（東大物性研）
　●課題有効期間：2012/10〜2015/9
　●実験ステーション：13A
　●関連課題：2009S2-007（有機分子−電極系の構造・電子状態と電荷移動ダイナミクス）
　　　　　　　2006S2-002（コインシデンス分光による内殻励起、オージェ緩和、イオン脱離の研究）

●課題の概要
　本申請では，数10eVから約1000eVまでのVUV/SX領域をカバーするBL13Aアンジュレーター光を励起光とした角度分解光電子分光（ARPES），高分解能X線光電子分光（HR-XPS），軟X線吸収分光（XAS）およびオージェ電子－光電子コインシデンス分光法などを用いて，エネルギー変換材料の表面・界面の物性（化学状態や電子状態）を明らかにすることを目的とする．
　近年，低炭素社会への取り組み，自然エネルギー利用の拡大，エネルギーのより効率的な利用などの観点から，高性能触媒，エネルギー効率の良い発光素子やデバイス，有機材料をベースとした太陽電池，可視光応答光触媒による太陽光と水からの水素発生および水素吸蔵材料などが，研究対象として極めて重要視されている．さらに，これらのエネルギー変換材料において物質変換や光電変換，電荷移動などが起こる場所は，材料の表面や複合化された材料の界面である．よって，新しい材料の表面や界面の物性つまり化学状態や電子状態を解明することは，高性能・高機能の材料を開発するために不可欠である．
　具体的には，以下のような材料系の表面界面物性を明らかにするために，高輝度放射光を励起源とするARPES,HR-XPS，XAS，コインシデンス分光を行う．
・光触媒となる酸化物・酸化物薄膜
・有機太陽電池（積層有機薄膜）および有機半導体-電極接合系
・炭化水素の水素化・脱水素化や二酸化炭素活性化のための遷移金属触媒
・排ガス処理触媒
・水素吸蔵材料
・グラフェン，シリセン，トポロジカル絶縁体などの新奇な低次元ナノ電子材料
　また，BL13Aは近い将来に２ブランチ化およびアンジュレーターの更新が予定されており，この機会を活かして，準大気圧光電子分光装置（慶応大学・近藤研究室保有）を準常設ステーションとしてどちらかのブランチに設置したい．表面化学ユーザーグループと表面ARPESユーザーグループの中心的なメンバーから構成される本S2チームは，積極的にPFスタッフと協力して，ビームライン・実験ステーションの立ち上げと最適化を行うことも重要なミッションであると考えている．

●成果発表
　●論文

• "Formation of BN-covered silicene on ZrB₂/Si(111) by adsorption of NO and thermal processes"
  Jun Yoshinobu1,a), Kozo Mukai, Hiroaki Ueda, Shinya Yoshimoto, Sumera Shimizu, Takanori Koitaya, Hiroyuki Noritake, Chi-Cheng Lee, Taisuke Ozaki, Antoine Fleurence, Rainer Friedlein, and Yukiko Yamada-Takamura
  J. Chem. Phys., 153 (2020) 064702.
• "The roles of step-site and zinc in surface chemistry of formic acid on clean and Zn-modified Cu(111) and Cu(997) surfaces studied by HR-XPS, TPD, and IRAS"
  Yuichiro Shiozawa, Takanori Koitaya, Kozo Mukai, Shinya Yoshimoto, and Jun Yoshinobu
  J. Chem. Phys., 152 (2020) 044703.
• "A Surface Science Approach to Unveiling the TiO₂ Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime"
  Kenichi Ozawa, Susumu Yamamoto, Kazuhiko Mase, Iwao Matsuda
  e-J. Surf. Sci. Nanotechnol., 17 (2019) 130.
• "Correlation between Photocatalytic Activity and Carrier Lifetime: Acetic Acid on Single-Crystal Surfaces of Anatase and Rutile TiO₂"
  Kenichi Ozawa, Susumu Yamamoto, Ryu Yukawa, Ro-Ya Liu, Naoya Terashima, Yuto Natsui, Hiroo Kato, Kazuhiko Mase, and Iwao Matsuda
  J. Phys. Chem. C, 122 (2018) 9562.
• "Systematic Study of Adsorption and the Reaction of Methanol on Three Model Catalysts: Cu(111), Zn–Cu(111), and Oxidized Zn–Cu(111)"
  Takanori Koitaya, Yuichiro Shiozawa, Yuki Yoshikura, Kozo Mukai, Shinya Yoshimoto, and Jun Yoshinobu
  J. Phys. Chem. C, 121 (2017) 25402.
• "Femtosecond to picosecond transient effects in WSe₂ observed by pump-probe angle-resolved photoemission spectroscopy"
  Ro-Ya Liu, Yu Ogawa, Peng Chen, Kenichi Ozawa, Takeshi Suzuki, Masaru Okada, Takashi Someya, Yukiaki Ishida, Kozo Okazaki, Shik Shin, Tai-Chang Chiang and Iwao Matsuda
  Sci. Rep., 7 (2017) 15981.
• "Growth of ultrathin titanium oxide films on Ag(110)"
  Yuichi Sugizaki, Kenichi Ozawa and Kazuyuki Edamoto
  Jpn. J. Appl. Phys., 56 (2017) 085501.
• "Electronic states and growth modes of Zn atoms deposited on Cu(111) studied by XPS, UPS and DFT"
  Takanori Koitaya, Yuichiro Shiozawa, Yuki Yoshikura, Kozo Mukai, Shinya Yoshimoto, Siro Torii, Fahdzi Muttaqien, Yuji Hamamoto, Kouji Inagaki, Yoshitada Morikawa, Jun Yoshinobu
  Surf. Sci., 663 (2017) 1.
• "Electronic structure of Fe₂P(101¯0) studied by soft X-ray photoelectron spectroscopy and X-ray absorption spectroscopy"
  Y. Sugizaki, H. Motoyama, K. Edamoto, K. Ozawa
  Surf. Sci., 664 (2017) 50.
• "What Determines the Lifetime of Photoexcited Carriers on TiO₂ Surfaces?"
  Kenichi Ozawa, Susumu Yamamoto, Ryu Yukawa, Roya Liu, Masato Emori, Koki Inoue, Taku Higuchi, Hiroshi Sakama, Kazuhiko Mase, and Iwao Matsuda
  J. Phys. Chem. C, 120 (2016) 29283.
• "In situ analysis of catalytically active Pd surfaces for CO oxidation with near ambient pressure XPS"
  Hiroshi Kondoh, Ryo Toyoshima, Yuji Monya, Masaaki Yoshida, Kazuhiko Mase, Kenta Amemiya, Bongjin Simon Mun
  Catalysis Today, 260 (2016) 14.
• "Electronic states and electrical conductivity of the Si(111) native oxide surface adsorbed with electron donor tetrakis(dimethylamino)ethylene"
  Shinya Yoshimoto, Yuichiro Shiozawa, Takanori Koitaya, Hiroyuki Noritake, Kozo Mukai and Jun Yoshinobu
  J. Appl. Phys., 120 (2016) 085310.
• "Growth of ultrathin vanadium oxide films on Ag(100)"
  Takuya Nakamura, Yuichi Sugizaki, Shuhei Ishida, Kazuyuki Edamoto and Kenichi Ozawa
  Jpn. J. Appl. Phys., 55 (2016) 075501.
• "Electron-Donor Dye Molecule on ZnO(101¯0), (0001), and (0001¯) Studied by Photoelectron Spectroscopy and X-ray Absorption Spectroscopy"
  Kenichi Ozawa, Masahiro Suzuki, Ryo Tochikubo, Hiroo Kato, Yuichi Sugizaki, Kazuyuki Edamoto, and Kazuhiko Mase
  J. Phys. Chem. C, 120 (2016) 8653.
• "Observation of Fano line shapes in infrared vibrational spectra of CO₂ adsorbed on Cu(997) and Cu(111)"
  Takanori Koitaya, Yuichiro Shiozawa, Kozo Mukai, Shinya Yoshimoto and Jun Yoshinobu
  J. Chem. Phys. 144 (2016) 054703.
• "Adsorption and Reaction of CO and NO on Ir(111) Under Near Ambient Pressure Conditions"
  K. Ueda,K. Suzuki, R. Toyoshima, Y. Monya, M. Yoshida, K. Isegawa, K. Amemiya, K. Mase, B. S. Mun, M. A. Arman, E. Grånäs, J. Knudsen, J. Schnadt, H. Kondoh
  Topics in Catalysis 59 (2016) 487.
• "CO Adsorption on Pd–Au Alloy Surface: Reversible Adsorption Site Switching Induced by High-Pressure CO"
  Ryo Toyoshima, Nana Hiramatsu, Masaaki Yoshida, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun, and Hiroshi Kondoh
  J. Phys. Chem. C 120 (2016) 416.
• "In-situ analysis of catalytically active Pd surfaces for CO oxidation with near ambient pressure XPS"
  Hiroshi Kondoh, Ryo Toyoshima, Yuji Monya, Masaaki Yoshida, Kazuhiko Mase, Kenta Amemiya, Bongjin Simon Mun
  Catalysis Today 260 (2016) 14.
• "In-situ Observations of Catalytic Surface Reactions with Soft X-rays under Working Conditions"
  Ryo Toyoshima and Hiroshi Kondoh
  J. Phys.: Condens. Matter 27 (2015) 083003.
• "High-Pressure NO Induced Mixed Phase on Rh(111): Chemically-Driven Replacement"
  Ryo Toyoshima, Masaaki Yoshida, Yuji Monya, Kazuma Suzuki, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun, and Hiroshi Kondoh
  J. Phys. Chem. C 119 (2015) 3033.
• "A high-pressure-induced dense CO overlayer on a Pt(111) surface: a chemical analysis using in situ near ambient pressure XPS"
  Ryo Toyoshima, Masaaki Yoshida, Yuji Monya, Kazuma Suzuki, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun and Hiroshi Kondoh
  Phys. Chem. Chem. Phys. 16 (2014) 23564.
• "Monolayer selective methylation of epitaxial graphene on SiC(0001) through two-step chlorination-alkylation reactions"
  Md. Zakir Hossain, Maisarah B. A. Razak, Hiroyuki Noritake, Yuichiro Shiozawa, Shinya Yoshimoto, Kozo Mukai, Takanori Koitaya, Jun Yoshinobu and Sumio Hosaka
  J. Phys. Chem. C 118 (2014) 22096.
• "In Situ Observation of Model Catalysts under Reaction Conditions Using X-ray Core-Level Spectroscopy"
  Masaaki Yoshida and Hiroshi Kondoh
  The Chemistry Record 14 (2014) 806.
• "Novel cathode buffer layer of Ag-doped bathocuproine for small molecule organic solar cell with inverted structure"
  Xia Hao, Shenghao Wang, Wei Fu, Takeaki Sakurai, Shigeru Masuda, Katsuhiro Akimoto
  Organic Electronics 15 (2014) 1773.
• "Regular ripples at the surfaces of heteroepitaxially grown Ag(111) ultra-thin films on Si(111)3×3-B substrates"
  Yusaku Yoshiike, Hiroyuki Fukumoto, Ikuya Kokubo, Yuki Aoki, Kan Nakatsuji, and Hiroyuki Hirayama
  Appl. Phys. Lett. 104 (2014) 191605.
• "Aqueous-Phase Oxidation of Epitaxial Graphene on the Silicon Face of SiC(0001)"
  Md. Zakir Hossain, Maisarah B. A. Razak, Shinya Yoshimoto, Kozo Mukai, Takanori Koitaya, Jun Yoshinobu, Hayato Sone, Sumio Hosaka, and Mark C. Hersam
  J. Phys. Chem. 118 (2014) 1014.
• "A near-ambient-pressure XPS study on catalytic CO oxidation reaction over a Ru(101¯0) surface"
  Ryo Toyoshima, Masahiro Shimura, Masaaki Yoshida, Yuji Monya, Kazuma Suzuki, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun, Hiroshi Kondoh
  Surf. Sci. 621 (2014) 128.
• "Favorable electronic structure for organic solar cells induced by strong interaction at interface"
  Shenghao Wang, Takeaki Sakurai, Xia Hao, Wei Fu, Shigeru Masuda, and Katsuhiro Akimoto
  J. Appl. Phys. 114 (2013) 183707.
• "In-Situ Photoemission Observation of Catalytic CO Oxidation Reaction on Pd(110) under Near-Ambient-Pressure Conditions: Evidence for the Langmuir-Hinshelwood Mechanism"
  Ryo Toyoshima, Masaaki Yoshida, Yuji Monya, Kazuma Suzuki, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun and Hiroshi Kondoh
  J. Phys. Chem. 117 (2013) 20610.