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Interaction between photocatalyst surface nanostructures and ultraviolet light by apertureless scanning nearfield optical microscopy

Research Project

Project/Area Number 15360433
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Catalyst/Resource chemical process
Research InstitutionUniversity of Yamanashi

Principal Investigator

KOMIYAMA Masaharu  University of Yamanashi, Department of Research Interdisciplinary Graduate School of Medicine and Engineering, Professor, 大学院・医学工学総合研究部, 教授 (60150257)

Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥3,900,000 (Direct Cost: ¥3,900,000)
Keywordsscanning tunneling microscopy / nearfield optical microscopy / photocatalyst / Cu chalcogenide / multi-quantum well / synchrotron radiation / Fullerene / titanium dioxide / アパチャレス / 特性X線
Research Abstract

Ultraviolet (UV) irradiation on titanium dioxide surface gives apparent structural changes as observed by scanning tunneling microscopy (STM), which are the consequence of electronic excitation of the surface by UV light. Here local photoresponse of a rutile TiO_2(110) surface is visualized at atomic scale by STM. Almost all the areas on the (110) surface responded to the illumination of 325-nm ultra-violet (UV) light, in accordance with the minimum band-gap (3.2eV) electron transition, with steps and (1×2) ridge areas exhibiting higher response intensities. When the same surface is illuminated with blue light at 442nm, which is well below the minimum band-gap transition energy, most of the surface areas were dormant, but certain areas at step regions and (1×2) ridge structures responded to the blue light. These sites are associated with oxygen deficiency on the surface, which may give a clue to the possibility of surface engineering of titania photocatalyst to be employed under visible light.
We also conducted a comprehensive Kelvin probe force microscopy (KPFM) study on the "classical" organic solar cell system consisting of MDMO-PPV:PCBM blends. The KPFM method yields detailed information of topography and local work function at nanometer scale. Experiments were performed either in dark or under laser illumination at 442nm or 675nm to extract the locally resolved surface photovoltage (SPV). We identified distinct differences in the energetics on the surface of chlorobenzene and toluene cast blend films. Together with high resolution scanning electron microscopy (SEM) experiments we were able to interpret the KPFM results and to draw some conclusions for the electron transport towards the cathode in the solar cell configuration. The results suggest a blocking behavior of the toluene cast film surfaces against electron propagation towards the cathode, usually evaporated on top of the films in organic solar cells.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (14 results)

All 2005 2004 2003 Other

All Journal Article (11 results) Book (1 results) Publications (2 results)

  • [Journal Article] Photoresponse of Surface Oxygen Defects on TiO_2(110)2005

    • Author(s)
      M.Komiyama
    • Journal Title

      Applied Surface Science 244

      Pages: 550-553

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Kelvin Probe Force Microscopy Study on Conjugated Polymer/Fullerene Organic Solar Cells2005

    • Author(s)
      Th.Glatzel
    • Journal Title

      Japanese Journal of Applied Physics 44

      Pages: 5370-5373

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Kelvin Probe Force Microscopy Study on Conjugated Polymer/ Fullerene Organic Solar Cells2005

    • Author(s)
      Th.Glatzel
    • Journal Title

      Japanese Journal of Applied Physics 44

      Pages: 5370-5373

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Cobalt CVD process on a molybdenite basal plane observed by ultra-high vacuum scanning tunneling microscopy2005

    • Author(s)
      M.Komiyama
    • Journal Title

      Japanese Journal of Applied Physics 44

      Pages: 5455-5458

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photoresponse of Titanium Dioxide Surface at Atomic Scale : Site for Visible Light Absorption2004

    • Author(s)
      M.Komiyama
    • Journal Title

      Japanese Journal of Applied Physics 43

      Pages: 4584-4587

    • NAID

      10013431517

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Local Structural Change caused by Light Irradiation on TiO_2(110) Surface observed by Scanning Tunneling Microscopy2004

    • Author(s)
      Y.-J.Li
    • Journal Title

      Applied Surface Science 237

      Pages: 374-379

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] STMによるTiO_2表面の光励起状態の観察2004

    • Author(s)
      小宮山政晴
    • Journal Title

      触媒 46

      Pages: 570-575

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Crater Structures on a Molybdenite Basal Plane observed by Ultra-high Vacuum Scanning Tunneling Microscopy and its Implication to Hydrotreating2004

    • Author(s)
      M.Komiyama
    • Journal Title

      Journal of Molecular Catalysis A 215

      Pages: 143-147

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Defect Creation on TiO_2(110)-(1×1) Surface due to Light Irradiation Observed by Scanning Tunneling Microscopy2004

    • Author(s)
      Y.-J.Li
    • Journal Title

      Applied Surface Science 237

      Pages: 374-379

    • Related Report
      2004 Annual Research Report
  • [Journal Article] In Situ Observations of Tetraamineplatinum(II) Hydroxido Adsorption from Its Aqueous Solution on Heulandite(010) Surface by Atomic Force Microscopy2004

    • Author(s)
      M.Komiyama
    • Journal Title

      Applied Surface Science 237

      Pages: 503-508

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Electronic Structure Change on TiO_2 Surface due to UV Light Irradiation2003

    • Author(s)
      M.Komiyama
    • Journal Title

      Studies of Surface Science and Catalysis 145

      Pages: 153-156

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] 表面・界面工学大系2005

    • Author(s)
      小宮山政晴(本田健一監修)(分担執筆)
    • Total Pages
      1393
    • Publisher
      テクノシステム
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] M.Komiyama, D.Yin, Y.-J.Li: "Electronic Structure Change on TiO_2 Surface due to UV Light Irradiation"Studies of Surface Science and Catalysis. 145. 153-156 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 小宮山政晴: "STM/AFMによる触媒表面解析"ペトロテック. 26. 478-483 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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