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Photoelectrochemical Designing of Nano-Porous Structures on TiO_2 Electrode and its Application to Gas Sensor

Research Project

Project/Area Number 14550787
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 工業物理化学
Research InstitutionGifu University

Principal Investigator

SUGIURA Takashi  GIFU UNIVERSITY, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40171144)

Co-Investigator(Kenkyū-buntansha) MIMOURA Hideki  GIFU UNIVERSITY, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (40021612)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordsphotoelectrochemical / photoething / nano porous structure / gas sensor / surface treatment / titanium dioxide
Research Abstract

TiO_2 is a very attractive material for photocatalysts, dye-sensitized solar cells and gas sensors by its favorable chemical, physical, optical and electrical properties. In the previous study, we have found that the photoelectrochemical etching(photoetching) of TiO_2 electrode creates unique nano-porous surfaces (named nano-honeycomb structure), depending upon the crystallographic orientation of each grain.
This work reports photoelectrochemical designing of TiO_2 electrode and its application to the gas sensor. One of the interesting features in thus obtained surface morphology is a selective exposure of the specific crystallographic faces, i.e., (100) surfaces of rutile, when photoetching is carried out under certain conditions. The large specific surface area and high crystallinity of photoetched TiO_2 surface makes it an attractive material for sensor device. The photoetching pattern has been changed by controlling the properties of TiO_2 (carrier density, grain size, etc.) and photoetching condition. When the photoetching quantity increase to 1,000 C/cm^2 thin and long rod-like surface structure (named nano-rod structure) is create on TiO_2 surface. The gas sensor response properties were tested by monitoring electric resistance changes for the detection of hydrogen gas. The photoetching of TiO_2 improve its gas sensor characteristics in terms of the reverse response time and sensitivity. The enlargement of the specific surface area in the grain bulk seems to be responsible to the higher sensitivity. The photoetching increases the resistance in air due to the adsorption of O_2 at a higher amount, which, however, can be efficiently desorbed to reduce resistance to the same level to that of the untreated material. As the photoetching not just increases the surface area but leads to a relative increase of the (100) faces which allow fast adsorption of O_2, the reverse response time has been shortened, due to their increased share in the gas sensing process

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Han.Jin.Ryu, et al.: "Effect of Photoelectrochemical Etching on Titanium Dioxide Gas Sensors"Trans.Mater.Res.Soc.Jpn.. 27. 695-698 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 杉浦 隆, 他: "光電気化学エッチングによる酸化チタンナノロッド構造の創製"色材協会誌. 77. 64-68 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takashi Sugiura, et al.: "Photoelectrochemical Designing of Nano-Porous Structures on TiO_2 Film Electrode"Trans.Mater.Res.Soc.Jpn.. (in press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Han.Jin.Ryu, et al.: "Effect of Photoelectrochemical Etching on Titanium Dioxide Gas Sensors"Thans.Mater.Res.Soc.Jpn. 27. 695-698 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takashi Sugiura, et al.: "Preparation of Nanorod Structure of TiO_2 by the Use of Photoelectrochemical Etching Technique"J.Jpn.Soc.of Color Mater (in Japanese). 77. 64-68 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takashi Sugiura, et al.: "Photoelectrochemical Designing of Nano-Porous Structures on TiO2 Film Electrode"Thans.Mater.Res.Soc.Jpn. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Han.Jin.Ryu: "Effect of Photoelectrochemical Etching on Titanium Dioxide Gas Sensors"Trans.Mater.Res.Soc.Jpn.. 27・4. 695-698 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] 杉浦 隆: "光電気化学エッチングによる酸化チタンナノロッド構造の創製"色材協会誌. 77・2. 64-68 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takashi Sugiura: "Photoelectrochemical Designing of Nano-Porous Structures on TiO_2 Film Electrode"Trans.Mater.Res.Soc.Jpn.. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.J.Ryu, T.Sugiura他: "Effect of Photoelectrochemical Etching on Titanium Dioxide Gas Sensors"Thrans. Mater. Res. Soc. Jpn.. 27・4. 695-698 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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