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2003 Fiscal Year Final Research Report Summary

Study of Detection Mechanism for Optically Readable Hydrogen Sensor

Research Project

Project/Area Number 13305060
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionNagaoka University of Technology

Principal Investigator

TAKATA Masasuke  Nagaoka University of Technology, Professor, 工学部, 教授 (20107551)

Co-Investigator(Kenkyū-buntansha) OKAMOTO Tomoichiro  Nagaoka University of Technology, Research Associate, 工学部, 助手 (60313566)
Project Period (FY) 2001 – 2003
KeywordsHydrogen sensor / Paradium / Optical characteristics / Optical sensing / Spectroscopic ellipsometry / Durability / Sensitivity / Response / recovery
Research Abstract

To use hydrogen as a clean energy resource, it is essential to develop devices for detection of its leakage because hydrogen is explosive with wide range of concentration and low ignition energy. An optically readable hydrogen sensor is one of the most feasible candidates because of its excellent characteristics at room temperature and high safety. The sensor consists of a thin film of catalytic metal such as palladium(Pd) deposited on the glass substrate or the optical fiber end, and the change in optical properties of the film during hydrogenation is utilized for the hydrogen detection. This project was aimed at investigating the detection mechanism of the optically readable hydrogen sensor in order to improve the sensitivity, response/recovery property and the durability. The following results were obtained from the research.
(1)The patterned Pd film on the glass substrate exhibited high sensitivity and durability. The sensitivity increased gradually with increasing hydrogen absorpti … More on-desorption cycle.
(2)The Pd films on the polyethyleneterephthalate(PET) and polycarbonate(PC) substrates showed stable sensitivity compared to the film on glass substrate. The recovery time of the Pd/PET increased with increasing cycle. On the other hand, the Pd/PC sample had the stable repetition characteristic. From these results, it turned out that substrate material influenced the sensing characteristics.
(3)The Pd/Y double-layered thin films had a great advantage of high sensitivity compared with the Pd film. The recovery time was controllable by controlling the thickness of Pd film.
(4)The sensitivity of the Pd/Mg doubter-layered thin films was higher than that of Pd/Y films. From the optical measurement by spectroscopic ellipsometry, a considerable change in the dielectric function of the Pd/Mg film in hydrogen atmosphere was observed. The change suggested the decrease in the free electron density and the appearance of polarized electrons in hydrogen atmosphere.
(5)The influence of Stearic Acid(SA) buffer layer on the durability and the sensitivity of an optically readable hydrogen sensor using Pd/SA/glass was investigated. The Pd/SA films showed high durability and sensitivity even after repeated hydrogen detection. Less

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Y.Imai, J.Mercado, T.Okamoto, M.Takata: "Study on Optically Readable Hydrogen Sensor Consisting of Pd/Mg Thin Films by Spectroscopic Ellipsometry"Key Engineering Materials. 216. 101-104 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Imai, Y.Okuhara, Y.Noguchi, M.Takata: "Optically Readable Hydrogen Sensor Using Pd/Y Double-layered Thin Films"Advances in Technology of Materials and Materials Processing Journal. 6[1]. 57-62 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nakagawa, K.Tanaka, T.Okamoto, A.Kawamoto, M.Takata: "Improvement of an Optical Hydrogen Sensor Using Pd with Organic Thin Film"Journal of the Ceramic Society of Japan. 112[5]. S579-S581 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanaka, T.Okamoto, M.Takata: "Patterning of Pd Thin Film for Optical Hydrogen Sensor by R.F.Magnetron Sputtering Method"(投稿予定). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanaka, T.Okamoto, M.Takata: "Effect of Substrate on Sensing Characteristics of Optical Hydrogen Sensor Using Pd Thin Films"(投稿予定). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Imai, J.Mercado, T.Okamoto, M.Takata: "Study on Optically Readable Hydrogen Sensor Consisting of Pd/Mg Thin Films by Spectroscopic Ellipsometry"Key Engineering Materials. 216. 101-104 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Imai, Y.Okuhara, Y.Noguchi, M.Takata: "Optically Readable Hydrogen Sensor Using Pd/Y Double-layered Thin Films"Advances in Technology of Materials and Materials Processing Journal. 6[1]. 57-62 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nakagawa, K.Tanaka, T.Okamotp, A.Kawamoto, M.Takata: "Improvement of an Optical Hydrogen Sensor Using Pd with Organic Thin Film"Journal of the Ceramic Society of Japan. 112[5]. S579-S581 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Okuhara, Y.Imai, Y Noguchi, M.Takata: "Accelerative Hydrogen Desorption from Palladium Hydride for Responsive Optical Hydrogen Sensor"(in preparation for publication).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka, T.Okamoto, M.Takata: "Patterning of Pd Thin Film for Optical Hydrogen Sensor by R. F. Magnetron Sputtering Method"(in preparation for publication).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka, T.Okamoto, M.Takata: "Effect of Substrate on Sensing Characteristics of Optical Hydrogen Sensor Using Pd Thin Films"(in preparation for publication).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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