| Project/Area Number |
07555192
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
TAKATA Masasuke Nagaoka University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (20107551)
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| Co-Investigator(Kenkyū-buntansha) |
NOGUCHI Yuji Nagaoka University of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (60293255)
HAMAGAMI Jun-ichi Tokyo Metropolitan University, Faculty of Engineering, Research Associate, 工学部, 助手 (30285100)
古曵 重美 (古曳 重美) 長岡技術科学大学, 技術開発センター, 助教授 (00261248)
ヒューブレヒツ ベン.ジ 長岡技術科学大学, 工学部, 助教授 (60251849)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥19,100,000 (Direct Cost: ¥19,100,000)
Fiscal Year 1997: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1996: ¥9,700,000 (Direct Cost: ¥9,700,000)
Fiscal Year 1995: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | Hydrogen Sensor / Operation at room temperature / Optical sensor / Pd / WO_3 / Y / Supported Pt / Catalysis / Pdセンサー / Yセンサー / Pt坦持 / 二層構造薄膜 / 単離構造薄膜 / 非接触型 / 光透過率 / 光反射率 / Pbセンサー / 単層構造薄膜 / 二層薄膜構造 / 単層薄膜構造 / MoO_3センサー |
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| Research Abstract |
The objective of this research was to search materials of thin film for optical hydrogen sensor and to improve its detection characteristics at room temperature. The sensor consisting of Pd/WO_3 (double-layered thin film) showed good sensing characteristics at room temperature. The sensor consisting of Pd/MoO_3 had faster response to detection of low concentration of hydrogen than that of Pd/WO_3. Moreover, it was found that the transmittance of Pd thin film increased with its hydrogenation and the phenomenon could be applied to a new hydrogen sensor. The strong points of the sensor are simple structure and fast response to hydrogen detection. Although thicker Pd film showed a higher sensitivity, it had a lower durability. Moreover, the sensor indicated lower recovery rate than response rate. The insertion of buffer layer such as W film between Pd film and glass substrate was effective in suppression of the surface morphology change and achieved a great durability. The change in reflectance with hydrogen desorption indicated distinctive characteristics with three-stage curve, which was due to thei phase transformation of Pd hydride. The recovery rate of the sensor increased with oxygen partial pressure, which suggested that the rate-determining step for dehydrogenation was hydrogen desorption with water forming reaction on Pd hydride surface, and adsorbed oxygen assisted the hydrogen desorption process. It was discovered that a very small quantity of Pt supported on Pd surface considerably accelerated the recovery process because of high water forming rate on Pt surface. Furthermore, double-layered thin film consisting of Pd/Y was found to indicate high sensitivity even for low concentration of hydrogen and fast response to hydrogen detection.
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