Hydrogen gas-sensing properties of Pt/WO3 thin film in various measurement conditions

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• 作者：Yuki Yamaguchi (1) j8210703@ed.tus.ac.jp
  Yukari Emoto (2)
  Tohru Kineri (2)
  Masakatsu Fujimoto (3)
  Hideo Mae (3)
  Atsuo Yasumori (1)
  Keishi Nishio (1)
• 关键词：Tungsten oxide – Thin film – Hydrogen sensor – Gasochromism – Sol–gel
• 刊名：Ionics
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：18
• 期：5
• 页码：449-453
• 全文大小：276.6 KB
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• 作者单位：1. Department of Materials Science and Technology, Tokyo University of Science, Noda, Tokyo, Japan2. Department of Applied Chemistry, Tokyo University of Science, Yamaguchi, Sanyo-Onoda, Yamaguchi, Japan3. Yamaguchi Prefectural Industrial Technology Institute, Ube, Yamaguchi, Japan
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

A well-known gasochromic material is Pt particle-dispersed tungsten trioxide (Pt/WO₃). Its optical properties could make it effective as a hydrogen gas sensor. In this study, Pt nanoparticle-dispersed WO₃ thin films were prepared using the sol–gel process, and their optical and electrical properties dependent on the working environment (i.e., temperature, hydrogen gas concentration, oxygen partial pressure, etc.) were investigated. The Pt/WO₃ thin films prepared at 400 °C showed the largest change in optical transmittance and electrical conductivity when exposed to hydrogen gas compared with the films prepared at other temperatures. The optical absorbance and electrical conductivity were found to be dependent on the hydrogen and oxygen gas concentration in the atmosphere because generation and disappearance of W5+ in the thin films depend on the equilibrium reaction between injection and rejection of H+ into and from the thin films. In addition, the equilibrium reaction depends on the hydrogen and oxygen gas concentrations.