8.5.2 Anomalous Gasochromic Response Behavior in Hydrogen Sensing with Pt/WO3 Film at Low Temperature Range

S. Okazaki, R. Yamasaki & S. Johjima
Gasochromic characteristics of sol-gel derived Pt/WO3 film as a hydrogen sensitive material was evaluated at various temperatures in the near-infrared region by optical transmittance measurements. The sensitivity of the film was high and more than 60% transmittance change was observed at room temperature and higher, with 4 % H2/N2 balance gas. The curves may be approximated by exponential response. The response speed was fast and the 63% response time was about 5 sec. at 25...