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Long-term Durability of Pd/a-WO3 and Pd-Pt/a-WO3 Thin Films for Hydrogen Sensors
진정모,정현식 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
Optical hydrogen safety sensors based on gasochromic thin films can be used to detect the presence of hydrogen by sensing a change in color of the films upon exposure to hydrogen gas in areas where hydrogen leaks are suspected. In addition to the sensitivity to hydrogen, the long-term durability is an essential requirement for applications of these films in commercially viable hydrogen sensors. In this study, we compared the long-term durabilities of Pd/a-WO3 and Pd-Pt/a-WO3 thin films over a period of 5 months in ambient air. The changes in the optical transmittance of the thin films due to the small polaron transition between W6+ and W5+ ions were monitored as the films were exposed to hydrogen gas and air alternately. We found that the Pd-Pt thin film was an effective catalyst for hydrogen sensors with a better durability than the Pd film.
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Comparison of Pd, Pt and Pt/Pd as Catalysts for Hydrogen Sensor Films
심재영,이재동,진정모,정현식,이세희 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.6
Hydrogen has been attracting much interest recently as a source of clean and sustainable energy. However, the volatility of hydrogen, its tendency to explode at concentrations as low as 4 % in air, requires a reliable sensing technology for safe hydrogen utilization. An optical hydrogen safety sensor based on gasochromic thin films can detect a change in color of the film upon exposure to hydrogen gas in an area where a hydrogen leak is suspected. In this study, we compared the sensitivity and the durability of hydrogen sensor films of Pd/WO3, Pt/WO3, and Pt/Pd/WO3. The change in the optical transmittance of the films was measured as these films were repeatedly exposed to hydrogen and air. Hydrogen has been attracting much interest recently as a source of clean and sustainable energy. However, the volatility of hydrogen, its tendency to explode at concentrations as low as 4 % in air, requires a reliable sensing technology for safe hydrogen utilization. An optical hydrogen safety sensor based on gasochromic thin films can detect a change in color of the film upon exposure to hydrogen gas in an area where a hydrogen leak is suspected. In this study, we compared the sensitivity and the durability of hydrogen sensor films of Pd/WO3, Pt/WO3, and Pt/Pd/WO3. The change in the optical transmittance of the films was measured as these films were repeatedly exposed to hydrogen and air.
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