Photopyroelectric Pd-PVDF hydrogen sensor
Date
1989Publisher
Publ by IEEESource
Ultrasonics Symposium ProceedingsIEEE 1989 Ultrasonics Symposium
Volume
1Pages
613-616Google Scholar check
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A novel hydrogen sensor made of thin, commercially available polyvinylidene difluoride (PVDF) pyroelectric film sputter-coated with palladium (Pd) is described. An infrared laser beam, produced by an infrared (ca. 800-nm) semiconductor laser, created alternating temperature gradients on the Pd-PVDF and on reference Ni-Al-PVDF films, which, in turn, generated AC voltages due to the photopyroelectric effect. Exposure to hydrogen gas produces an increased differential signal between the Pd and reference electrodes this is tentatively attributed to the adsorption and dissociation of hydrogen molecules on the Pd surface, which caused a shift on the Pd-PVDF pyroelectric coefficient, due to interactions at the Pd-PVDF interface. The differential signal has been found to follow a Langmuir isotherm in the range of 4 to 200 Pa. Other characteristics such as the response times, the reversibility, and the durability of the photopyroelectric sensor also are studied.