Thin film porous membranes based on sol-gel chemistry for catalytic sensors
Nanoporous sol-gel based films are finding a wide variety of uses including gas separations and supports for heterogeneous catalysts. The films can be formed by spin or dip coating, followed by relatively low temperature annealing. The authors used several types of these films as coatings on the Pd alloy thin film sensors they had previously fabricated and studied. The sol-gel films have little effect on the sensing response to H{sub 2} alone. However, in the presence of other gases, the nanoporous film modifies the sensor behavior in several beneficial ways. (1) They have shown that the sol-gel coated sensors were only slightly poisoned by high concentrations of H{sub 2}S while uncoated sensors showed moderate to severe poisoning effects. (2) For a given partial pressure of H{sub 2}, the signal from the sensor is modified by the presence of O{sub 2} and other oxidizing gases.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 658200
- Report Number(s):
- SAND-97-3124C; CONF-980727-; ON: DE98005009; BR: DP0102022; TRN: AHC2DT06%%84
- Resource Relation:
- Conference: 7. international meeting on chemical sensors, Beijing (China), 27-30 Jul 1998; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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