Controlled microcstructure oxide coating for chemical sensors
- Sandia National Labs., Albuquerque, NM (USA)
- New Mexico Univ., Albuquerque, NM (USA). Dept. of Chemistry
We have investigated the use of porous oxide coatings, formed using sol-gel chemistry routes, as the discriminating elements of acoustic wave (AW) chemical sensors. These coatings provide several unique advantages: durability, high adsorption capacity based on large surface areas, and chemical selectivity based on both molecular size and chemical interactions. The porosity of these coatings is determined by performing nitrogen adsorption isotherms using the AW device response to monitor the uptake of nitrogen at 77 K. The chemical sensitivity and selectivity obtained with this class of coatings will be demonstrated using several examples: hydrous titanate ion exchange coatings, zeolite/silicate microcomposite coatings, and surface modified silicate films. 16 refs., 3 figs., 1 tab.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6945977
- Report Number(s):
- SAND-90-1078C; CONF-9006171-2; ON: DE90012223
- Resource Relation:
- Conference: Solid state sensor and actuator workshop, Hilton Head Island, SC (USA), 4-7 Jun 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
COATINGS
SOL-GEL PROCESS
GASES
ACOUSTIC DETECTION
LIQUIDS
ION EXCHANGE
MICROSTRUCTURE
POROSITY
SENSITIVITY
THIN FILMS
ACOUSTIC MEASUREMENTS
CHARGED PARTICLE DETECTION
CRYSTAL STRUCTURE
DETECTION
FILMS
FLUIDS
RADIATION DETECTION
400100* - Analytical & Separations Chemistry
360101 - Metals & Alloys- Preparation & Fabrication