Novel room temperature carbon monoxide sensor utilizing rate of change of resistance in thick films of tin oxide

Autor:	A. G. Keeling, E. W. Williams, R.D. Gould, C. M. Lawlor
Rok vydání:	1994
Předmět:	Smoke Range (particle radiation) Fabrication Materials science business.industry Analytical chemistry Nanotechnology Tin oxide Catalysis chemistry.chemical_compound Semiconductor chemistry Electrical and Electronic Engineering Porosity business Carbon monoxide
Zdroj:	International Journal of Electronics. 76:815-820
ISSN:	1362-3060 0020-7217
DOI:	10.1080/00207219408925983
Popis:	A room temperature thick-film semiconductor gas sensor has recently been developed in this laboratory for the measurement of carbon monoxide (CO) concentrations down to 10ppm. Novel features of the fabrication process are the addition of a catalytic additive to enhance the sensitivity to CO, and a binding agent which results in an open porous structure to increase the effective surface area. The resistance R 0 of sensors before exposure to CO varies in the range 100kΩ-30MΩ, and the rate of change of sensor resistance dR/dt after exposure to CO is large, attaining a maximum value after several minutes. It is shown that the average rate of change of sensor resistance dR/dt is directly proportional to R 0 with proportionality constant 10−3s−1. Circuitry is described, based on detection of the rate of change of sensor resistance, for a CO gas sensor capable of detecting small concentrations at the onset of a fire, before smoke particles are emitted.
Databáze:	OpenAIRE
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