Gas sensor

Details Gas sensor Gas sensor

1984-02-14

1985-04-02

Envall, Jr., Roy N.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

73 23, 73 27R, 422 98, G01N 2712

Patent

active

045090343

ABSTRACT:
A gas sensor comprising an electric resistor of noble metal and a sintered piece of a metal oxide covering the resistor and serving as a semiconductor. The ratio of the combined resistance Ro of the resistor and the semiconductor to the resistance ro of the resistor, Ro/ro, is within the range of 0.45<Ro/ro<0.95. The sintered piece may be prepared from a mixture of SnO.sub.2 powder of usual particle sizes and a superfine powder of SnO.sub.2 by sintering the mixture at about 600.degree. C. to about 800.degree. C.

REFERENCES:
patent: 4206173 (1980-06-01), Yamaguchi et al.
patent: 4242302 (1980-12-01), Kitamura et al.
patent: 4313338 (1982-02-01), Abe et al.
patent: 4396899 (1983-08-01), Ohno
Pink et al., "Preparation of Fast Detecting SnO.sub.2 Gas Sensors", Japanese Journal of Applied Physics, vol. 19, No. 3, Mar. 1980, pp. 513-517.

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