Method of forming solid state humidity sensor

Details Method of forming solid state humidity sensor Method of forming solid state humidity sensor

1996-01-16

1998-04-21

Pianalto, Bernard

Coating processes

Electrical product produced

Metallic compound coating

101483, 427265, 427314, 427404, 4274192, 4274301, B05D 512

Patent

active

057415404

ABSTRACT:
A method for forming a solid state humidity sensor is disclosed which comprises the steps of: (a) dissolving a tungstate salt into an aqueous solution; (b) adjusting the pH of the aqueous tungstate salt solution to below 8.5; (c) forming one or a pair of electrodes on an insulating substrate; (d) placing the substrate into the pH-adjusted aqueous tungstate salt solution and heating the aqueous solution containing the substrate at temperatures above 70.degree. C. to thereby form a pyrochlore-type crystalline tungsten trioxide film over the electrode or pair of electrodes; and (e) forming another electrode over the pyrochlore-type crystalline tungsten trioxide film if only one electrode is formed during step (c). Alternatively, the pyrochlore-type crystalline tungsten trioxide film can be formed over or between the electrodes by heating the pH-adjusted aqueous tungstate salt solution to cause a precipitation of pyrochlore-type crystalline tungsten trioxide, then screen-printing the pyrochlore-type crystalline tungsten trioxide powder on one or both of the electrodes to thereby form a humidity sensing element. The pyrochlore-type crystalline tungsten trioxide is represented by the general formula of(M.sub.2 O).sub.x WO.sub.3.zH.sub.2 O, in which M is a cation, x is about 0.5, and z, which is the amount of crystalline water contained in said crystal, is typically less than 2.

REFERENCES:
patent: 4635027 (1987-01-01), Miyoshi et al.
patent: 5001453 (1991-03-01), Ikejiri et al.

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