Carbon monoxide detecting device

Details Carbon monoxide detecting device Carbon monoxide detecting device

1978-07-13

1980-09-23

Turk, Arnold

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

73 23, 338 34, G01N 2704

Patent

active

042242800

ABSTRACT:
A carbon monoxide detecting device which exhibits a stepwise change in film current over a preselected range in carbon monoxide concentration is disclosed.
According to the present invention, in one embodiment, a first film predominantly of stannic oxide (SnO.sub.2) is formed on an insulating layer, and a second film predominantly of platinum (Pt) is formed on said first film. The second film is of an average film thickness of about 0.3 to 30 platinum atom layers. In another embodiment, gold (Au) is incorporated into said second film, and the second film is of an average film thickness of about 0.3 to 30 platinum atoms and the amount of gold ranges up to 50 atomic percent of the amount of platinum. In a third embodiment, a donor selected from the group consisting of antimony (Sb) and bismuth (Bi) is incorporated into the first film, and an intermediate film predominantly of stannic oxide (SnO.sub.2) having an acceptor selected from the group consisting of platinum (Pt), aluminum (Al), and boron (B) is formed intermediate said first and second films. The first, intermediate, and second films are formed, for example, by a high frequency reactive sputtering method.

REFERENCES:
patent: 3479257 (1969-11-01), Shaver
patent: 3901067 (1975-08-01), Boardman, Jr. et al.
patent: 4030340 (1977-06-01), Chang
patent: 4066413 (1978-01-01), Segawa et al.

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