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ElectroComponent Science and Technology
Volume 10 (1983), Issue 2-3, Pages 151-156

Digital Carbon Monoxide Detector /11/

Service de Chimie Inorganique, Université de l'Etat à Mons, Mons B-7000, Belgium

Received 3 October 1981; Accepted 2 November 1981

Copyright © 1983 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The switch off concentration phenomena in carbon monoxide oxidation on platinum and the parallel steep variation of resistance or surface potential of thin platinum films are used to develop a carbon detector. Coating the platinum film with an increasing thickness of polytetrafluorethylene (PTFE) makes this switch off point move to increasing CO concentrations. Therefore a series of electrical elements, platinum thin film resistances, platinum M.O.S. diodes or platinum gate M.O.S. transistors covered by calibrated thicknesses of PTFE will switch off at well determined CO concentrations and can continue the basis of a digital detector.