Modelling and simulation of tin oxide based thick-film gas sensors using Monte Carlo techniques

An advanced model has been developed to explain the experimental results obtained from tin oxide sensors in the presence of carbon monoxide and/or water vapor. The basic principles of the proposed model applied to the simulation are that (a) there is a reduction of the tin oxide surface by both CO a...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 1994-04, Vol.19 (1), p.724-728
Main Authors: Skafidas, P.D., Vlachos, D.S., Avaritsiotis, J.N.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
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Summary:An advanced model has been developed to explain the experimental results obtained from tin oxide sensors in the presence of carbon monoxide and/or water vapor. The basic principles of the proposed model applied to the simulation are that (a) there is a reduction of the tin oxide surface by both CO and wter vapor, (b) at low temperatures,the oxygen vacancies cannot be refilled, (c) in the presence of both CO and water vapor, formate species are formed which, when they desorb, increase the sensor's resistance, and (d) hydroxyl species increase the electron availability and thus the sensitivity in CO. Simulation results are in excellent qualitative agreement with the experimental ones.
ISSN:0925-4005
1873-3077
DOI:10.1016/0925-4005(93)01222-P