Transient effects of tin oxide CO sensors in the presence of water vapor

 
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1993 (EN)
Transient effects of tin oxide CO sensors in the presence of water vapor (EN)

Skafidas, PD (EN)
Avaritsiotis, JN (EN)
Vlachos, DS (EN)

N/A (EN)

During the experimental study of CO sensitivity of SnO2 resistive-type gas sensors in the presence of water vapor, a transient effect was observed which elucidates the CO sensing mechanism in tin oxide. More precisely, after the removal of CO, an increase of the measured conductance was observed, depending on substrate temperature. An explanation of this phenomenon is proposed, which is based on the conductance modulation due to three different mechanisms: Formate desorption, occupation of lattice sites by oxygen molecules, and diffusion of lattice oxygen vacancies to sensor's bulk. (EN)

journalArticle

GASES (EN)
SNO2 (EN)
SURFACES (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Applied Physics Letters (EN)

English

1993


AMER INST PHYSICS (EN)



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