Influence of humidity on CO sensing with p-type CuO thick film gas sensors

Influence of humidity on CO sensing with p-type CuO thick film gas sensors

A model for the detection of CO in the presence of humidity is proposed for thick porous film gas sensors based on p-type CuO. The sensing mechanism is investigated by means of simultaneous DC electrical resistance and work function changes measurements combined with appropriate modeling of the cond...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2011-04, Vol.153 (2), p.347-353
Main Authors: Hübner, M., Simion, C.E., Tomescu-Stănoiu, A., Pokhrel, S., Bârsan, N., Weimar, U.
Format: Article
Language:eng
Subjects:
Actuators
air
Carbon monoxide
COPPER OXIDE
CuO
CUPRIC OXIDE
Detection
electrical resistance
ELECTRONIC PRODUCTS
Gas sensors
Humidity
ions
Modeling
OXIDES
oxygen
p-Type MOX
Thick films
Tin dioxide
Tin oxides
Water cross-interference
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Summary:A model for the detection of CO in the presence of humidity is proposed for thick porous film gas sensors based on p-type CuO. The sensing mechanism is investigated by means of simultaneous DC electrical resistance and work function changes measurements combined with appropriate modeling of the conduction in the polycrystalline sensing film. The experiments were performed at 150 °C in dry and humid air backgrounds. The conclusion is that, very similarly to the case of undoped SnO 2, the explanation of the cross-interference of water in the CO detection is the fact that both react with pre-adsorbed oxygen ions.
ISSN:0925-4005
1873-3077