CO sensing with SnO2-based thick film sensors: Surface state model for conductance responses during thermal-modulation

There exists a strong interest in developing simplified models able to predict the SnO2 sensor response and aiming at a better comprehension of the mechanisms involved with sensing operation. In this paper, a simple grey-box model is proposed for predicting, with a good approximation (r.m.s. error &...

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Published in:Sensors and actuators. B, Chemical Chemical, 2006-07, Vol.116 (1-2), p.43-48
Main Authors: Fort, A., Rocchi, S., Serrano-Santos, M.B., Mugnaini, M., Vignoli, V., Atrei, A., Spinicci, R.
Format: Article
Language:English
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Summary:There exists a strong interest in developing simplified models able to predict the SnO2 sensor response and aiming at a better comprehension of the mechanisms involved with sensing operation. In this paper, a simple grey-box model is proposed for predicting, with a good approximation (r.m.s. error < 10%), the behavior of some commercial SnO2-based sensors in presence of oxygen and a reducing gas (CO) during fast temperature variations. Auger electron spectroscopy (AES) permitted to highlight differences in the surface composition of the sensors after extended operation time.
ISSN:0925-4005
DOI:10.1016/j.snb.2005.11.070