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Development of a porous layer catalytically activated for improving gas sensors performances

A screen-printed thick film was developed to be overlapped to a gas sensing device for preserving it from contamination and degradation occurring in hostile environments, and also for improving its selectivity to a single pollutant gas when exposed to a complex atmosphere. This protective layer inco...

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Bibliographic Details
Published in:Ceramics international 2007-01, Vol.33 (7), p.1199-1203
Main Authors: Tulliani, J.M., Moggi, P.
Format: Article
Language:English
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Summary:A screen-printed thick film was developed to be overlapped to a gas sensing device for preserving it from contamination and degradation occurring in hostile environments, and also for improving its selectivity to a single pollutant gas when exposed to a complex atmosphere. This protective layer incorporated Al 2O 3 doped with Cs or Ba oxides as a catalyst material for eliminating gaseous interfering species, precisely CO 2, to improve sensor response to CO. The best performances were obtained by depositing two, successive layers: the lower one, made of an alumina sol with a dispersed commercial α-alumina powder, just plays the role of protecting the sensitive material and electrodes from degradation, while the upper layer was obtained by the deposition of a screen-printable ink made of doped-alumina powders and is able to selectively adsorb CO 2, just allowing CO to interact at the sensing material surface.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2006.04.005