Coupled Microstructural and Transport Effects in p-type Perovskites for Hydrocarbon Sensing

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TypeArticle
Journal titleMateriaᴌy Ceramiczne / Ceramic Materials
Volume62
Issue4
Pages442448; # of pages: 7
SubjectPerovskite; Hydrocarbon sensing; Propane; Propene; Modeling
AbstractThe chemical gas sensor system of propane (C3H8) and propene (C3H6) detection in a SrTi0.8Fe0.2O3 matrix was considered. A model was formulated which incorporated the coupled processes of gases diffusing into a porous ceramic and then participating in two chemical reactions: a reversible oxygen adsorption and a two-step surface reaction which consumed the target gas. Microstructural properties of the sensor matrix were coupled with the diffusion and surface chemistry processes. The base state of the electroceramic material was determined through the solution of its equilibrium defect chemistry. This simulation represents a modeling advance as it is the first to couple spatial variation of microstructural properties with diffusing gas species and the attendant surface chemistry and electroceramic properties, to predict sensor response as a function of film thickness and morphology. The results presented here compare well with experimental measurements over a broad range of conditions. This model validation will be a useful design tool for ensuing materials research work towards improved sensor device development.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52877
NPARC number17719190
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Record identifier4bf3b781-0b55-45f2-a8b7-054f0f3eb426
Record created2011-05-18
Record modified2016-05-09
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