Zeolite cover layer for selectivity enhancement of p-type semiconducting hydrocarbon sensors

Titelangaben

Sahner, Kathy ; Schönauer-Kamin, Daniela ; Kuchinke, Petra ; Moos, Ralf:
Zeolite cover layer for selectivity enhancement of p-type semiconducting hydrocarbon sensors.
In: Sensors and Actuators B: Chemical. Bd. 133 (2008) Heft 2 . - S. 502-508.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2008.03.014

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Abstract

Screen-printed thick films of the p-type semiconducting materials family SrTi1−xFexO3−δ have been investigated for hydrocarbon sensing. Among the different compositions tested, the formulations containing 10 and 20% of iron are found to perform best for this purpose. A pronounced cross-interference of NO persisted at operating temperatures of about 400 °C. In order to eliminate this problem, the application of a zeolite cover layer was studied. The properties of this cover layer were optimized with respect to layer thickness and Pt content. Using initial results of a catalytic study on the zeolite powder in addition to a simple diffusion–reaction model, the effect of the zeolite layer with respect to NO cross-interference could be explained satisfactorily.