aerosol-deposited bafe0.7ta0.3o3-δ for nitrogen monoxide and temperature-independent oxygen sensing
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2014
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Abstract
The gas sensing properties of resistive gas sensors of
BaFe0.7Ta0.3O3-δ (BFT30) prepared by the so-called
aerosol deposition method, a method to manufacture dense ceramic films at
room temperature, were investigated. The electrical response of the films
was investigated first under various oxygen concentrations and in a wide
temperature range between 350 and 900 °C. Between 700 and 900 °C, the conductivity of
BaFe0.7Ta0.3O3-δ (BFT30) depends on the oxygen
concentration with a slope of almost 1/4 in the double-logarithmic plot vs.
oxygen partial pressure. In addition, the sensor response is temperature
independent. BFT30 responds fast and reproducibly to changing oxygen partial
pressures even at 350 °C. The cross-sensitivity has been
investigated in environments with various gases (C3H8, NO,
NO2, H2, CO, CO2, and H2O) in synthetic air between 350 and 800 °C. BFT30 exhibits good sensing properties
to NO between 350 and 400 °C in the range from 1.5
to 2000 ppm with a high selectivity to the other investigated gas
species. Thus this semiconducting ceramic material is a good candidate for a
temperature-independent oxygen sensor at high temperatures with the
application in exhausts and for a selective nitrogen monoxide (NO) sensor at
low temperatures for air quality monitoring.
| Reference Key |
bektas2014journalaerosol-deposited
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|---|---|
| Authors | ;M. Bektas;D. Hanft;D. Schönauer-Kamin;T. Stöcker;G. Hagen;R. Moos |
| Journal | arabic literature in the post-classical period |
| Year | 2014 |
| DOI |
10.5194/jsss-3-223-2014
|
| URL | |
| Keywords |
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