Aerosol-deposited BaFe₀.₇Ta₀.₃O₃₋δ for nitrogen monoxide and temperature-independent oxygen sensing

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Bektas, Murat ; Hanft, Dominik ; Schönauer-Kamin, Daniela ; Stöcker, Thomas ; Hagen, Gunter ; Moos, Ralf:
Aerosol-deposited BaFe₀.₇Ta₀.₃O₃₋δ for nitrogen monoxide and temperature-independent oxygen sensing.
In: Journal of Sensors and Sensor Systems. Bd. 3 (2014) Heft 2 . - S. 223-229.
ISSN 2194-878X
DOI: https://doi.org/10.5194/jsss-3-223-2014

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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.