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Semiconductor Gas Sensors by O Tan, R Jaaniso

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7

Semiconducting direct thermoelectric gas sensors

F. Rettig and R. Moos,     University of Bayreuth, Germany

Abstract:

This chapter deals with semiconducting direct thermoelectric gas sensors based on oxide materials. The principle of the sensor is based on a direct measurement of the position of the Fermi level, which can be strongly dependent on the concentration of an analyte in the ambience. The direct thermoelectric gas sensor principle measures a path-independent quantity – the thermovoltage. This makes the sensors extremely resistant to damage stemming from abrasives in gas streams. This chapter shows the importance of developing an adequate transducer, and includes a careful analysis of the sensor signals obtained. From a technological ...

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