CO consumption of Pd doped SnO2 based sensors

The CO consumption of tin dioxide, thick film sensors and their sensor signals have been investigated in order to study the GO-water interaction on the SnO2 surface. The mechanism of CO combustion, and the influence of the sensor's operation temperature (200-400 degreesC) and ambient humidity (0-50% r.h.) on the combustion has been characterised in detail. Here, the overall CO consumption of the sensors has been divided according to the contributions of the various individual sensor parts: alumina substrate; electrodes: heater; and the SnO2 based sensitive layer. It can be shown that CO combustion is a linear function of CO concentration. The influence of the substrate on total CO consumption has been proven to be significant. (C) 2001 Elsevier Science B.V. All rights reserved.