Influence of Humidity on the CO Sensitivity of a New Gas Sensor Based on SnO2 Nanoparticles Surface-Doped with Palladium and Platinum

Abstract : In this paper, we show the influence of two doping agents Palladium and Platinum on the sensitivity for CO sensing of the nanoparticular SnO2 sensors at an operating temperature of 450°C. It is well known that the evolution of the conductance of the sensitive layer is largely modified by doping. A study carried out to measure the influence of humidity demonstrates that if un-doped sensors show a variation of same sign but less important than in dry air, doped sensors display a very different behavior. Indeed, we obtain a point of null sensitivity between 0 and 10%RH (RH = relative humidity) and a strong inverse sensitivity above 15% RH. These results demonstrate the presence of unexpectedly different chemical operating modes for CO sensing according to the rate of humidity.
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Philippe Menini, F. Parret, M. Guerrero, A. Martinez, K. Soulantika, et al.. Influence of Humidity on the CO Sensitivity of a New Gas Sensor Based on SnO2 Nanoparticles Surface-Doped with Palladium and Platinum. Eurosensors XVII, Sep 2003, Guimaraes, Portugal. pp.873. ⟨hal-02160594⟩

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