Vanadium oxide (V2O5) was successfully loaded on tin dioxide (SnO2) nanoparticles using an impregnation method to improve the sensor response for detecting combustible gases in a humid atmosphere. As seen from field-emission scanning electron microscopy images, appropriate pores for gas diffusion are formed on the nanoparticles. The sensor response to combustible gases such as hydrogen and ethanol were evaluated at elevated temperatures in a humid atmosphere, showing clear improvement with 1 wt% V2O5 loading on the SnO2 nanoparticles. The improvement in performance was attributed to the role of V2O5 as an oxygen provider in the air atmosphere with combustible gas and the ability for V2O5 to undergo reduction. Thus, adding a catalytic metal oxide provides a simple way to overcome hydroxyl poisoning on a SnO2 surface.
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