Abstract
WO3 nanosheets was prepared by an acidification method and the Rh catalyst was dispersed on the surface of the nanosheets with a wet impregnation method. The morphology of pristine WO3 and Rh modified WO3 nanosheets and their responses to acetone gas were studied. According to oxygen adsorption combined with TPR results, the sensing and sensitization mechanism of acetone were discussed. It was found that no visible changes in nanostructures or morphologies were observed in WO3 nanosheets with Rh, however, the sensor resistance and sensor response were greatly promoted. The basic sensitization mechanism could be caused by the electronic interaction between oxidized Rh and WO3 surface.
Highlights
Acetone gas is closely related to people with diabetes
Rh as a noble catalyst was dispersed onto the surface of WO3 nanosheets through a wet impregnation method
Experimental results indicated that Rh was in a form of oxidized state Rh2O3 on WO3 surface and an excessive amount of Rh can lead to an aggregation of Rh2O3 and poor sensitization effect as well
Summary
Acetone gas is closely related to people with diabetes. Medical research has shown that there is a significant difference of acetone concentration in the breath for diabetics and healthy people, the former being higher than 1.8 ppm and the latter being below 0.8 ppm (Owen et al, 1982; Natale et al, 2014). There was one weak peak around 370◦C observed in pristine WO3 nanosheets indicating a weak consumption of H2, which may be due to the weak reduction behavior of WO3 surface at a high temperature (Li et al, 2018).
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