Abstract
To elaborate the effect of CeO2 nanoparticles on the sensing properties of SnO2, CeO2-functionalized SnO2 wire-in-tube nanofibers (WITN) was prepared by electrospinning and subsequently impregnating treatment. The gas sensing studies revealed that the CeO2 loaded SnO2 WITN exhibited enhanced sensitivity to ethanol compared to the pristine SnO2. With increasing amount of CeO2, the response of nanocomposites increases firstly and then decreases. And the response of nanocomposites to ethanol reach maximum when the concentration of impregnated Ce (NO3)3·6H2O is 0.03 mol·L-1. To detail the sensing mechanism, the X-ray photoelectron spectroscopy was firstly employed to detect the variation in oxygen species corresponding to different amounts of CeO2, but no obviously changes in oxygen species was detected. Subsequently, it was found that the initial resistance of CeO2@SnO2 WITN was higher than pristine SnO2, which could be beneficial to the improvement of sensing properties. More importantly, oxygen vacancy (mainly offered by CeO2 nanoparticles) was proved to be positively correlated to their gas-sensing performance. In this work, the electronic sensitization mechanism based on CeO2 loaded SnO2 was detailed, which could help for the better understanding the sensitization effect of rare earth element on semiconductor oxides.
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