Research on Sensitization Effect of Ceria Nanoparticles on Tin Oxide Wire-in-Tube Nanofibers

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.

• Periodical: Key Engineering Materials (Volume 735)
• Pages: 175-179
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.735.175
• Online since: May 2017
• Authors: Ye Li Gong, Jin Jin Wu*, Da Wen Zeng
• Keywords: CeO₂ Nanoparticles, Electronic Sensitization, SnO₂, Wire-in-Tube Nanofibers

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