Abstract
In this study, unloaded and Pt-loaded SnO2 nanofibers (NFs) with 100–150nm diameters were synthesized by a simple electrospinning technology and then calcined at 600°C in air. It was observed that the Pt-SnO2 NFs were comprised of strings of tiny SnO2 nanoparticles decorated with Pt and PtO nanoparticles, resulting in the formation of PtO/SnO2 heterojunction and high porosity. And then, we studied the methane (CH4) sensing performance of the sensors fabricated from these NFs and found that 20mol% Pt-SnO2 NFs exhibited excellent CH4 sensing properties over a temperature range of 100–350°C, for example, the 20mol% Pt-SnO2 NFs showed an obvious response of 1.11–1ppm CH4 at 350°C, which was 2 orders of magnitude lower than the minimum detection limit of the current SnO2 based CH4 sensors. The great enhancement of the CH4 sensing properties of Pt-SnO2 NFs can be understood by the PtO/SnO2 heterogeneous sensitization and Pt catalytic effect. Our findings present a novel strategy for the application of SnO2 based NFs in highly effective CH4 detection.
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