3 years ago

Great enhancement of CH4 sensitivity of SnO2 based nanofibers by heterogeneous sensitization and catalytic effect

Great enhancement of CH4 sensitivity of SnO2 based nanofibers by heterogeneous sensitization and catalytic effect
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.

Publisher URL: www.sciencedirect.com/science

DOI: S0925400517313369

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