Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 254, Issue -, Pages 393-401Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.07.128
Keywords
Methane sensor; Heterojunction; Catalytic effect; Electrospinning; Nanofibers
Funding
- Natural Science Foundation of China [11374372]
- Taishan Scholar Foundation [ts20130929]
- Fundamental Research Funds for the Central University [15CX08009A]
- Natural Science Foundation of Shandong Province [ZR2015AQ012]
- Graduate Innovation Fund of China University of Petroleum [YCX2017069]
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In this study, unloaded and Pt-loaded SnO2 nanofibers (NFs) with 100-150 nm diameters were synthesized by a simple electrospinning technology and then calcined at 600 degrees C in air. It was observed that the Pt-SnO2 NFs were comprised of strings of tiny SnO2 nanoparticles decorated with Pt and PtO nanopartides, 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 20 mol% Pt-SnO2 NFs exhibited excellent CH4 sensing properties over a temperature range of 100-350 degrees C, for example, the 20 mol% Pt-SnO2 NFs showed an obvious response of 1.11-1 ppm CH4 at 350 degrees 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. (C) 2017 Elsevier B.V. All rights reserved.
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