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Hydrogen sulfide (H 2 S) is an important decomposition component of sulfur hexafluoride (SF 6 ), which has been extensively used in gas-insulated switchgear (GIS) power equipment as insulating and arc-quenching medium. In this work, electrospun ZnO-SnO 2  composite nanofibers as a promising sensing material for SF 6  decomposition component H 2 S were proposed and prepared. The crystal structure and morphology of the electrospun ZnO-SnO 2  samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The composition of the sensitive materials was analyzed by energy dispersive X-ray spectrometers (EDS) and X-ray photoelectron spectroscopy (XPS). Side heated sensors were fabricated with the electrospun ZnO-SnO 2  nanofibers and the gas sensing behaviors to H 2 S gas were systematically investigated. The proposed ZnO–SnO 2  composite nanofibers sensor showed lower optimal operating temperature, enhanced sensing response, quick response/recovery time and good long-term stability against H 2 S. The measured optimal operating temperature of the ZnO–SnO 2  nanofibers sensor to 50 ppm H 2 S gas was about 250°C with a response of 66.23, which was 6 times larger than pure SnO 2  nanofibers sensor. The detection limit of the fabricated ZnO–SnO 2  nanofibers sensor toward H 2 S gas can be as low as 0.5 ppm. Finally, a plausible sensing mechanism for the proposed ZnO–SnO 2  composite nanofibers sensor to H 2 S was also discussed.

Electrospun ZnO–SnO2 Composite Nanofibers and Enhanced Sensing Properties to SF6 Decomposition Byproduct H2S