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Responsive characteristics of hierarchical zinc oxide sensor to SF6 decomposition byproduct SO2

Sulfur dioxide SO2 is an important decomposition byproduct of sulfur hexafluoride SF6 under partial discharge in GIS apparatus. Responsive characteristics of semiconductor chemical gas sensors can be extremely improved by morphology tailoring of the sensing materials. In this manuscript, hierarchical flower-shaped ZnO sensing materials were synthesized with an environmental-friendly hydrothermal method and characterized by X-ray powder diffraction, scanning electron microscope, and energy dispersive X-ray spectroscopy, respectively. Planar chemical gas sensor was prepared and obtained with the synthesized powders and its responsive characteristics towards SO2 were systematically performed. The measured sensor optimum operating temperature was about 260 °C. Its corresponding maximum response to 30 and 60 ppm of SO2 were 16.72 and 26.14. The saturated gas concentration of the fabricated sensor to SO2 was 2000 ppm with a response value of 67.41. Moreover, a quick response and recovery feature of 7s and 8 s versus 80 ppm of SO2 and good stability were also observed.