Abstract
Sulfur dioxide SO 2 is an important decomposition byproduct of sulfur hexafluoride SF 6 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 SO 2 were systematically performed. The measured sensor optimum operating temperature was about 260 °C. Its corresponding maximum response to 30 and 60 ppm of SO 2 were 16.72 and 26.14. The saturated gas concentration of the fabricated sensor to SO 2 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 SO 2 and good stability were also observed.
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