Abstract
Hollow spheres of SnO2 (Tin oxide) have been successfully synthesized by using a one-step calcined method and the products were uniform after heating SnO2 crystals at 500°C for an hour, the range of diameter is from 300 to 900nm. We successfully used only one reagent (stannous octoate) without any catalyst or surfactant to synthesize SnO2 crystals, in which was fast, simple and reproducible. Gas sensors based on these SnO2 microspheres exhibited excellent selectivity, fast response, and good selectivity to 1–300ppm ethanol vapor at 320°C. It has shown great sensitivity at a low concentration (1ppm) and operating temperature pointing out that the SnO2 microsphere is an ideal potential material for ethanol sensors.
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