ZnO Synthesized by Hard Templating with Coal-Based Carbon Used as Gas-Sensing Material in Detection of Lowly-Concentrated Ethanol Gas
With coal-based carbon as a hard template and zinc acetate as zinc source,a kind of ZnO nanomaterial with excellent crystal structure and pore properties was synthesized by adopting high-temperature roasting process.Then,the sensitivity of a gas sensor based on this ZnO nanomaterial to ethanol gas was investigated.The results are shown as follows:such ZnO sensor at 200℃presents higher sensitivity to lowly-concentrated ethanol gas,with a response value of 5.25;the response time and recovery time of the ZnO sensor to the ethanol gas with concentration of 1×10-5are 10 s and 6 s respectively;the ZnO sensor has its sensitivity to ethanol gas in a linear relationship with the concentration of ethanol gas,and can detect the lowest concentration level of 1×10-7;the ZnO sensor has a lower sensitivity to those kinds of gas,including acetic acid,methanol,ammonia and methane.Due to its higher sensitivity to ethanol gas,it is concluded that such sensor presents excellent selectivity in gas detection.
gas sensorgas-sensing materialcoal-based carbonhard templatingzinc oxideethanolgas sensitivity
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