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Tin dioxide (SnO 2) gas sensors with reliable sensing properties and low-cost are most desired for application in the detection of hazardous gases in heavy industries, 1,2 in-house safety monitoring, 3 and food quality control. 4 Most SnO 2based gas sensors are formed by a single heated layer of sensing material deposited over a pair of electrodes, which usually needs high operating temperatures (200-400ºC) to achieve their most desirable sensing response. 3,

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