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The detection of nitrogen dioxide (NO 2) is essential for the environment and human health. Tin dioxide (SnO 2) based sensors have demonstrated capabilities to detect NO 2 , while their response, response/recover speed and selectivity are not good enough for their practical applications. To address these issues, the SnO 2 nanoparticles doped with reduced graphene oxides (rGO) have been synthesized by using a facile microwave-assisted gas-liquid interfacial solvothermal method in this work. The NO 2 sensing performances have been greatly enhanced after the doping of rGO due to the improved electronic conductivity and the formation of the p-n junction in the as-synthesized SnO 2 /rGO nanocomposites. Moreover, our results demonstrate that the sensors based on the SnO 2 /(0.3%)rGO nanocomposites (with an average diameter about 10-15 nm) exhibit the best overall performance with the high response of 247.8 to 10 ppm NO 2 , fast response/recovery speed (39 s/15 s) and the excellent selectivity at the working temperature of 200 ℃. Remarkably, the SnO 2 /(0.3%)rGO sensors still exhibit a good gas sensing performance to NO 2 even at room temperature.

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