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. 2015 Mar 11;5:8939. doi: 10.1038/srep08939

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(a) SEM image of pure SnO₂ monolayer porous film; (b) Sensitivities of SnO₂-rGO and pure SnO₂ monolayer porous film sensor varied with the working temperature in detecting 200 ppm ethanol gas. The two films were obtained by the same procedure.