Influence of Synthesis on Constitution and Gas Sensing Property of SnO2 Nanomaterial

Abstract

In this paper, nanostructure SnO₂ was prepared by dissolving tin granule in citric acid and gaining the precursor, which was treated with different ways and calcinated. The influence of treatment with the precursor on the gas sensing property of SnO₂ was studied. The precursor was treated with different methods and calcined at different temperature. SnO-doping SnO₂ was prepared from annealing the washed precursor and pure SnO₂ was synthesized from annealing the unwashed precursor. Four nanomaterials were obtained. The phases, constitution, morphology of them were characterized by XRD and SEM. Gas sensors were fabricated and an investigation into the SnO₂-based gas-sensing properties has been conducted. Compared to SnO-doping SnO₂, pure SnO₂ sensor shows much better gas sensing properties. It is more sensitive to H₂S, Cl₂, C₂H₅OH and HCHO than SnO-doping SnO₂.