Abstract
A hierarchical SnO2 nanosheet structure was constructed by the hydrothermal method using hydrated stannous chloride and thiourea as raw materials. Then lysine was used as a coupling agent to load Pt nano quantum dots with different contents on the surface of the SnO2 nanosheets. The composition, morphology and structure of Pt/SnO2 were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and energy dispersive spectroscopy. The gas sensitivity of the Pt/SnO2 and SnO2 nanostructures were also studied in detail. Compared with the pure SnO2 nanosheets, the 3-dimensional structured nano 2.0% Pt/SnO2 (Pt: SnO2 = 2.0%, wt%) exhibits a higher gas sensitivity to ethanol gas at 240 °C. The gas sensitivity to 100 ppm ethanol of hierarchical nano 2.0% Pt/SnO is 2.5 times higher than pure SnO2 nanosheet, and the response time and recovery time are 4 s and 5 s, showing excellent response and recovery behavior. Meanwhile, the sensor also exhibits a lower detection limit of 0.272 ppm, as well as the excellent temperature and time stability. The higher gas sensitivity is contributed from the "spillover" effect of Pt nano quantum dots and the Schottky barrier at the heterojunctions of hierarchical Pt/SnO2 nanostructures.
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