LAUSR

Abstract SnO2 has become one of the hot materials for research at this stage due to the advantages of simple preparation, low cost and stable properties. In this study, SnO2/SiO2 nanocomposites were prepared by the sol-gel method. The structure, properties and morphology of the SnO2 nanoparticles were determined by HRTEM, SEM, XPS FTIR and XRD characterization. Compared with the pure SnO2 material, the SnO2/SiO2 composite has superior gas sensing properties to triethylamine. The test results demonstrate that the optimal temperature of the SnO2/SiO2 sensor is 280 °C, which is 45 °C lower than before doping. At 280 °C, the sensitivity to 100 ppm triethylamine was 18, which was 2.4 times higher than that before doping. The SnO2/SiO2 sensor can detect triethylamine with a minimum concentration of 500 ppb. In addition, the gas-sensitive mechanism of SnO2/SiO2 to triethylamine was illustrated.