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Preparation and gas-sensing properties of SnO2/graphene quantum dots composites via solvothermal method

Chu, Xiangfeng, Wang, Jiulin, Zhang, Jun, Dong, Yongping, Sun, Wenqi, Zhang, Wangbing, Bai, Linshan
Journal of materials science 2017 v.52 no.16 pp. 9441-9451
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, acetone, graphene, graphene oxide, nanocomposites, nitrogen, quantum dots, scanning electron microscopy, transmission electron microscopy, vapors
SnO₂/graphene quantum dots (GQDs) nano-composites were prepared via solvothermal method (160 °C, 10 h), in which graphene quantum dots were synthesized from graphene oxide by one-step solvothermal method. The nano-composites were characterized by means of HRTEM, XRD, SEM, FTIR, XPS and N₂ adsorption–desorption, respectively. The sensor devices were fabricated using SnO₂/GQDs nano-composites as sensing materials. The effect of the GQDs content on the gas-sensing responses and the gas-sensing selectivity was investigated. The experimental results showed that the sensor based on SnO₂/GQDs nano-composite (S-2) exhibited good response and good selectivity to acetone vapor. When operating at 275 °C, the responses of the sensor based on SnO₂/GQDs nano-composite (S-2) to 1000 and 0.1 ppm acetone reached 120.6 and 1.3, respectively; the response time and the recovery time for 1000 ppm acetone were 17 and 13 s, respectively.