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SnO2 nanoparticles-reduced graphene oxide nanocomposites for NO2 sensing at low operating temperature

2013; Elsevier BV; Volume: 190; Linguagem: Inglês

10.1016/j.snb.2013.08.067

1873-3077

Hao Zhang, Jianchao Feng, Teng Fei, Sen Liu, Tong Zhang,

Electrochemical sensors and biosensors

SnO2 nanoparticles-reduced graphene oxide (SnO2-rGO) nanocomposites have been successfully prepared by a facile method via hydrothermal treatment of aqueous dispersion of GO in the presence of Sn salts. The combined characterizations including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) indicate the successful formation of SnO2-rGO nanocomposites. To demonstrate the product on sensing application, gas sensors are fabricated using SnO2-rGO nanocomposites as sensing materials and investigated for detection of NO2 at low operating temperature (50 °C). It is found that SnO2-rGO nanocomposites exhibit high response of 3.31 at 5 ppm NO2, which is much higher than that of rGO (1.13), and rapid response, good selectivity and reproducibility. Furthermore, the reason for enhancing sensing performance by addition of SnO2 nanoparticles has also been discussed.