One-dimensional fiber-like SnO2 nanomaterials (SnO2 nanofibers) were prepared by ‘green’ preparation approach that using shaddock peels as bio-templates via a facile hydrothermal method for the first time. The microstructure, morphology, chemical states and specific surface areas were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N2 adsorption–desorption, respectively. Results indicating the as-synthesized SnO2 are fiber-like structures and composed of numerous nanoparticles, and with large specific surface areas (36.50 m2 g−1). The XPS spectra confirms that the existence of adsorbed oxygen (Oads) on the surface of product, which may lead to the response of gas sensor. The gas-sensing properties of the sensor based on SnO2 nanofibers for volatile organic compounds (VOCs) were investigated, such as methanol, ethanol, isopropanol, acetone, formaldehyde and n-butanol. The sensor showed high gas response, low detection limit and fast response towards various VOCs gases at the optimal operating temperature of 260 °C. These results demonstrated the potential of using as-synthesized SnO2 nanofibers for VOCs gases detection. In addition, the possible formation mechanism and the gas-sensing mechanism were also discussed.
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This work was supported by the Department of Science and Technology of Yunnan Province via the Key Project for the Science and Technology (Grant No. 2017FA025), National Natural Science Foundation of China (Nos. 61761047 and 41876055) and Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province.