J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (2): 157-160.DOI: 10.1016/j.jmst.2012.11.007

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Reduced Graphene Oxide Mediated SnO2 Nanocrystals for Enhanced Gas-sensing Properties

Yanhong Chang1), Yunfeng Yao1,2), Bin Wang2), Hui Luo3), Tianyi Li1), Linjie Zhi2)   

  1. 1) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2) National Center for Nanoscience and Technology, Beijing 100190, China
    3) School of Chemical and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2012-05-27 Revised:2012-08-17 Online:2013-02-28 Published:2013-03-01
  • Contact: Yanhong Chang
  • Supported by:

    University of Science and Technology Beijing, National Center for Nanoscience and Technology Beijing and the National Basic Research Program of China (No. 2007CB714304).

Abstract:

SnO2ereduced graphene oxide (SnO2erGO) composites were prepared via a hydroethermal reaction of graphene oxide (GO) and SnCl2?2H2O in the mixed solvent of ethylene glycol and water. During the redox reaction, GO was reduced to rGO while Sn2+ was oxidized to SnO2, uniformly depositing on the surface of rGO sheets. The composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), infrared spectra analysis (IR) and transmission electron microscopy (TEM), respectively, and their gas sensing properties were further investigated. Compared with pure SnO2 nanoparticles, the as-prepared SnO2erGO gas sensor showed much better gas sensing behavior in sensitivity and responseerecovery time to ethanol and H2S at low concentrations. Overall, the highly sensitive, quick-responding and low cost SnO2erGO gas sensor could be potentially applied in environmental monitoring area.

Key words: SnO2erGO, Gas sensor, Sensitivity, Responseerecovery time