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Facile Solvothermal Synthesis and Gas Sensitivity of Graphene/WO3 Nanocomposites

Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, China
College of Life Sciences and Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
Author to whom correspondence should be addressed.
Materials 2014, 7(6), 4587-4600;
Received: 1 May 2014 / Revised: 9 June 2014 / Accepted: 9 June 2014 / Published: 17 June 2014
(This article belongs to the Section Advanced Composites)
Graphene has attracted enormous attention owing to its extraordinary properties, while graphene-based nanocomposites hold promise for many applications. In this paper, we present a two-step exploitation method for preparation of graphene oxides and a facile solvothermal route for preparation of few-layer graphene nanosheets and graphene/WO3 nanocomposites in an ethanol-distilled water medium. The as-synthesized samples were characterized by using field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible (UV-vis) spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), thermogravimetric-differential thermal analysis (TG-DTA) and gas-sensing test. The resistivity of the thick-film gas sensors based on sandwich-like graphene/WO3 nanocomposites can be controlled by varying the amount of graphene in the composites. Graphene/WO3 nanocomposites with graphene content higher than 1% show fast response, high selectivity and fine sensitivity to NOx. View Full-Text
Keywords: WO3; graphene/WO3; solvothermal; gas sensor WO3; graphene/WO3; solvothermal; gas sensor
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MDPI and ACS Style

Gui, Y.; Yuan, J.; Wang, W.; Zhao, J.; Tian, J.; Xie, B. Facile Solvothermal Synthesis and Gas Sensitivity of Graphene/WO3 Nanocomposites. Materials 2014, 7, 4587-4600.

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