Facile Solvothermal Synthesis and Gas Sensitivity of Graphene/WO3 Nanocomposites

Materials

Yanghai Gui²  Junhua Yuan¹  Weiming Wang²  Jianbo Zhao²  Junfeng Tian² 

[1]College of Life Sciences and Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China

[2] E-Mail:

[3]Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, China

[4] E-Mails:

关键词: WO₃;    graphene/WO₃;    solvothermal;    gas sensor;   

DOI  :  10.3390/ma7064587

来源: mdpi

【 摘 要 】

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 NO_x.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.