title: Fabrication and NO2 gas-sensing properties of reduced graphene oxide/WO3 nanocomposite films.
abstract: One-pot polyol process was combined with the metal organic decomposition (MOD) method to fabricate a room-temperature NO2 gas sensor based on tungsten oxide and reduced graphene oxide (RGO/WO3) nanocomposite films. Fourier Transform infrared spectrometer (FTIR), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to analyze the microstructure and morphology of the fabricated films. The electrical and NO2 gas-sensing properties of WO3 to which various amounts of RGO were added were measured in detail as a function of concentration of NO2 gas at room temperature, to elucidate the contribution of RGO to the NO2 gas-sensing capacity. The NO2 gas-sensing mechanism of the RGO/WO3 nanocomposite films were explained by considering their composition and microstructures. The sensor that was based on a nanocomposite film of RGO/WO3 exhibited a strong response to low concentrations of NO2 gas at room temperature, satisfactory linearity and favorable long-term stability.
authors.affiliation: Department of Chemistry, Chinese Culture University, Taipei 111, Taiwan. Electronic address: spg@faculty.pccu.edu.tw.
authors.forename: Pi-Guey
authors.initials: PG
authors.lastname: Su
authors.affiliation: Department of Chemistry, Chinese Culture University, Taipei 111, Taiwan.
authors.forename: Shih-Liang
authors.initials: SL
authors.lastname: Peng
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation; D006108:Graphite / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D009585:Nitrogen Dioxide / Q000032:analysis*; D010087:Oxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014414:Tungsten / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D010087:Oxides; D006108:Graphite; C511604:tungsten oxide; D009585:Nitrogen Dioxide; D014414:Tungsten
keywords: Metal organic decomposition (MOD); Nanocomposite; Polyol; Reduced graphene oxide (RGO); Room-temperature gas sensor; Tungsten oxide (WO(3))