Journal
TALANTA
Volume 132, Issue -, Pages 398-405Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2014.09.034
Keywords
Tungsten oxide (WO3); Reduced graphene oxide (RGO); Nanocomposite; Polyol; Metal organic decomposition (MOD); Room-temperature gas sensor
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Funding
- Ministry of Science and Technology of Taiwan [MOST 103-2113-M-034-001]
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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. (C) 2014 Elsevier B.V. All rights reserved.
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