Synthesis and characterization of tungsten oxide nanostructures

Abstract

One-and two-dimensional tungsten oxide nanostructures were synthesized by solvothermal method using tungsten hexachloride(WCl6) as the precursor.The effects of the solvent and the concentration of WCl6 on the phase and the morphology of the as-synthesized tungsten oxide nanostructures were investigated and the NO2-sensing properties were evaluated.X-ray diffraction,field emission scanning electron microscope,transmission electron microscope,X-ray photoelectron spectroscopy were employed to characterize the as-synthesized products and the results indicate that the W18O49 nanorod,W18O49 nanowire and WO3 nanosheet with monoclinic structure can be formed by adjusting the solvent and WCl6 concentration.The NO2-sensing properties measurements show that the synthesized tungsten oxides have reversible response to NO2 at different concentrations.In comparison with WO3 nanosheet or W18O49 nanorod,the W18O49 nanowire exhibits much higher response to NO2 gas.