Effect of PEG on the Morphology and NH3 Gas Sensing Properties of WO3 Nanostructures

Abstract

WO3 nanostructures were obtained by hydrothermal method using sodium tungstate dihydrate (Na2WO4•2H2O), hydrochloric acid(HCl). Polyethylene glycol (PEG-1000) was added in the initial precursors. The phase of WO3 nanostructures are characterized by X-ray diffraction (XRD). The morphology of WO3 are characterized by scanning electron microscopy (SEM). The morphology of WO3 was nanorods, however became nanoparticles with PEG-1000 adding. The effect of PEG on the formation of WO3 nanoparticles was studied. The NH3 gas sensing properties of WO3 nanostructures were also studied. The result showed that the sensitivity was increased with PEG -1000 adding.