Abstract
The monodisperse hexagonal WO3 (h-WO3) nanowires were synthesized using hydrothermal treatment through the acidification of Na2WO4·2H2O by addition of K2SO4 and Na2SO4. The obtained products were characterized using X-ray powder diffraction, field emission scanning electron microscopy and transmission electron microscopy. It showed a high crystallinity and good dispersity of nanowire structure with the exposure of <200>crystal facets. Based on h-WO3 products, thin film sensors were prepared. The gas-sensing properties to various concentrations (10, 20, 50, 100, and 200ppm) of ethanol and formaldehyde were investigated. The h-WO3 nanowires exhibited high responses to both ethanol and formaldehyde gas. The sensor exhibited remarkably good response and fast response/recovery time, which were as short as 6–8s. A possible reason for the influence of oxide structure on the sensing properties of thin film sensors is proposed. This work shows great potential for the preparation of 1D h-WO3 nanostructures and their application in the detection of toxic gases.
Published Version
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