Investigations of Nonstoichiometric Tungsten Oxide Nanoparticles

摘要

Recently, pre phases of hollow multi-walled WS_2 nanotubes were prepared from a surface reaction with reduced tungsten oxide nanowhiskers. During the process , which stars with WO_(3-x) nanoparticles and finishes with WS_2 nanotubes, particular care has been devoted to the evolution of the tungsten oxide cores once the first encapsulating WS_2 layer has been formed. The reduced tungsten oxide phases were previously studied by a combination of techniques, including , high-resolution transmission electron microscopy and X-ray diffraction. In the present study, Raman spectroscopy combined with the previous two techniques is used to give further detalil concerning the structure of the reduction process of tungsten suboxide phases and the growth mechanism of oxide nanowhiskers and subsequency WS_2 nantubes from quasi-isotropic tungsten oxide nanoparticles