LOW-COST SYNTHESIS OF NOVEL VANADIUM DIOXIDE NANORODS

摘要

The synthesis of novel vanadium dioxide nanorods has been achieved by using V{sub}2O{sub}2 and cetyltrimethyl ammonium bromide (CTAB) in a sol-gel reaction followed by hydrother-mal treatment. Morphology and structure of the sample as well as vanadium oxidation state were characterized by XRD, SEM, HRTEM, ESR, XPS and redox titration. The results show that the products are monoclinic (C/2m) B phase VO{sub}2 nanorods and they are 1～2 μm in length. HRTEM micrographs reveal that they indeed form bundles of agglomerated smaller filaments with diameters ranging from 20 to 40 nm besides single nanorod, This filament-like shape in the nanoscale dimension leads to the exposure of a large fraction of the atoms to the surface. Thus, these materials are promising candidates for the development of new functionalized materials. CTAB not only generates a reducing atmosphere, but also plays a key role in the growth of the nanorods. The simplicity of hydrothermal process, as well as cheapness and availability of raw materials are advantages of this method.