Junfeng Peng

Cost-saving synthesis of vanadium oxide nanotubes

Abstract The synthesis of vanadium oxide nanotubes has been achieved by using V 2 O 5 as vanadium oxide precursor. Due to its low cost, high yield and ease of handling, the synthesis starting from V 2 O 5 provides an advantageous access to large quantity of the tubular vanadium oxide nanotubes.

Raman spectroscopic study of vanadium oxide nanotubes

Abstract Raman-scattering measurements have been used to study the microstructure of vanadium oxide nanotubes (VO x -NTs). The Raman spectra of VO x -NTs reflect the various (group) vibrations of V–O type and lattice vibration of the layered structure as well as organic group vibration of the residual organic template. Moreover, it is confirmed that the residual organic template can be removed by irradiation of laser under the preservation of the tubular morphology, which provides the possibility for favoring the scaling-up of removing the residual organic template in the structure of VO x -NTs.

LOW-COST SYNTHESIS OF NOVEL VANADIUM DIOXIDE NANORODS

The synthesis of novel vanadium dioxide nanorods has been achieved by using V2O5 and cetyltrimethyl ammonium bromide (CTAB) in a sol–gel reaction followed by hydrothermal 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 VO2 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.

Self-Assembling Synthesis of Vanadium Oxide Nanotube Incorporating Organic Molecules

Vanadium oxide nanotubes were prepared by hydrothermal self-assem bling process from vanadium pentoxide and organic molecules as structure-directing templa s. The morphology and structure of the nanotubes were characterized by XRD, SEM, TEM, F TIR and ESR techniques. The results confirm the presence of vanadium (IV) which plays an im portant role in the formation of curved interface during preparing vanadium oxide nanotubes.