Low-Valent Vanadium Oxide Nanostructures with Controlled Crystal Structures and Morphologies

Abstract

Low-valent vanadium oxide nanostructures have been synthesized in large quantities using commercial V2O5 powder as the precursor by a facile reduction method. The crystal structures and morphologies of vanadium oxide nanostructures can be adjusted by altering the concentrations and types of reductants. VO2(B) nanostructures are fabricated using oxalic acid as the reductant. VO2(B) nanobelts with widths of 80-150 nm, thicknesses of 20-30 nm, and lengths up to several micrometers can evolve to olive-like nanostructures composed of nanosheets with thicknesses of several nanometers and lateral dimensions of several micrometers as the concentration of oxalic acid increases. H2V3O8 nanobelts with widths of 200-300 nm, thicknesses of 10-20 nm, and lengths up to several 10s of micrometers are obtained under the reduction of V2O5 powder with ethanol. The belt-shaped morphologies of H2V3O8 are not affected by the concentration of ethanol.

Formation of vanadium oxides with various morphologies by chemical vapor deposition

“…Low-dimensional V 2 O 5 , such as nanotubes [4,7], nanowires [8], nanoribbons [1] and nanourchins [2], have been synthesized by thermal evaporation and hydrothermal treatment. In addition, low-valent vanadium oxide (VO 2 ) nanostructures have been synthesized by Li et al [9].…”

Reactions of organo-rhodium complexes with multidentate N,N and N,S-heterocycles and exchange studies by NMR

“…Because of in situ formation of carbonate ion by the reaction between acetate ion and hydroxide ion, the CdCO 3 nanowires formed when the reactants achieved supersaturation. This preparation method is different from the previous reports made for the preparation of other 1D material such as, TiO 2 nanofibres, VO 2 nanobelts and CdCO 3 nanobelts [10,32,33]. The influence of water quantity in water-alcohol mixture on the growth of CdCO 3 nanowires is another important parameter.…”

Preparation of VO2(B) Nanoflake with Glycerol as Reductant Agent and its Catalytic Application in the Aerobic Oxidation of Benzene to Phenol

“…They found that VO 2 (B) could transform to rutile VO 2 by heating VO 2 (B) in argon, and to corundum V 2 O 3 by reducing in 5% H 2 : 95% N 2 . Li et al [24] fabricated VO 2 (B) nanobelts with the widths of 80-150 nm and the thicknesses of 20-30 nm by reducing V 2 O 5 with oxalic acid under hydrothermal conditions [20]. Liu et al fabricated 3D hollow VO 2 (B) micro-spheres by reacting V 2 O 5 with aniline and glucose.…”