Hydrothermal Synthesis of Nanodisperse V2O5 Using Oxalic Acid
Philipp Yu. Gorobtsov, T. L. Simonenko, Н. П. Симоненко, Е. П. Симоненко, V. G. Sevastyanov, Н. Т. Кузнецов
Abstract
Hydrothermal synthesis of V2O5 using ammonium vanadate and oxalic acid as the starting reactants was studied. The hydrothermal treatment of a solution at 200°C (6 h) gave a dark blue precipitate of vanadium dioxide consisting mainly of the monoclinic (B) phase. Further heat treatment at 350°C for 2 h resulted in vanadium dioxide oxidation to V2O5. The V2O5 particles thus obtained were 1–1.2 µm-long nanorods of 10–20 nm in diameter. The obtained powder was used to form a coating on an aluminum substrate. The distribution of local electrophysical properties over the surface of V2O5 particles was studied using scanning Kelvin probe microscopy and scanning capacitance microscopy.