ELECTROCHROMIC PROPERTIES OF β-VO FILM AND ITS PREPARATION USING VANADYL ALKOXOACETYLACETONATE

Using alkoxoacetylacetonate vanadyl, a vanadium pentaxide film crystallized as a tetragonal β-VO modification was obtained by dip coating technique. The material is significantly textured along the axis (200) and is formed of one-dimensional structures with an aspect ratio of no less than 10, some of which are consolidated into agglomerates within which the particles are touching with long faces. According to the results of Raman spectroscopy and the value of electron work function for the film surface (4.63 eV), measured by KPFM, the oxide contains a noticeable amount of V. The obtained material, from the electrochromic properties point of view, is anodic, changing color during reduction to pale blue, and during oxidation — to less transparent yellow-orange. The optical contrast reaches 27% in the blue part of the visible spectrum. The results of the study allow us to conclude that β-VO-based materials obtained using alkoxoacetylacetonate vanadyl are promising for use as a component of electrochromic devices.