Electrochromic Properties of β-V2O5 Film and Its Formation Using Vanadyl Alkoxoacetylacetonate

Abstract

A vanadium pentoxide film was obtained via dip-coating using vanadyl alkoxoacetylacetonate as a precursor. The material crystallizes in the tetragonal β-V₂O₅ modification and exhibits pronounced (200) texturing. It consists of one-dimensional structures with an aspect ratio of at least 10, some of which are consolidated into agglomerates where the particles are in contact along their long facets. According to Raman spectroscopy and the measured work function (4.63 eV) obtained by Kelvin probe force microscopy (KPFM), the oxide contains a noticeable amount of V⁴⁺ species. In terms of electrochromic behavior, the material exhibits anodic electrochromism, changing color to pale blue upon reduction and to a less transparent yellow-orange upon oxidation. The optical contrast reaches up to 27% in the blue region of the visible spectrum. These findings suggest that β-V₂O₅ materials synthesized using vanadyl alkoxoacetylacetonate are promising candidates for application in electrochromic devices.