Visible thermochromism in vanadium pentoxide coatings
Authors
S. Kumar, A. Qadir, F. Maury, and N. Bahlawane
Reference
ACS Applied Materials & Interfaces, vol. 9, no. 25, pp. 21447-21456, 2017
Description
Although di-vanadium pentoxide (V2O5) has been a candidate of extensive research for over half a century, its intrinsic thermochromism has not been reported so far. Films of V2O5 grown on silicon, glass and metal substrates by MOCVD in this study, exhibit a thermally induced perceptible color change from bright yellow to deep orange. Temperature-dependent UV-Vis spectroscopy and XRD allow the correlation between the reversible continuous red shift of the absorption and the anisotropic thermal expansion along the (001) direction, i.e. perpendicular to the sheets constituting the layered structure. Furthermore, the possibility of tuning the thermochromic behavior was demonstrated via a chemical doping with chromium.
