Visible thermochromism in vanadium pentoxide coatings

Sunil Kumar (1) , Awais Qadir (1) , Francis Maury (2) , Naoufal Bahlawane (1)

1 LIST - Luxembourg Institute of Science and Technology
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

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 metal organic chemical vapor deposition in this study exhibit a thermally induced perceptible color change from bright yellow to deep orange. Temperature-dependent UV− vis spectroscopy and X-ray diffraction allow the correlation between the reversible continuous red shift of the absorption and the anisotropic thermal expansion along the (001) direction, that is, perpendicular to the sheets constituting the layered structure. Furthermore, the possibility of tuning the thermochromic behavior was demonstrated via a chemical doping with chromium

Mots clés: Reversible thermochromism; Di-vanadium pentoxide; MOCVD; Functional oxide; Smart coatings; Polycrystalline films; Temperature sensing; Anisotropic lattice expansion

Domaines: Matériaux

Sunil Kumar, Awais Qadir, Francis Maury, Naoufal Bahlawane. Visible thermochromism in vanadium pentoxide coatings. ACS Applied Materials & Interfaces, 2017, vol. 9 (n° 25), pp. 21447-21456. ⟨10.1021/acsami.7b04484⟩. ⟨hal-01651488⟩