Effects of Interlayer Annealing Temperature on the Thermochromic Properties of VO₂/TiO₂ Thin Film

TiO₂ interlayer was deposited on the mica substrate,and the VO₂ film was fabricated on the TiO₂ interlayer under UV light irradiated. Video-based contact angle measuring device was used to analyze the hydrophilicity of the TiO₂ interlayer. XRD,FTIR and UV-vis were used to analyze the microstructure and the thermochromic properties of the VO₂/ TiO₂ composite films. The results suggest that the hydrophilicity of the TiO₂ film can be enhanced under ultraviolet excitation,and it is beneficial to coat V sol film uniformly on the TiO₂/ mica substrate. The VO₂/ TiO₂ composite films grow in a preferred orientation along the (011) direction under 510 ~ 560 ℃ of TiO₂ interlayer heat treating temperature. The transition temperature and hysteresis width of the composite films are reduced. The composite films grow in a preferred orientation along the (111) direction under 460 ℃ of annealing temperature for the TiO₂ interlayer,with more than 92% of shielding efficiency.