Study of B/M phase transition and phase transition properties of annealing-tuned high phase transition latent heat of W-VO₂ nanorods

Vanadium dioxide (VO₂) can spontaneously regulate solar heat according to the ambient temperature, and has great application potential as a candidate for smart glass. However, its T_c, ΔT_c and ΔH cannot be coordinated at the same time, and commercial use is greatly hindered. W-doped VO₂ powders were prepared by the hydrothermal method under an argon atmosphere. Nanoflowers, nanorods, and other morphologies of W-doped VO₂ were characterized. The test results showed that W doping could reduce the T_c of VO₂ to 33.5 °C, ΔT_c < 10 °C, and with high ΔH (ΔH ≈ 36.98 J/g). The phase transition behavior and morphology change mechanism of W-doped VO₂ were investigated. The transformation of B and M phases was controlled by changing the annealing temperature, and W-VO₂(M) powders with good phase transition properties were finally produced to meet the requirements of the practical application of smart glass materials. © 2024 Elsevier Ltd.