One-step hydrothermal synthesis of V1-xWxO2 (M/R) nanorods with superior doping efficiency and thermochromic properties

摘要

Pure phase V1-xWxO2(M/R) nanorods with superb metal-insulator transition properties were obtained in tungsten (W)-doped level ranges from 0.5 to 2.0 at% using a one-step hydrothermal treatment without additional annealing steps. The assured level of W doping greatly promotes the grain growth of pure phase vanadium oxide (VO2)(M/R) and simultaneously the phase transition temperature (T-c) is depressed as much as 103 degrees C per at% W for the V1-xWxO2 nanorods when x = 1.0-2.0 at%. After mixing the pure phase VO2(M) (W-doped 0.5 at%, phase transition at 47 degrees C) nanorods with acrylic resin, the integrated visible transmission of the VO2 composite coating on glass is up to 60.6% and the integrated solar modulation efficiency is up to 10.3%. These results mean that the superior thermochromic property will greatly favor the practical application of VO(2)(-)based smart windows.

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