Microwave Hydrothermal Preparation of VO₂

As a thermal phase transitions material, VO₂ is famous for its phase transition performance. When the temperature is lower than the phase transition temperature, VO₂ behaves as a semiconductor with high infrared transmittance. When the temperature exceeds the phase transition temperature, VO₂ exhibits a metallic state and has a high refractive index for infrared. Regulation of phase transition temperature is key to the application of VO₂. In this paper microwave hydrothermal was used to prepare VO₂. H⁺ concentration, microwave power, annealing temperature and annealing time were used as variable conditions to find the best preparation conditions. The preparation of samples are studied by XRD, SEM and DSC. After comparative research, the optimum preparation process of vanadium dioxide by microwave hydrothermal method was found. In addition, by varying the acidic conditions and microwave power during the preparation process, the phase transition temperature of VO₂ can be regulated.

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