Microwave hydrothermal preparation of VO${}_2$

As a thermal phase transition material, VO${}_2$ is famous for its phase transition performance. When the temperature is lower than the phase transition temperature, VO${}_2$ behaves as a semiconductor with high infrared transmittance. When the temperature exceeds the phase transition temperature, VO${}_2$ exhibits a metallic state and has a high refractive index for infrared. Regulation of phase transition temperature is key to the application of VO${}_2$. In this article, microwave hydrothermal is used to prepare VO${}_2$. H${}^{+}$ concentration, microwave power, annealing temperature, and annealing time are used as variable conditions to find the best preparation conditions. The preparation of samples is studied by X-ray diffractometer, scanning electron microscope, and differential scanning calorimeter. After comparative research, the optimum preparation process of vanadium dioxide by microwave hydrothermal method is found. In addition, by varying the acidic conditions and microwave power during the preparation process, the phase transition temperature of VO${}_2$ can be regulated. (© 2023 Wiley‐VCH GmbH)