Violet tungsten oxide nanoparticles for heat-insulating energy-saving glass can be prepared by a microemulsion method, a chemical vapor deposition method, a hydrothermal method or a solvothermal method. Although there are many preparation methods of nano violet tungsten oxide, the micro-emulsion method and the chemical vapor deposition method all have higher requirements on the reaction conditions. And the synthesis is difficult, the cost is high, and the product controllability is poor.
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While the hydrothermal method has been widely concerned due to its simple preparation method and strong operability. At the same time, the requirements for the reaction conditions are low, and the obtained product has good dispersibility and uniform particle size. However, as far as the choice of the tungsten source in the reaction precursor is concerned, the tungsten ion cannot be stably present in water, and the solvothermal method can avoid the disadvantage of the tungsten source because the organic solvent is selected as the solvent in the precursor. Therefore, the solvothermal method is one of the best methods for preparing tungsten-based oxides such as nano particle size violet tungsten oxide.
