Violet tungsten oxide nanoparticles for energy efficient glass can be prepared by a sputtering method, a microemulsion method, a chemical vapor deposition method, a hydrothermal synthesis method, a sol-gel method or a solvothermal method. Also, there are other synthesis methods for producing tungsten oxides.

Violet tungsten oxide nanoparticles for energy efficient building glass can be prepared by hydrothermal method. Some experts have used the hydrothermal method to prepare ultrafine W18O49 nanowires with a diameter of less than 1nm, namely violet tungsten oxide nanowires.

Violet tungsten oxide nanoparticles have unique photochromic properties - absorption of near infrared rays, shielding of ultraviolet rays, and transmission of visible light. Therefore, violet tungsten oxide nano powder has been more and more widely used in the production of transparent heat insulation glass coating for applying to building glass.

Studies have shown that violet tungsten oxide nanoparticles have good near-infrared absorption properties, and the absorption of infrared light of nano violet tungsten oxide can cover the entire near-infrared region, thus it can be used for preparing an environmentally-friendly transparent heat insulation coating.