W₁₈O₄₉ is a kind of non-stoichiometric tungsten oxide (WO_3-x). At present, the researches on the preparation of W₁₈O₄₉ at home and abroad mostly focus on the preparation methods of W₁₈O₄₉ nanowires and nanorods. W₁₈O₄₉ nanorod can be successfully prepared by sputtering method.

As an oxide of tungsten, W₁₈O₄₉ not only has fine visible light transmittance, but good near-infrared shielding ability. Therefore, it can be used to prepare heat insulation film for building window and automobile window.

W₁₈O₄₉/PDMS coated insulating glass can be widely used in the future. It not only has fine visible light transmission, but good near-infrared shielding ability. This kind of glass can modulate the solar energy intake effectively, so as to save energy to the greatest extent.

As glass coating of W₁₈O₄₉ can guarantee high visible light transmissivity and good thermal insulating property of the glass at the same time, it has high application value in architectural windows. This kind of glass coating can effectively control the energy exchange through the window.

With good light absorbing ability and thermal insulation performance, near infrared shielding material of W₁₈O₄₉ is widely used in the windows of modern buildings and automobiles. Its application is of great importance to energy saving and environmental protection.

Monoclinic W₁₈O₄₉ can be successfully prepared by the annealing of WO3 · H2O, which is synthesized by microwave irradiation, at the temperature of 600°C. This kind of preparation method can improve the production efficiency effectively. It is simple, time-saving and green.

W₁₈O₄₉ can be prepared by solid phase method. During the preparation process, WO₃ powder and urea at a mass ratio of 1:3 are heated in a tube furnace to prepare nanosphere W₁₈O₄₉ with hollow structure. This is an efficient preparation method with low cost.

Nano violet tungsten oxide with strong light absorbing ability can be used as photothermal conversion material. It has high application value in the treatment of cancer. As for its preparation, tungsten source and organic solvents are used as raw materials.

Nano violet tungsten oxide has strong absorbing ability of near-infrared light. Therefore, it can be used as a kind of photothermal conversion material. And it has high application value in cancer treatment.

Nano violet tungsten oxide (WO_2.72) with size less than 10 nm can be synthesized by alcoholysis and heat treatment. Compared with other forms, nano-sized violet tungsten oxide has better photocatalytic performance. It is a kind of photocatalysis material with high efficiency.