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.

As a kind of multi-functional material, ultrafine W₁₈O₄₉ nanowire has high application value in many important fields, such as gas-sensing materials, sensors and photodetectors. It is usually prepared by solvothermal method, which is simple and environmentally friendly.

Ultrafine W₁₈O₄₉ nanowire is prepared by WCl₆ and triethylene glycol. During the preparation process, WCl₆ is used as precursor, and triethylene glycol is used as solvent. This is an efficient and environmentally friendly preparation method.

iolet tungsten oxide exhibits a strong, tunable localized surface plasmon resonance effect, which results in its light absorption in the near infrared region. Based on this light absorption property, photothermal conversion material of nano violet tungsten oxide is successfully prepared. It has application value in the treatment of cancer.

As violet tungsten oxide has high chemical activity and good air permeability, it is suitable for the production of ultrafine tungsten powder and tungsten carbide powder. At present, a kind of electric heating furnace is applied in the production of violet tungsten oxide.

The preparation of high-quality violet tungsten oxide has attracted more and more attention. In addition to improving the preparation process, upgrading the preparation device can also improve the quality of violet tungsten oxide effectively. Sealed multi-purpose furnace is suitable for the production of high-quality violet tungsten oxide.