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.
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In 2008, some experts used the electron irradiation method to prepare W18O49 nanowires. And the synthesized uniform W18O49 nanowires have a diameter of about 10nm and a length of about 100nm. In the experiment, a layered shell/core structure (PbWO4/WO3) was first prepared by hydrothermal method, and then concentrated by electron beam irradiation in a 300kV transmission electron microscope. Adopting the electron irradiation method, the monocrystalline W18O49 nanowires are directly grown on the TEM grid, which not only can be synthesized in a few seconds, but can ensure the performance of the monocrystalline nanowires. The W18O49 nanowires can grow rapidly within 30s, and the length of the nanowires depends on the irradiation time.
