Preparation of Nano Gas tungsten trioxide

Gas-phase method is the direct use of gas or gas by various means into the material, so that the gas generating physical change or chemical change in the conditions of action, the final form of nanoparticles after cooling. Its main process by sublimation, evaporation, decomposition, and make it a saturated steam, control crystallization process of amorphous thin films by appropriate conditions to obtain nano powder. The main method of gas-phase has chemical vapor deposition and physical vapor deposition. Chemical vapor deposition is mainly by the gas through the polycrystalline material into a single crystal, such as chemical transport fat, gas decomposition, and synthesis gas MOCVD method. The physical vapor through the vapor phase method is converted into a single crystal of polycrystalline material, such as sublimation - condensation method, molecular beam epitaxy and cathode sputtering. Fumed can be prepared from the liquid phase method is difficult to obtain the metal carbides, nitrides, borides and other non-oxide ultrafine. At the same time, compared to other methods, nano tungsten trioxide fumed output surface cleaner, clean and easy to control the particle size, the dispersibility of the particles is also good.

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