Hydrothermal Synthesis of Tungsten Oxide Nanostructures

Tungsten oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals.Tungsten ores are treated with alkalis to produce WO3. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal.

Tungsten oxides inorganic semiconductor materials have received considerable attention in recent years because of their unique physico-chemical properties and widespread applications in various areas，such as electrochromic ( EC ) devices，gas sensors，photocatalytic systems，photoelectrochemical devices，and so on．Recently hydrothermal method has been exploited for the preparation of tungsten oxide micro / nanostructures with different sizes and shapes． Combining with our group' s work on the preparation of tungsten oxide micro /nanomaterials，the progress of preparation of tungsten oxide micro / nanomaterials by hydrothermal method is presented． The key influencing factors，such as the choice of reagents，the reaction time and temperature，are discussed in detail． The development trends of the tungsten oxide micro / nanomaterials fabricated by hydrothermal method are also proposed．

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