Nano yellow tungsten oxide is an important and common semiconductor, which has great application value in many fields. And therefore, it has attracted researchers' great interest. For example, yellow tungsten oxide may be used in the preparation of heat insulation coating. It is worth to note that hydrate yellow tungsten oxide (WO3•H2O) is also a semiconductor.
There are many processing methods for the production of various yellow tungsten oxide powders. These producing methods are chemical vapor deposition method, electrochemical deposition method, sol-gel method, thermal evaporation method, and hydrothermal method, etc. In these methods, the hydrothermal method can simply and effectively control the morphology and particle size of the WO3 product. By adding Rb2SO4, K2SO4, Na2SO4, Li2SO4 and (NH4)2SO4, yellow tungsten oxide with sea urchin-like, ribbon-like and cylindrical nanowires or nanorod structures can be prepared. And the results show that adding different types of sulfonates during preparation process can affect the morphology of the final product.
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