Synthesis of Tungsten Trioxide Hydrates

Details: Category: Tungsten Information; Published on Monday, 02 February 2015 17:39; Written by cq; Hits: 1498

The chemical and physical properties of metal oxides, including tungsten oxide, are generally dependent on the route of their synthesis. Knowledge of the relation between the synthesis conditions of specific metal oxide and its functional properties is important for the possible application of metal oxides in advanced technologies. Tungsten oxide and its hydrates can be synthesized using various chemical methods, such as ‘wet’ chemical precipitation, hydrolysis of tungsten alkoxide or thermal decomposition of tungsten salts. The WO3 films on various substrates can also be prepared using various vacuum techniques. Modification of the chemical or physical route within the same method also influences the resulting properties of the synthesized material.

Since the ‘wet’ chemical precipitation method is very sensitive to the physicochemical conditions of the precipitation, the experimental parameters in the chemical synthesis were thoroughly controlled. Tungsten trioxide hydrates were synthesized by cation exchange reaction from sodium tungstate solution and by acidification of the sodium tungstate solution. The cation exchange reaction generates a sodium and chloride free solution with a lot of possibilities for chemical and morphological modifications.

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