95% nano grain size violet tungsten oxide has the advantages of large specific surface area, large surface activity, and so on. The nano grain size violet tungsten oxide may be prepared by the following steps:
1. Weigh 0.01mol of ammonium metatungstate ((NH4)6H2W12O41), 0.24mol of ammonium nitrate (NH4NO3) and 0.05mol of thiourea (CN2H4S) in accordance with stoichiometry.
2. Dissolve these raw material powders in an appropriate amount of deionized water and stir until completely dissolved.
3. The above solution was heated at a constant temperature of 200°C to be evaporated to dryness and a vigorous redox reaction took place within several tens of seconds. At the same time, a large amount of gas exhausted and nano needle-shaped VTO powder generated with a diameter of 30~100 nm and a length of 0.5~5μm.
The above producing method has the following advantages:
1. Short and simple process, low cost, suitable for large-scale production;
2. The type and ratio of raw materials, the reaction process of precursor preparation, the morphology and crystal form of powder can all be controlled;
3. A large amount of gas was generated during the reaction, which hinders the full contact between reactants and oxygen, so that the reaction can be fully carried out.
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