Tungsten Oxide (WO3) Nanopowder Prepared by Pyrolysing Method

The invention relates to nanoscale tungsten oxide (WO3) powder and a pyrolysing preparation method thereof, wherein an optimized raw material composition consisting of ammonium paratungstate (APT), citric acid and ammonia in corresponding proportion is adopted, the molar ratio of APT and citric acid is 1.5, and parameters of a preparation process matched are used. The flow of oxygen based on per gram of precursor is 55ml/min, and the thermal treatment temperature is 520 DEG C, so that WO3 nanopowder with uniformly distributed grain size is obtained.

A pyrolysis Method tungsten oxide (WO3) nano powder, characterized in that: prepared by the following steps:

First, the selection of particle size of about 5μπι purity ammonium paratungstate (APT) as a reaction raw material, distilled water was added to the reaction vessel , and the mixture was stirred using a magnetic stirrer, a solution of citric acid was added with stirring;
Secondly, waiting citric acid solution evenly dissolved and mixed, while stirring, high-purity ammonium paratungstate (APT) to the reaction vessel;

Third, high dried Fourth, the reaction solution was placed in the evaporation vessel was concentrated and concentrated to give a concentrated solution in the drying apparatus at 150-160 ° C under;

Fourth,pure after addition of aqueous ammonia, ammonium paratungstate (APT) addition was complete, the reaction solution was stirred to obtain a uniform to obtain a precursor;

Fifth, the precursors were pulverized in a milling device, and then placed in a crucible of oxygen through the heat treatment is performed to give the final tungsten oxide (WO3) nanopowder; wherein said high purity ammonium paratungstate (APT) purity greater than 99.9wt%, the amount of citric acid was added to a solution of ammonium paratungstate (APT) and the calculated molar ratio of citric acid to 3; the ammonia concentration of 30%; the stirring speed was 180-200r/min; When the heat treatment, the precursor calculated per g of oxygen flow 50_60ml/min, a temperature of 500-520 ° C, time is 1.2-1.5h0.




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