Nano Tungsten Trioxide Hydrothermal Method

The methods of Hydrothermal and Water Bath belong to the solution method for preparing tungsten trioxide (WO₃), it’s characterized by small experimental cost, low energy consumption, materials, degree of crystallinity and purity, which becomes the first choice for the preparation of WO₃.The application of modern nano materials science and technology enhances the performance of the material, or shows some unexpected properties. The preparation of nano tungsten trioxide is based on the hydrothermal method for the experimental approach, nano and tungsten trioxide materials.

The preparation of cubic monoclinic nano particulate WO₃, WO₃ • H₂Oand layered massive flower-like WO₃ • H₂O based on Na₂WO₄•2H₂O as raw materials, CTAB and oxalic acid supplement aids, by hydrothermal method and the preparation of the water bath method. After the sintering process,WO₃ • H₂O changes WO₃, and it keeps the original block and flower-like morphology. Three samples of the morphology of gas sensing tests show that the optimum operating temperature is 300 ℃, and flower-like structure shows the highest sensitivity, which shows the factors affecting the course of the reaction, mainly attributable to obtaining WO₃ • H₂O which is not easy to reunite and lay porous three-dimensional structure.

Research Indicates:
(1) Taking Na₂WO₄•2H₂O as raw materials, CTAB and oxalic acid supplement aids in favor of changing the reaction rate, the reaction time decreases from more than 24h shortened to less than 8h.
(2) Alkaline hydrothermal method is also capable of producing nanometer tungsten trioxide product, the need to expand the pH ranges from 3.5 to 8.9.
(3) The obtained nano-tungsten trioxide has a difficult reunion and layered porous, the average particle size of the particles is about 1μm.
(4) Tungsten trioxide as additives products has better dispersion, and WO₃ in gas sensing, electrochromic, chemical catalysis and electrochemical aspects show excellent performance.

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