Tungsten trioxide film has nano-clusters, nano-trees or nanowire arrays. Among them, the tungsten trioxide nanometer array electrochromic film has the advantages of large spectral adjustment range, fast response speed and long cycle life. And such thin film can be prepared by the following method.
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A Preparation Method of WO3 Nano Array Electrochromic Film
Step one: dissolve white tungstic acid in aqueous hydrogen peroxide solution and add water to prepare a solution of peroxide tungstic acid containing 1-5mol/L of tungsten;
Step two: apply a solution of tungsten peroxide acid on the conductive surface of the clean conductive substrate to obtain a conductive substrate covered with the seed layer;
Step three: dissolve the tungsten salt in the alcohol to prepare a precursor solution, fixing the conductive substrate covered with the seed layer to the reaction kettle, adding the precursor solution to the reaction kettle, and reacting at 150-250°C for 8-16 hours. After taking out, carry out the heat treatment at 350-450°C for 1-3h.
Experts said that this kind of preparation process is convenient to control and low in manufacturing cost. Also, it can be produced on a large scale for realizing industrialization.
