There are various methods for the preparation of yellow tungsten oxide film such as sol-gel method, vacuum evaporation, anodic oxidation, spray pyrolysis, sputtering, laser ablation, pulsed laser deposition, and vacuum filtration and transfer, etc. But, why choose sol-gel method to prepare yellow tungsten oxide films?
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According to the experts, the sol–gel technique gained attention due to its simplicity and versatility. Moreover, this method is easy to scale up, and it allows for a precise control of the reactants’ concentration. Based on the results of the sol–gel methods, a good understanding exists of the effect of the preparation method and film microstructure on the electrochromic behavior of the WO3 films, in particular the kinetics and efficiency of the coloration and the electrochromic cycling stability. One of the more commonly utilized sol–gel methods is based on the reaction of the metallic tungsten with hydrogen peroxide that results in the formation of stable solutions of peroxopolytungstic acid, which contains the (W2O11)2? anion.
