Tungsten Trioxide Nano-Array Electrochrmic Thin Film Preparation

Electrochromic (EC) refers to the phenomenon that the optical properties of materials change reversibly under the action of an applied electric field. As an inorganic electrochromic material, tungsten trioxide (WO3) has been studied most fully. It has many advantages, such as pure color, stable chemical properties and strong adhesion to the substrate. However, traditional tungsten trioxide also has some disadvantages, such as slow transformation speed, low coloring efficiency, single color change and short cycle life.

In contrast, nanomaterials have many advantages that traditional materials do not have, such as large specific surface area, good conductivity, fast discoloration, good optical simulation, high coloring efficiency and good cycling performance. In recent years, many people are committed to nano tungsten oxide films. The most commonly used preparation methods are electrochemical deposition, hydrothermal method, magnetron sputtering and thermal evaporation deposition. There are some defects in these methods, such as the disordered and random nano-materials which make some electrochromic materials not fully and effectively utilized. Therefore, the preparation of regular arrays of tungsten oxide nano array films is very important.

The preparation method of tungsten trioxide nano array electrochromic film includes the following steps:

1)Dissolve scheelic acid in hydrogen peroxide solution and add water to prepare tungsten peroxide solution with tungsten concentration of 1-5 mol/L.

2)The tungstic peroxide solution in step 1 is coated on the conductive surface of the clean conductive substrate to obtain the conductive substrate covered with crystal seed layer.

3)Tungsten salt is dissolved in alcohol to form precursor solution. The conductive substrate covered with seed layer in step 2 is fixed in the reactor and precursor solution is added into the reactor. The reaction is carried out at 150 ℃ to 250 ℃ for 8 h to 16 h, and after heat removal at 350 ℃ to 450 ℃ for 1 h to 3 h to obtain a tungsten trioxide nano-array electrochromic film.

Tungsten trioxide nano-array electrochromic thin film with nano-clusters, nano-tree or nanowire array morphology, with large spectral adjustment range, high coloring efficiency, fast response, long cycle life, etc., can be used not only for electrochromism The field can also be used in sensitive devices, photocatalysis and photovoltaic fields, and has broad application prospects.

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