Preparation Method of Nanocrystalline Reinforced Tungsten Oxide Electrochromic Film

Tungsten oxide electrochromic film has great application value in the field of building energy-saving glass due to its real-time adjustment of indoor lighting and thermal insulation. It is considered as the next generation energy-saving window material to take over Low-e coated glass.

The tungsten oxide electrochromic glass window is mainly composed of a transparent electrode, a tungsten oxide electrochromic film, a lithium ion electrolyte, an ion storage film, a transparent electrode, and the like, and a low voltage power supply is provided to provide a driving voltage to realize the electricity of the sandwich structure.

However, the existing tungsten oxide electrochromic glazing has the disadvantages of short cycle life, slow response rate of large-sized glass electrochromic and lack of near-infrared modulation capability, which affects the wide use of the material in the field of building energy-saving glass. The key material that affects the electrochromic performance of the window is the tungsten oxide electrochromic film. Therefore, in order to prepare the electrochromic material, the cycle life of the electrochromic material is long, the color change response rate of the large-sized material is fast, and the tungsten oxide electrochromism with near-infrared modulation capability is prepared. Some scholars have proposed a nanocrystalline reinforced tungsten oxide electrochromic film preparation method, which is based on amorphous tungsten oxide as a matrix, the nanocrystalline transparent conductive oxide (TCO) is embedded in the matrix, The prepared "TCO nanocrystalline-WO₃ amorphous" dual phase composite film. The specific steps of the tungsten oxide film in the near-infrared band modulation are as follows:

Step 1, The tungsten chloride and TCO are mixed with metal nitrate, dissolved in an organic solvent to obtain a mixed solution; deionized water is added thereto, stirred at room temperature for 2 hours, and fully dissolved to obtain a composite sol;

Step 2, Using the immersion pulling or spin coating technique, the composite sol obtained in the step 1 is uniformly coated on the transparent conductive oxide glass substrate to form a gel film;

Step 3, The gel film obtained in step 2 is placed in a 150 ° C environment for 10 min, placed in a heat treatment furnace and incubated in an oxygen atmosphere at 200 to 300 ° C for 1 hour, and then taken out, air cooled to room temperature, that is, electro-induced Color changing film.

The process adopts nano-crystal enhancement technology to improve the electrochromic performance of the traditional tungsten oxide film in the visible light range. At the same time, the modulation characteristics of the TCO nanocrystal in the near-infrared region are used to realize the modulation of the tungsten oxide film in the near-infrared band, thus solving the existing in the technology, the tungsten oxide film has a long cycle life, a large electro-chromic response rate of a large-sized material, and a lack of near-infrared modulation capability.

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