An electrochromic film for effectively modulating sunlight transmittance and its preparation method
An electrochromic and effective modulation technology, applied in coatings and other directions, can solve problems such as narrow band range and inability to realize independent regulation of near-infrared radiation heat, and achieve significant practical effects
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[0024] The present invention also provides a method for preparing an electrochromic thin film that effectively modulates sunlight transmittance, and the specific steps are as follows:
[0025] Step 1, preparing photosensitive tungsten oxide sol A and Cs-doped tungsten oxide photosensitive sol B;
[0026] Step 1.1, WCl 6 Mix with absolute ethanol at room temperature and stir for 2 hours to obtain a yellow tungsten oxide sol. Then, add a certain amount of 2,2-pyridine to the sol and reflux at 45-60°C for 2 hours to obtain photosensitive tungsten oxide sol. Tungsten sol A;
[0027] Step 1.2, adding a certain amount of CsCl to the photosensitive tungsten oxide sol A prepared in step 1.1, and stirring at 60° C. for 10 hours to obtain Cs-doped tungsten oxide photosensitive sol B;
[0028] In step 1, WCl 6 , absolute ethanol, 2,2-pyridine, and CsCl in a molar ratio of 1:30:1:(0.06~0.2);
[0029] Step 2, using spin coating technology to apply sol B on a transparent conductive coat...
Embodiment 1
[0039] An electrochromic film that effectively modulates sunlight transmittance is a Cs x WO 3A nano-lattice-embedded amorphous tungsten oxide composite film, wherein x=0.06, the nano-grid diameter is 80nm, the grid-dot spacing is 200nm, and the grid-dot height is 30nm.
[0040] The preparation method with the above structural parameters, the specific steps are as follows:
[0041] First, undoped tungsten oxide sol A and Cs-doped tungsten oxide sol B were respectively prepared. The process is as follows:
[0042] 4gWCl 6 Mix with 13.83g of absolute ethanol at room temperature, stir for 2 hours, then add 1.56g of 2,2-pyridine to the sol, and reflux at 45°C for 2 hours to obtain photosensitive tungsten oxide sol A.
[0043] Add 0.1 g of CsCl to photosensitive tungsten oxide sol A, and stir at 60° C. for 10 hours to obtain Cs-doped tungsten oxide photosensitive sol B.
[0044] Secondly, the sol B was coated on the transparent conductive coated glass substrate by spin coating...
Embodiment 2
[0050] An electrochromic film that effectively modulates sunlight transmittance is a Cs x WO 3 A nano-lattice-embedded amorphous tungsten oxide composite film, wherein x=0.2, the nano-grid diameter is 300nm, the grid-dot spacing is 600nm, and the grid-dot height is 80nm.
[0051] The preparation method with the above structural parameters, the specific steps are as follows:
[0052] First, undoped tungsten oxide sol A and Cs-doped tungsten oxide sol B were respectively prepared. The process is as follows:
[0053] 4gWCl 6 Mix with 13.83g of absolute ethanol at room temperature, stir for 2 hours, then add 1.56g of 2,2-pyridine to the sol, and reflux at 60°C for 2 hours to obtain photosensitive tungsten oxide sol A.
[0054] Add 0.34 g of CsCl to the photosensitive tungsten oxide sol A, and stir at 60° C. for 10 hours to obtain Cs-doped tungsten oxide photosensitive sol B.
[0055] Secondly, the sol B was coated on the transparent conductive coated glass substrate by spin c...
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