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Flexible electrochromic film based on tungsten oxide, and preparation method and application of flexible electrochromic film

A tungsten oxide and chromic technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of poor adhesion between tungsten oxide film and substrate, insufficient performance of color-changing film, affecting electrochromic performance, etc., and achieve equipment cost. Inexpensive, highly bendable, low-cost effect

Inactive Publication Date: 2019-01-18
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dense tungsten oxide electrochromic films cannot fully perform due to defects such as low electron diffusion coefficient and long ion diffusion distance
At present, the methods for preparing tungsten oxide electrochromic thin films mainly include magnetron sputtering, electron beam evaporation, sol-gel, hydrothermal method, electrodeposition, etc., but the experimental conditions required for magnetron sputtering and electron beam evaporation are harsh. , expensive equipment, tungsten oxide films prepared by traditional chemical methods such as sol-gel and hydrothermal methods have poor adhesion to the substrate and are easy to fall off from the substrate, thus affecting the electrochromic performance
[0005] Chinese patent CN 105366954 A discloses a preparation method of nanometer tungsten oxide electrochromic film, which uses liquid phase laser ablation and electrophoretic deposition to prepare tungsten oxide film, but the required equipment is expensive and the steps are complicated
Chinese patent CN 104932169 A discloses a flexible electrochromic film, which is prepared by magnetron sputtering and pulling method 2 WO 4 ·H 2 O thin film, but the prepared tungsten oxide thin film is dense and has low porosity

Method used

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  • Flexible electrochromic film based on tungsten oxide, and preparation method and application of flexible electrochromic film
  • Flexible electrochromic film based on tungsten oxide, and preparation method and application of flexible electrochromic film
  • Flexible electrochromic film based on tungsten oxide, and preparation method and application of flexible electrochromic film

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preparation example Construction

[0030] The above-mentioned preparation method of the flexible electrochromic film based on tungsten oxide comprises the following steps:

[0031] (1) Flexible cleaning substrate: ultrasonically clean the flexible substrate in acetone, isopropanol, absolute ethanol, and deionized water in sequence, and then dry it naturally for use;

[0032] Among them, the flexible substrate is one of polyethylene terephthalate (PET), PI conductive film, silver-based transparent conductive film, and graphene-based transparent conductive film; the ultrasonic cleaning time is not less than 20 minutes;

[0033] (2) Spin-coating tungsten oxide precursor solution: dissolving the tungsten oxide precursor in absolute ethanol to prepare a tungsten oxide precursor solution, which is then spin-coated on the flexible substrate treated in step (1);

[0034] Among them, the tungsten oxide precursor is a mixture of one or more of tungsten hexachloride, tungsten pentachloride, tungsten tetrachloride, tungste...

Embodiment 1

[0043] In this embodiment, it is a flexible electrochromic film based on tungsten oxide, and its preparation method includes the following steps:

[0044] Step 1, substrate cleaning: ultrasonically clean the PET flexible substrate in acetone, isopropanol, absolute ethanol, and deionized water for 20 minutes to remove dust, organic matter and other stains on the surface, and then dry it naturally for use;

[0045] Step 2, spin-coating tungsten hexachloride precursor: Weigh 1.2g of tungsten hexachloride powder and dissolve it in 15mL of absolute ethanol, stir magnetically at 20°C for 20 minutes to obtain a tungsten oxide precursor, set the speed to 3000rpm, and the time to 30s. Spin-coat the tungsten oxide precursor on the PET flexible substrate;

[0046] Step 3, UV light deposition: transfer the PET flexible substrate obtained in step 2 to a UV light box with a wavelength of 185nm, and irradiate it for 3 minutes by means of ultraviolet light deposition, and repeat step 2 and st...

Embodiment 2

[0050] In this embodiment, it is a flexible electrochromic film based on tungsten oxide, and its preparation method includes the following steps:

[0051] Step 1, substrate cleaning: ultrasonically clean the PET flexible substrate in acetone, isopropanol, absolute ethanol, and deionized water for 30 minutes to remove dust, organic matter and other stains on the surface, and then dry it naturally for use;

[0052] Step 2, spin-coating tungsten hexachloride precursor: Weigh 2g of tungsten hexachloride powder and dissolve it in 20mL of absolute ethanol, stir magnetically at 30°C for 30min to obtain a tungsten oxide precursor, set the speed to 3500rpm, and the time to 45s. Spin-coat the tungsten oxide precursor on the PET flexible substrate;

[0053] Step 3, UV light deposition: transfer the PET flexible substrate obtained in step 2 to a UV light box with a wavelength of 254nm, and irradiate it for 3 minutes by means of ultraviolet light deposition, and repeat steps 2 and 3 altern...

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Abstract

The invention discloses a flexible electrochromic film based on tungsten oxide, and a preparation method and an application of the flexible electrochromic film. The flexible electrochromic film is made from amorphous tungsten oxide, has a loose and porous nano-morphology, and has the thickness of 200-400nm and the average pore diameter of about 100-300nm. The flexible electrochromic film has a loose and porous structure, so that the permeation and contact of an electrolyte are facilitated, and a path of charge transfer is shortened; and therefore, the flexible electrochromic film is good in electrochromic performance and wide in optical modulation range. The flexible electrochromic film based on the tungsten oxide has the characteristics of being flexible and bendable; and the flexible electrochromic film still has the electrochromic performance when being bent for more than 90 degrees. The preparation method is simple in preparation process, mild in reaction temperature and low in cost; and a possible preparation method is provided for industrial production of the tungsten oxide-based flexible electrochromic film.

Description

technical field [0001] The invention belongs to the field of flexible electrochromic films, in particular to a flexible electrochromic film based on tungsten oxide and its preparation method and application. Background technique [0002] Electrochromism (Eletrochromism) refers to the stable and reversible color change of the optical properties (reflectivity, transmittance, absorption rate, etc.) of the material through the injection or extraction of charges (ions or electrons) under the action of an external electric field. A phenomenon that manifests itself as a reversible change in color and transparency. Electrochromic devices can adjust to different levels of light transmittance under different voltages, and have bistable performance. After the state of color and transparency changes, it can be maintained for a long time without external voltage. Therefore, in smart windows , electronic paper, anti-glare mirrors and other green and energy-saving aspects have broad prosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/15G02F1/153G02F1/1523
CPCG02F1/15G02F1/1523G02F1/153
Inventor 魏昂田灿灿位威刘羽泽郑丽华
Owner NANJING UNIV OF POSTS & TELECOMM
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