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Selective light absorption-electrochromic film, preparation method thereof and selective light absorption-electrochromic device

An electrochromic device and electrochromic film technology, applied in optical components, nonlinear optics, instruments, etc., can solve problems such as power consumption, reduction, and insufficient cooling effect, and achieve the purpose of reducing indoor temperature and reducing injection. Effect

Active Publication Date: 2020-09-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The British "Materials Horizon" reported a tungsten oxide electrochromic window, which can achieve different degrees of discoloration by applying different voltages, so that it has bright full-spectrum transmission, reduces the cool of near-infrared transmission and reduces the full-spectrum transmission. The dark three control modes, but the spectrum shows that this change is mainly in the 1360-2000nm band, and through the analysis of the solar radiation spectrum, it can be seen that the near-infrared band (47%) that carries nearly half of the solar energy is mainly concentrated In the range of 760-1360nm (36%), so this so-called cool mode, the effect of reducing near-infrared light radiation and cooling the actual indoor temperature is not obvious enough, but will generate additional power consumption
In addition, when the voltage is further increased, the transmittance of the window to visible light will be significantly reduced, and the basic transmittance function of the window will be lost, and additional energy consumption will be generated in indoor lighting.

Method used

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  • Selective light absorption-electrochromic film, preparation method thereof and selective light absorption-electrochromic device
  • Selective light absorption-electrochromic film, preparation method thereof and selective light absorption-electrochromic device
  • Selective light absorption-electrochromic film, preparation method thereof and selective light absorption-electrochromic device

Examples

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preparation example Construction

[0058] The present invention also provides a method for preparing a selective light absorption-electrochromic film, comprising the following steps:

[0059] a) providing a first dispersion liquid containing silver nanowires, tungsten oxide nanowires and a solvent;

[0060] b) Co-assemble the first dispersion on a transparent substrate by the Langmuir-Burgett method to form a first nanomaterial layer constructed of silver nanowires and tungsten oxide nanowires, the silver nanowires The wires and tungsten oxide nanowires are arranged in an orderly manner in the first nanomaterial layer; the co-assembly is repeated several times, and the angle of the substrate is rotated once after each co-assembly is completed, and finally a layer of the first nanomaterial is formed on the substrate. The first nanomaterial film formed by stacking layers;

[0061] c) providing a second dispersion, which contains gold nanorods, tungsten oxide nanowires and a solvent;

[0062] d) co-assembling th...

Embodiment 1

[0080] Take 0.5mL of silver nanowire solution with a concentration of 0.0084g / mL and centrifuge it at 2500rpm for 3 minutes, then disperse it into 0.5mL of N,N-dimethylformamide, and then take 1mL of tungsten oxide nanowire solution with a concentration of 0.004g / mL. The wire solution was centrifuged at 8000rpm for 5 minutes and added to the above-mentioned N,N-dimethylformamide to disperse evenly; then 0.5mL chloroform was added to the above nanowire solution and mixed evenly to obtain nanowires containing silver nanowires and tungsten oxide nanowires. line dispersion.

[0081] The above dispersion was co-assembled on a PC substrate with a thickness of 0.125 mm by the Langmuir-Bougett method to form a nanomaterial layer constructed of silver nanowires and tungsten oxide nanowires; the co-assembly was repeated 4 times After each co-assembly is completed, the substrate is rotated clockwise by 90°, and finally a flexible conductive-electrochromic film layer stacked by multiple n...

Embodiment 2

[0086] Change the mixed type of gold nanorods of different sizes in Example 1, take 0.50 mL of each gold nanorod solution with a size of 111×20nm and 101×15nm, and keep the other preparation conditions consistent with Example 1 to prepare selective light absorption- Electrochromic film products.

[0087] Use a scanning electron microscope to characterize the structure of the selective light absorption-electrochromic film prepared in this example, the results are as follows Figure 9 as shown, Figure 9 It is the SEM characterization diagram of the selective light absorption-electrochromic film product provided in Example 2 of the present invention. pass Figure 9 It can be seen that the gold nanorods of different sizes in the article are attached to the tungsten oxide nanowires arranged in parallel, arranged along the orientation of the tungsten oxide nanowires, and do not require additional functional groups (such as mercapto groups) to connect.

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Abstract

The invention belongs to the field of nano material assembly, and particularly relates to a selective light absorption-electrochromic film, a preparation method thereof and a selective light absorption-electrochromic device. The selective light absorption-electrochromic film provided by the invention comprises a transparent substrate, a first nano material film and a second nano material film which are in contact in sequence; the first nano material film is of a multi-layer structure formed by assembling silver nanowires and tungsten oxide nanowires for multiple times, wherein the silver nanowires and the tungsten oxide nanowires in each layer are arranged in order, and the arrangement directions of every two adjacent layers are different; and the second nano material film is of a multi-layer structure formed by assembling gold nanorods and tungsten oxide nanowires for multiple times, wherein the gold nanorods and the tungsten oxide nanowires in each layer are arranged in order, and the arrangement directions of every two adjacent layers are different. The film material provided by the invention has more excellent selective light absorption and electrochromic properties, and the preparation process is simple and easy for large-scale mass production.

Description

technical field [0001] The invention belongs to the field of nanometer material assembly, and in particular relates to a selective light absorption-electrochromic film, a preparation method thereof and a selective light absorption-electrochromic device. Background technique [0002] Due to the aggravation of the greenhouse effect, the time of high temperature is getting longer and longer each year, which leads to higher and higher energy consumption of people using air conditioners. The proposal of electrochromic smart windows provides a new solution for reducing energy consumption. , By applying a certain voltage, the transmittance of the window to the incident light changes, thereby effectively reducing the radiation of sunlight to the room and reducing the energy consumption of refrigeration equipment such as air conditioners. [0003] The British "Materials Horizon" reported a tungsten oxide electrochromic window, which can achieve different degrees of discoloration by a...

Claims

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Application Information

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IPC IPC(8): G02F1/157G02B5/00G02B5/23G02B5/20E06B9/24
CPCE06B9/24E06B2009/2464G02B5/008G02B5/208G02B5/23G02F1/157
Inventor 刘建伟盛思哲
Owner UNIV OF SCI & TECH OF CHINA
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