Electrochromic material based on metal nanoparticle and electrochromic device

A technology of electrochromic materials and metal nanoparticles, which is applied in the direction of color-changing fluorescent materials, instruments, chemical instruments and methods, etc., can solve the problem that electrochromic materials are difficult to obtain color changes, electrolyte materials are complicated and costly, and electrochromic colors are single and other problems, to achieve the effect of improved color change, simplified preparation, and short response time

Active Publication Date: 2017-03-08
PEKING UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, electrochromic materials mainly gain and lose electrons through oxidation-reduction reactions, and the resulting new oxidation state or reduced state has a certain color change in the range of visible light. However, due to common organic, inorganic or organic-inorganic hybrid materials, electrochromic materials have limited Therefore, the same electrochromic material is difficult to obtain very rich color changes. However, the electrodeposition of metal silver ions can solve the problem of single color of common electrochromic. Silver nanoparticles are formed on the plate. Silver nanoparticles have a surface plasmon effect related to size and shape. Different color changes can be obtained by depositing the size of nanoparticles, but direct electrodeposition of metal silver ions is difficult to operate. Silver ions cannot exist stably in the electrolyte for a long time in the form of ions. In order to stabilize silver ions, a large amount of stabilizers need to be added, which causes the complexity of the entire electrolyte material and increases the cost. In order to solve the above problems, silver ions are directly prepared in ionic liquids. Nanoparticles or nanoparticles mixed with silver and other metals can greatly improve the stability of metallic silver, and can directly undergo different color changes through electrodeposition, without the need to form nano-silver grains on the plate in advance. Ionic liquids are new A generation of green solution, it has many advantages that general electrolytes do not have, such as negligible volatility, wide potential window and good conductivity, so the direct preparation of silver nanoparticles with surface charge in ionic liquid is a kind of A new potential electrochromic material

Method used

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  • Electrochromic material based on metal nanoparticle and electrochromic device
  • Electrochromic material based on metal nanoparticle and electrochromic device
  • Electrochromic material based on metal nanoparticle and electrochromic device

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1wt% silver acetate, 5mL acetone and 99wt% ionic liquid electrolyte 1-butyl-3-methylimidazolium bistrifluoromethanesulfonimide were rapidly stirred at room temperature to form a colorless mixed solution. Under rapid stirring, the acetone in the solution was removed under vacuum, and then H 2 As a reducing agent, silver acetate is reduced to silver nanoparticles. 0.01g of the mixed solution was injected into the device with ITO as the plate, sealed with a sealant and then tested.

[0037] Using a two-electrode system, two electrodes are added to both ends of the transparent electrode of the prepared electrochromic device, and a DC voltage of 2 V is applied to the device at intervals of 5 s with an interval of 30 s. As the power-on time increases, the device changes from the initial transparent state to yellow, red, ultraviolet and mirror states, see figure 2 . Apply reverse programming voltage to the device, and the device changes from mirror state to purple state, r...

Embodiment 2

[0039] 0.01wt% silver acetate, 5mL acetone and 89.99wt% ionic liquid electrolyte (tetrabutylammonium bistrifluoromethanesulfonimide) were stirred rapidly at room temperature to form a colorless mixed solution. Under rapid stirring, the acetone in the solution was removed under vacuum, and then H 2 Silver nitrate and palladium acetate were used as reducing agents to reduce gold and silver nanoparticles. Add 9.99wt% C6M and photoinitiator benzoin diethyl ether (IGR 651) accounting for 0.01wt% C6M addition in the synthesized gold and silver nanoparticles ionic liquid, inject 0.01g mixed solution into the device by ITO as pole plate In the test, it is sealed with a sealant and polymerized for 20 minutes under the intensity of a 365nm ultraviolet lamp of 2mW / cm2.

[0040] The testing method of the device is the same as that in Example 1. As the power-on time increases, the device changes from the initial transparent state to the yellow state, red state, ultraviolet state and mirr...

Embodiment 3

[0042] 1-methyl-3-(2-hydroxyethyl)imidazole bistrifluoromethanesulfonimide with 1 wt% mixed metal precursors (90 wt% silver acetate and 10 wt% palladium acetate) in 5 mL of acetone and 89.9 wt% ionic liquid electrolyte , stirred rapidly at room temperature to form a colorless mixed solution. Under rapid stirring, the acetone in the solution was removed under vacuum, and then H 2 Silver nitrate and palladium acetate are used as reducing agents to reduce silver palladium nanoparticles. Add 10 wt% glass microspheres with a diameter of 20 μm to the ionic liquid solution containing silver nanoparticles and mix evenly. 0.01g of the mixed solution was injected into the device with ITO as the plate, sealed with a sealant and then tested.

[0043] The testing method of the device is the same as that in Example 1. As the power-on time increases, the device changes from the initial transparent state to the yellow state, red state, ultraviolet state and mirror state, see Figure 4 . ...

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Abstract

The invention specifically relates to an electrochromic material based on a metal nanoparticle and an electrochromic device, belonging to the field of electrochromic materials and devices. The electrochromic material based on the metal nanoparticle comprises 0.01 to 1 wt% of the metal nanoparticle and 80 to 99 wt% of an ionic liquid electrolyte, wherein the metal nanoparticle is 100 wt% of metal nano-silver or a mixed nanoparticle of 10 to 90 wt% of metal silver and other metal. According to the invention, the silver nanoparticle is directly prepared in ionic liquid, the surface of the prepared nanoparticle is positively charged, and the ionic liquid is used both as a protective agent for the silver nanoparticle and as the electrolyte; so addition of needless stabilizing agent and electrolyte is avoided; thus, the preparation of the whole electrochromic material is greatly simplified, stability of metallic silver is improved, and the whole electrochromic performance is greatly improved. The electrochromic material and the electrochromic device are substantially innovative and have potential commercial advantages.

Description

technical field [0001] The invention relates to the field of electrochromic materials and devices, in particular to an electrochromic material and device based on metal nanoparticles. Background technique [0002] The research on electrochromism originated in the mid-1980s, and has attracted the attention of many scientific researchers. The biggest goal of the research is to simplify and commercialize it. Electrochromic devices are generally required to have the characteristics of bistable state, ignoring blind angle, high contrast, low manufacturing cost, wide operating temperature range, low driving voltage, and rich colors. They can be applied to electrochromic smart windows and automatic anti-glare automobiles. Rearview mirrors, electrochromic glasses, goggles, smart cards, smart labels, instrument displays, outdoor advertising and other fields. Therefore, the selection of electrochromic materials is particularly important. If a single electrochromic material can obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/00G02F1/15
CPCY02P20/54
Inventor 杨槐贺泽民苑晓王茜赵玉真李辰悦邹呈
Owner PEKING UNIV
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