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Tungsten trioxide nanometer array electrochromic film and preparation method thereof

A nano-array and electrochromic technology, applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology, etc., can solve the problems of poor structural connectivity, slow transition speed, short cycle life, etc., and achieve low manufacturing cost, fast response speed, The effect of long cycle life

Active Publication Date: 2015-06-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technical scheme can prepare ordered tungsten trioxide nanorods, the structural connectivity between each tungsten trioxide nanorods is poor, and there are still shortcomings such as slow transformation speed, low coloring efficiency and short cycle life.

Method used

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  • Tungsten trioxide nanometer array electrochromic film and preparation method thereof
  • Tungsten trioxide nanometer array electrochromic film and preparation method thereof
  • Tungsten trioxide nanometer array electrochromic film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1) Clean the FTO conductive glass (Shenzhen Disprey Photoelectric Material Co., Ltd., Rs≤10ohm, Tr>85%) with acetone, deionized water and ethanol for 10 minutes, and blow it with nitrogen to get a clean FTO conductive glass;

[0043] 2) Drop excess concentrated hydrochloric acid (10mol / L) into 1mol / L sodium tungstate aqueous solution until no new precipitates are formed, wash the precipitates with deionized water, and the milky white to pale yellow colloidal precipitates obtained after washing are White tungstic acid, the obtained white tungstic acid is dissolved in an aqueous hydrogen peroxide solution with a mass percentage of hydrogen peroxide of 30%, the molar ratio of white tungstic acid to hydrogen peroxide in an aqueous hydrogen peroxide solution is 1:3, and deionized Water is prepared into peroxide tungstic acid solution containing tungsten at a concentration of 3mol / L, and refrigerated at 4°C for later use;

[0044] 3) Spin-coat the peroxide tungstic acid solu...

Embodiment 2

[0053] 1) Clean the FTO conductive glass (Shenzhen Disprey Photoelectric Material Co., Ltd., Rs≤10ohm, Tr>85%) with acetone, deionized water and ethanol for 10 minutes, and blow it with nitrogen to get a clean FTO conductive glass;

[0054] 2) Drop excess concentrated hydrochloric acid (10mol / L) into 1mol / L sodium tungstate aqueous solution until no new precipitates are formed, wash the precipitates with deionized water, and the milky white to pale yellow colloidal precipitates obtained after washing are White tungstic acid, the obtained white tungstic acid is dissolved in an aqueous hydrogen peroxide solution with a mass percentage of hydrogen peroxide of 30%, the molar ratio of white tungstic acid to hydrogen peroxide in an aqueous hydrogen peroxide solution is 1:3, and deionized Water is prepared into peroxide tungstic acid solution containing tungsten at a concentration of 3mol / L, and refrigerated at 4°C for later use;

[0055] 3) Spin-coat the peroxide tungstic acid solu...

Embodiment 3

[0064] 1) Clean the FTO conductive glass (Shenzhen Disprey Photoelectric Material Co., Ltd., Rs≤10ohm, Tr>85%) with acetone, deionized water and ethanol for 10 minutes, and blow it with nitrogen to get a clean FTO conductive glass;

[0065] 2) Drop excess concentrated hydrochloric acid (10mol / L) into 1mol / L sodium tungstate aqueous solution until no new precipitates are formed, wash the precipitates with deionized water, and the milky white to pale yellow colloidal precipitates obtained after washing are White tungstic acid, the obtained white tungstic acid is dissolved in an aqueous hydrogen peroxide solution with a mass percentage of hydrogen peroxide of 30%, the molar ratio of white tungstic acid to hydrogen peroxide in an aqueous hydrogen peroxide solution is 1:3, and deionized Water is prepared into peroxide tungstic acid solution containing tungsten at a concentration of 3mol / L, and refrigerated at 4°C for later use;

[0066] 3) Spin-coat the peroxide tungstic acid solu...

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Abstract

The invention discloses a tungsten trioxide nanometer array electrochromic film and a preparation method thereof. The preparation method comprises the following steps of: dissolving white tungstic acid into an aqueous hydrogen peroxide solution; preparing into a tungstic acid peroxide solution with the tungstenic concentration of 1-5 mol / L by adding water; coating the tungstic acid peroxide solution on the conductive surface of a clean conductive substrate to obtain a conductive substrate covered with a seed crystal layer; dissolving tungstate into alcohol to form a precursor solution; fixing the conductive substrate covered with the seed crystal layer into a reaction kettle, adding the precursor solution to the reaction kettle, and reacting at 150-250 DEG C for 8-16 hours; and taking out, and then carrying out heat treatment at 350-450 DEG C for 1-3 hours. The tungsten trioxide nanometer array electrochromic film prepared through the method has the advantages of nanocluster, nanometer tree or nanowire array pattern, good electric connection, large spectrum regulation range, high response speed and long cycle life; the preparation process disclosed by the invention has the advantages of convenience for control, lower preparation cost, large-area production and easiness for industrialization.

Description

technical field [0001] The invention relates to the field of film materials and preparation thereof, in particular to a tungsten trioxide nano-array electrochromic film and a preparation method thereof. Background technique [0002] Electrochromics (EC) refers to the phenomenon that the optical properties of materials undergo reversible changes under the action of an applied electric field. Electrochromism only needs a voltage of about 2V to work, and the original coloring or fading state can be kept unchanged in the open circuit state, so the energy consumption is very little. Electrochromic devices are expected to be used in building energy-saving windows, automotive anti-glare rearview mirrors, display equipment, variable transmittance glasses, automotive sunroofs, and surface temperature control of spacecraft. Electrochromic materials are mainly divided into three types, namely inorganic electrochromic materials (generally transition metal oxides), organic single-molecu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B82Y40/00
Inventor 王秀丽蔡国发周鼎谷长栋涂江平
Owner ZHEJIANG UNIV
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