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Preparation method for tungsten trioxide nanowire electrochromic film

A technology of tungsten trioxide and rice noodle electricity, applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology, coating, etc., can solve problems such as hindering practical application, low coloring efficiency, slow discoloration speed, etc., and achieve controllable hydrothermal process. , Improve the adhesion performance, the effect of fast discoloration

Inactive Publication Date: 2017-09-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Tungsten trioxide (WO 3 ) is a well-researched electrochromic material, which has stable chemical properties and good aesthetic effect of color change. its practical application
This method uses very expensive tungsten sources such as tungsten hexacarbonyl, and easily corroded WO 3 The sulfuric acid of the film is used as the electrochromic electrolyte, and the maximum optical contrast change before and after coloring does not exceed 70%. If it is used as an electrochromic smart window, the absorption effect on sunlight is poor, which is not conducive to energy saving and heat insulation functions play

Method used

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  • Preparation method for tungsten trioxide nanowire electrochromic film
  • Preparation method for tungsten trioxide nanowire electrochromic film
  • Preparation method for tungsten trioxide nanowire electrochromic film

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Clean the FTO conductive glass sequentially with acetone, ethanol, and deionized water ultrasonically, each cleaning time is 20 minutes, and dry it for later use;

[0038] (2) Weigh 0.25g tungstic acid and dissolve it in 15mL hydrogen peroxide solution with a mass fraction of 30%, then add 50mL deionized water, continue stirring for 8h, after forming a preliminary sol, continue aging for 24h to obtain tungsten acid sol, and then the tungstic acid sol was spin-coated on the FTO conductive glass at a rate of 3000rpm, and the spin-coating time was 20s, and then the FTO conductive glass was annealed at 400°C for 40min to obtain a 3FTO conductive glass of the seed layer;

[0039] (3) Weigh 1.32g of sodium tungstate dihydrate and dissolve it in 18mL of deionized water, add 2.5mL of 3mol / L hydrochloric acid solution to adjust the pH value to about 2, then add 1.056g of ammonium sulfate and 12mL of ethylene glycol, and continue stirring for 30min. Obtain a stable tungsten ...

Embodiment 2

[0051] (1) Clean the FTO conductive glass sequentially with acetone, ethanol, and deionized water ultrasonically, each cleaning time is 20 minutes, and dry it for later use;

[0052] (2) Weigh 0.25g tungstic acid and dissolve it in 15mL hydrogen peroxide solution with a mass fraction of 30%, then add 50mL deionized water, continue stirring for 8h, after forming a preliminary sol, continue aging for 24h to obtain tungsten acid sol, and then the tungstic acid sol was spin-coated on the FTO conductive glass at a rate of 3000rpm, and the spin-coating time was 20s, and then the FTO conductive glass was annealed at 400°C for 40min to obtain a 3 FTO conductive glass of the seed layer;

[0053] (3) Weigh 1.32g of sodium tungstate dihydrate and dissolve it in 22mL of deionized water, add 2.5mL of 3mol / L hydrochloric acid solution to adjust the pH value to about 2, then add 1.056g of ammonium sulfate and 8mL of ethylene glycol, and continue stirring for 30min. Obtain a stable tungsten ...

Embodiment 3

[0064] (1) Clean the FTO conductive glass sequentially with acetone, ethanol, and deionized water ultrasonically, each cleaning time is 20 minutes, and dry it for later use;

[0065] (2) Weigh 0.25g tungstic acid and dissolve it in 15mL hydrogen peroxide solution with a mass fraction of 30%, then add 50mL deionized water, continue stirring for 8h, after forming a preliminary sol, continue aging for 24h to obtain tungsten acid sol, and then the tungstic acid sol was spin-coated on the FTO conductive glass at a rate of 3000rpm, and the spin-coating time was 20s, and then the FTO conductive glass was annealed at 400°C for 40min to obtain a 3 FTO conductive glass of the seed layer;

[0066] (3) Weigh 1.32g of sodium tungstate dihydrate and dissolve it in 26mL of deionized water, add 2.5mL of 3mol / L hydrochloric acid solution to adjust the pH value to about 2, then add 1.056g of ammonium sulfate and 4mL of ethylene glycol, and continue stirring for 30min. Obtain a stable tungsten ...

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Abstract

The invention discloses a preparation method for a tungsten trioxide nanowire electrochromic film, which includes the following steps: (Step 1) tungstic acid and hydrogen peroxide solution are mixed, and after water is added for dilution, stirring is carried out for aging, so that sol is obtained; (Step 2) the sol is applied on a conductive glass, and after annealing treatment, a conductive glass with a WO3 seed crystal layer is obtained; (Step 3) tungstate and water are mixed, pH is regulated to strong acidity, ammonium sulfate and alcohol are then added, and after stirring, tungsten precursor solution is obtained; (Step 4) the conductive glass with the WO3 seed crystal layer in the step 2 is immersed in the tungsten precursor solution in step 3 to carry out hydrothermal reaction, and thereby the tungsten trioxide nanowire electrochromic film is obtained. The prepared WO3 nanowire electrochromic film has an supramaximal optical modulation range and a high electrochromic rate; when applied as an electrochromic smart window, the tungsten trioxide nanowire electrochromic film can greatly reduce solar radiation, and can also play the role of saving energy and regulating temperature; moreover, the process is simple and controllable, the cost is low, and the preparation method is suitable for industrialized application.

Description

technical field [0001] The invention relates to the field of electrochromic thin films, in particular to a preparation method of tungsten trioxide nanowire electrochromic thin films. Background technique [0002] Electrochromism (EC) refers to the phenomenon that the optical properties (reflectivity, transmittance, absorptivity) of materials undergo reversible and stable color changes under the action of an applied electric field. Because electrochromic materials have the advantages of low discoloration voltage, various color changes, energy saving and environmental protection, etc., they are widely used in smart windows, automobile anti-glare rearview mirrors, camouflage materials, electrochromic fabrics, information storage and detection, displays, etc. application prospects. [0003] Tungsten trioxide (WO 3 ) is a well-researched electrochromic material, which has stable chemical properties and good aesthetic effect of color change. its practical application. Currentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/34C01G41/02B82Y40/00
CPCC01G41/02C01P2002/72C01P2002/84C01P2004/03C01P2004/16C03C17/3417C03C2217/219C03C2217/231C03C2217/241C03C2217/70
Inventor 张溪文陈益
Owner ZHEJIANG UNIV
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