Method for preparing tungsten-doped porous vanadium dioxide powder and thin film by virtue of cotton sacrifice template method

A vanadium dioxide, sacrificial template technology, applied in vanadium oxide, nanotechnology for materials and surface science, nanotechnology, etc. Vanadium oxide film phase transition temperature visible light transmittance, film phase transition temperature does not decrease and other problems, to ensure visible light transmittance, improve visible light transmittance, and achieve excellent main performance effects

Inactive Publication Date: 2018-12-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure vanadium dioxide film has to face the following three main problems: ① the phase transition temperature is too high (68 ℃); ② the transmittance of visible light is low at low temperature (<40%); ③ the ability to modulate sunlight Limited (<10%)
At the present stage, tungsten doping technology not only reduces the phase transition temperature, but also reduces the visible light transmittance and solar light modulation efficiency of the vanadium dioxide film to a relatively low level.
In addition, although some research results that have been published so far can use different methods to simultaneously improve the visible light transmittance and solar light modulation efficiency of the vanadium dioxide film, the phase transition temperature of the film has not decreased, and it is still maintained at about 68°C.
[0004] To sum up, there is currently no one that can achieve the triple purpose of "effectively reducing the phase transition temperature of vanadium dioxide thin films", "ensuring high visible light transmittance of thin films" and "ensuring high solar light modulation efficiency of thin films". Vanadium dioxide thin film material and preparation method thereof

Method used

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  • Method for preparing tungsten-doped porous vanadium dioxide powder and thin film by virtue of cotton sacrifice template method
  • Method for preparing tungsten-doped porous vanadium dioxide powder and thin film by virtue of cotton sacrifice template method
  • Method for preparing tungsten-doped porous vanadium dioxide powder and thin film by virtue of cotton sacrifice template method

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Experimental program
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Effect test

Embodiment 1

[0036] 1) Weigh 0.4g (0.0022mol) vanadium pentoxide, 0.0046g (7.326*10 -7 mol) ammonium tungstate and 0.832g (0.0066mol) oxalic acid dihydrate in a 100mL beaker, then add 30mL deionized water, place the beaker in a water bath at 80°C and stir for 20min to obtain a blue precursor solution;

[0037] 2) Take out the beaker and keep stirring, add 30mL of ethylene glycol after cooling to room temperature, and continue stirring for 10min to obtain a homogeneous solution;

[0038] 3) Slowly add ammonia water dropwise to the above homogeneous solution to adjust the pH of the solution to 7;

[0039] 4) Add the mixed solution and 0.4g of absorbent cotton into a 100mL reactor, put the reactor into an oven for hydrothermal reaction at 180°C for 24 hours, and take it out after cooling down to room temperature naturally;

[0040] 5) Take out the absorbent cotton in the reaction kettle, first wash it twice with deionized water, then wash it once with ethanol, and then put it in an oven at 8...

Embodiment 2

[0058] 1) Weigh 0.4g (0.0022mol) vanadium pentoxide, 0.0023g (7.326*10 -7 mol) ammonium tungstate and 0.832g (0.0066mol) oxalic acid dihydrate in a 100mL beaker, then add 30mL deionized water, place the beaker in a water bath at 80°C and stir for 25min to obtain a blue precursor solution;

[0059] 2) Take out the beaker and keep stirring, add 30mL of ethylene glycol after cooling to room temperature, and continue stirring for 10min to obtain a homogeneous solution;

[0060] 3) Slowly add ammonia water dropwise to the above homogeneous solution to adjust the pH of the solution to 8;

[0061] 4) Add the mixed solution and 0.35g of absorbent cotton together into a 100mL reaction kettle, put the reaction kettle into an oven, conduct a hydrothermal reaction at 180°C for 20h, and take it out after naturally cooling to room temperature;

[0062] 5) Take out the absorbent cotton in the reaction kettle, first wash it twice with deionized water, then wash it once with ethanol, and then...

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Abstract

The invention relates to a method for preparing tungsten-doped porous vanadium dioxide powder and a thin film by virtue of a cotton sacrifice template method. The method comprises the steps of firstlypreparing tungsten-doped porous vanadium dioxide powder from vanadium pentoxide, ammonium tungstate, oxalic acid and other materials through combination of hydrothermal reaction and the cotton sacrifice template method, preparing suspension liquid from the powder, and preparing the tungsten-doped porous vanadium dioxide thin film with excellent performance by virtue of a spin-coating method. Theprepared tungsten-doped porous vanadium dioxide powder has more small mesoporous structures and higher porosity, so that the visible light transmittance of the thin film can be effectively increased,and the sunlight modulation efficiency can be effectively improved; and by doping tungsten, the phase-transition temperature of the thin film can be effectively decreased.

Description

technical field [0001] The invention relates to the technical field of inorganic nanometer materials and thermochromic materials, in particular to a method for preparing tungsten-doped porous vanadium dioxide powder and film by using a cotton sacrificial template method. Background technique [0002] Vanadium dioxide (VO 2 ) is considered to be a very promising thermochromic material because it undergoes a reversible phase transition from a high-temperature metal phase (R phase) to a low-temperature semiconductor phase (M phase) near 68 °C, and its crystal structure changes from tetragonal The rutile structure transforms into a monoclinic structure, and along with the transformation of the crystal structure, the electrical and optical properties of vanadium dioxide will change abruptly. Among them, after the transformation from M phase to R phase, the transmittance of visible light is almost unchanged, while the transmittance of near-infrared light is reduced, and it has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82Y30/00C03C17/25
CPCC01G31/02B82Y30/00C01P2002/72C01P2002/80C01P2002/85C01P2002/88C01P2004/04C01P2004/62C01P2004/64C01P2006/17C03C17/25C03C2217/24C03C2217/70C03C2218/116
Inventor 赵修建田守勤李彬
Owner WUHAN UNIV OF TECH
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