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Preparation method of environmentally-friendly thermochromic vanadium dioxide film

A vanadium dioxide and thermochromic technology, which is applied in the field of preparation of environment-friendly thermochromic vanadium dioxide thin films, can solve the problems of low visible light transmittance, complicated process, influence visual effects and the like, and achieves visible light transmission. High rate, small surface roughness, good repeatability

Inactive Publication Date: 2017-06-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But oxalic acid is harmful to the human body, it will make the pH of the human body unbalanced, and the reduction is weak, and the amount of use is large, and the freeze-drying process also complicates the process
Although the vanadium dioxide thin films prepared by the above methods have high solar light modulation efficiency (ΔT sol ) is higher, but the visible light transmittance (T lum ) is not high, which affects the visual effect

Method used

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  • Preparation method of environmentally-friendly thermochromic vanadium dioxide film
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  • Preparation method of environmentally-friendly thermochromic vanadium dioxide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The thermochromic vanadium dioxide thin film is prepared by an environmentally friendly method, and the steps are as follows:

[0028] 1) First, use detergent solution, water, and absolute ethanol to ultrasonically clean the quartz glass substrate (2.5mm×2.5mm) for 10-20min to remove dirt, grease and other impurities on the surface, and place it in absolute ethanol stored in storage for use;

[0029] 2) Configure the precursor sol: add 0.5g vanadium pentoxide to 30mL deionized water, and then add 0.484g ascorbic acid after stirring (the molar ratio of vanadium pentoxide to ascorbic acid is 1:1), and stir at room temperature for 30min to obtain a uniform solution. When the solution turns dark brown-green at room temperature, add 2 mL of concentrated hydrochloric acid, then heat and stir in a water bath at 60°C until the solution is blue and transparent, then add 3.0 g of polyvinylpyrrolidone, and stir at room temperature to obtain the precursor Sol;

[0030] 3) Prepara...

Embodiment 2

[0033] The thermochromic vanadium dioxide thin film is prepared by an environmentally friendly method, and the steps are as follows:

[0034] 1) First, ultrasonically clean the quartz glass substrate (2.5mm×2.5mm) for 10-20min with detergent solution, water, and absolute ethanol to remove dirt, grease and other impurities on the surface, and place it in absolute ethanol stored in storage for use;

[0035] 2) Prepare precursor sol: add 3.0g vanadium pentoxide to 30mL deionized water, then add 1.453g ascorbic acid after stirring, stir at room temperature for 30min to obtain a uniform solution, and add 4mL when the solution turns dark brown-green at room temperature Concentrated hydrochloric acid, then heated and stirred in a water bath at 40°C until the solution was blue and transparent, then added 1.175g of polyvinylpyrrolidone, and stirred at room temperature to obtain a precursor sol;

[0036]3) Preparation of vanadium dioxide thin film: drop the precursor sol obtained in st...

Embodiment 3

[0040] The thermochromic vanadium dioxide thin film is prepared by an environmentally friendly method, and the steps are as follows:

[0041] 1) First, use detergent solution, water, and absolute ethanol to ultrasonically clean the quartz glass substrate (2.5mm×2.5mm) for 10-20min to remove dirt, grease and other impurities on the surface, and place it in absolute ethanol stored in storage for use;

[0042] 2) Prepare the precursor sol: add 1.0g vanadium pentoxide to 30mL deionized water, then add 0.484g ascorbic acid after stirring, stir at room temperature for 30min to obtain a uniform solution, and add 12mL when the solution turns dark brown-green at room temperature Concentrated hydrochloric acid, then heated and stirred in a water bath at 60°C until the solution was blue and transparent, then added 2.378g of polyvinylpyrrolidone, and stirred at room temperature to obtain a precursor sol;

[0043] 3) Preparation of vanadium dioxide thin film: drop the precursor sol obtain...

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Abstract

The invention relates to a preparation method of an environmentally-friendly thermochromic vanadium dioxide film. The preparation method comprises the followings steps: 1) dissolving vanadium pentoxide and ascorbic acid in deionized water to obtain a uniform solution, adding concentrated hydrochloric acid until the solution reacts to become dark brown and green, then heating in a water bath and stirring until the solution is blue and transparent, then adding polyvinylpyrrolidone, and stirring at room temperature to obtain a precursor sol; 2) spin-coating the precursor sol on the surface of a quartz glass substrate by adopting a spin-coating method to prepare a film, then drying the quartz glass substrate, and finally putting the quartz glass substrate in a high temperature furnace for annealing treatment so as to obtain the thermochromic vanadium dioxide film. The vanadium pentoxide is reduced by adopting non-toxic ascorbic acid with relatively high reducibility, and the vanadium dioxide film with uniform particle size, large porosity, relatively high visible light transmittance and sunlight modulation efficiency is obtained by adjusting the proportion of initial reactants, the concentration of the precursor sol and the addition of the concentrated hydrochloric acid.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and in particular relates to a preparation method of an environment-friendly thermochromic vanadium dioxide film. Background technique [0002] There are many crystal phases of vanadium dioxide, such as monoclinic phase (M), tetragonal rutile phase (R), and several metastable phases VO 2 (A), VO 2 (B), VO 2 (C) etc. However, among these crystalline phases of vanadium dioxide, only the rutile type of VO 2 The (R / M) phase can undergo a fully reversible semiconductor-to-metal transition (MIT) at 68 °C close to room temperature. In this reversible phase transition, there will be a sudden change in the near-infrared transmittance and reflectance before and after the phase transition. When the temperature is lower than the phase transition temperature, vanadium dioxide presents a monoclinic phase with semiconductor properties, and its infrared transmittance is high, while th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/23
CPCC03C17/23
Inventor 刘保顺邓赛君万美南王朔李驰赵修建
Owner WUHAN UNIV OF TECH
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