Preparation method of intelligent temperature control color changing vanadium oxide film

A vanadium oxide thin film and intelligent temperature control technology, applied in the field of material chemistry, can solve the problems of difficult doping of tungsten coating solution with doped tungsten sources, low efficiency of phase transition temperature reduction, and difficulty in achieving effective doping, etc., achieving broad application prospects, Comprehensive performance improvement and long-term stable effect

Inactive Publication Date: 2014-04-02
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, when the tungsten-doped vanadium oxide film is prepared by the sol-gel method, it has been reported that there are three main problems in the doped tungsten source used as a dopant: First, it is difficult for the doped tungsten source to coexist stably with the vanadium-containing sol to form a uniform tungsten-doped film. Coating solution; second, W atoms in the doped tungsten source with low activity are difficult to enter the vanadium oxide lattice to replace V atoms, but exist in the vanadium oxide film in the form of tungsten compounds, so it is difficult to achieve the purpose of effective doping; Some doped tungsten sources (such as WCl6, ammonium tungstate, sodium tungstate, etc.) contain other impurity elements (such as N, Cl, Na, etc.), and other impurities (N, Cl, Na, etc.) will be introduced while doping W Elements, which have adverse effects on improving the infrared adjustment performance of the film and reducing the phase transition temperature of the film
The phase transition temperature of the tungsten-doped vanadium oxide film prepared by this method can be reduced to 35°C when doped with 2% tungsten, but the reduction efficiency of the phase transition temperature is much lower than 23°C / at.%W
In addition, tungsten sol as a source of doped tungsten can only exist stably under acidic conditions, which limits its application range

Method used

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  • Preparation method of intelligent temperature control color changing vanadium oxide film
  • Preparation method of intelligent temperature control color changing vanadium oxide film
  • Preparation method of intelligent temperature control color changing vanadium oxide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 1.25g of tungstic acid powder into a beaker, add 10mL of hydrogen peroxide with a concentration of 30wt% and 10mL of methanol into the beaker containing tungstic acid powder at the same time, heat and stir in a water bath at 45°C for 24h until the solid powder is completely dissolved, and centrifuge The transparent tungsten-containing sol with a tungsten ion concentration of 0.3 mol / L can be obtained by filtration.

[0042] 0.663 g of vanadyl acetylacetonate was added to 25 mL of methanol, stirred at room temperature, and when the methanol was volatilized to 20 mL, centrifugal filtration was performed to obtain a dark green vanadium ion-containing sol. 1.5% by mass of polyvinylpyrrolidone (PVP) was added to the above sol, then 0.08 mL of the tungsten-containing sol prepared above was added to the above sol, and a stable tungsten-doped coating solution was obtained after stirring at room temperature for 18 hours. The molar ratio of tungsten to vanadium in the coati...

Embodiment 2

[0047] The tungsten-containing sol was prepared by the same method as in Example 1.

[0048] 0.663 g of vanadyl acetylacetonate was added to 25 mL of methanol, stirred at room temperature, and when the methanol was volatilized to 20 mL, centrifugal filtration was performed to obtain a dark green vanadium ion-containing sol. PVP with a mass percentage of 1.5% was added to the above sol, then 0.16 mL of tungsten-containing sol was added to the above sol, and a stable tungsten-doped coating solution was obtained after stirring at room temperature for 20 hours. The molar ratio of tungsten to vanadium in the coating solution was 2:100.

[0049] The quartz glass was ultrasonically washed successively with deionized water, acetone and ethanol, and the ultrasonic washing time was 15 minutes, and the cleaned quartz glass pieces were placed in alcohol and stored for later use. The spin coating method was used to coat the films. After each layer of film was plated, it was baked at 80 °C...

Embodiment 3

[0053] The tungsten-containing sol was prepared by the same method as in Example 1.

[0054] 0.663 g of vanadyl acetylacetonate was added to 25 mL of methanol, stirred at room temperature, and when the methanol was volatilized to 20 mL, centrifugal filtration was performed to obtain a dark green vanadium ion-containing sol. PVP with a mass percentage of 1.5% was added to the above sol, then 0.4 mL of tungsten-containing sol was added to the above sol, and a stable tungsten-doped coating solution was obtained after stirring at room temperature for 24 hours. The molar ratio of tungsten to vanadium in the coating solution was 5:100.

[0055] The quartz glass was ultrasonically washed successively with deionized water, acetone and ethanol, and the ultrasonic washing time was 20 minutes, and the cleaned quartz glass pieces were placed in alcohol and stored for later use. The spin coating method was used to coat the films. After each layer of film was plated, it was baked at 80 °C ...

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Abstract

The invention relates to a preparation method of an intelligent temperature control color changing vanadium oxide film, which is characterized by comprising the following steps: (1) preparing tungstenic sol; (2) preparing sol comprising vanadium ions; (3) preparing tungsten-doped vanadium oxide sol, i.e. adding the tungstenic sol obtained in the step (1) into the sol comprising vanadium ions, which is obtained in the step (2), so as to obtain the tungsten-doped vanadium oxide sol; and (4) preparing a tungsten-doped vanadium oxide film, i.e. plating the tungsten-doped vanadium oxide sol obtained in the step (3) on the surface of a washed substrate and then carrying out annealing processing in the inert atmosphere or under the vacuum condition so as to obtain the tungsten-doped vanadium oxide film with an intelligent temperature control color changing function. The method disclosed by the invention has low energy consumption, adopts a simple preparation process, has high safety and has wide application prospect in the field of photoelectronic functional materials.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and particularly relates to a preparation method of a tungsten-doped vanadium oxide thin film. Background technique [0002] With the continuous development of social economy, modern buildings have higher and higher requirements for light transmission and energy saving. In addition to lighting, sheltering from wind, and sheltering from rain, window glass also has functions such as heat preservation, control and utilization of sunlight. In terms of energy saving in buildings or indoors, due to the increasingly perfect wall materials, the heat transfer coefficient of walls with appropriate thickness is only 1.4W / (M 2 ·K), while the heat transfer coefficient of 3mm thick ordinary architectural glass reaches 5.8W / (M 2 ·K). Therefore, window glass is one of the key factors affecting the energy-saving effect of buildings, and 50% of the energy consumption of buildings is caused by the poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12
Inventor 陶海征彭飞乔昂赵修建
Owner WUHAN UNIV OF TECH
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