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Preparation method of tantalum-doped vanadium dioxide film

A technology of vanadium dioxide and vanadium pentoxide is applied in directions such as vanadium oxide to achieve the effects of reducing phase transition temperature, simple preparation method and improving visible light transmittance

Active Publication Date: 2021-11-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In some reference documents (CN201710130547.7, CN201710126410.4), some methods for preparing metal-doped vanadium dioxide powders are disclosed, but specific to tantalum-doped vanadium dioxide, it is still difficult to use the above general methods to achieve , and achieved a better phase transition effect

Method used

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  • Preparation method of tantalum-doped vanadium dioxide film
  • Preparation method of tantalum-doped vanadium dioxide film
  • Preparation method of tantalum-doped vanadium dioxide film

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1) Weigh 2.275g of vanadium pentoxide, 4.7275g of oxalic acid dihydrate and 50ml of absolute ethanol in a 250ml round-bottomed flask, connect a condenser tube to the round-bottomed flask and place it in an oil bath at 120°C for reflux reaction for 10 hours, after natural cooling A clear and transparent green vanadium precursor solution was obtained;

[0037] 2) Take 3ml of the above vanadium precursor solution and add 4 μl of tantalum ethoxide, stir and ultrasonically evenly, the molar ratio of tantalum to vanadium in the obtained tantalum-doped precursor solution is 1%;

[0038] 3) Coating the above solution by spin coating, take 150 μl precursor solution and evenly drop it on the cleaned quartz glass substrate, the first step is 500r / min for 5s, the second step is 3000r / min for 25s, and the film is placed on the heating table Dry at 80°C for 20 minutes;

[0039] 4) Place the dried film in a tube furnace, evacuate to 700mtorr, heat up to 550°C at 10°C / min, and keep it...

Embodiment 2

[0041] The difference between Example 2 and Example 1 is that the amount of tantalum ethoxide added is 16.2 μl, and the molar ratio of tantalum to vanadium in the obtained tantalum-doped precursor solution is 4%.

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Abstract

The invention discloses a preparation method of a tantalum-doped vanadium dioxide film, which comprises the following steps: 1) dissolving vanadium pentoxide and a reducing agent in an organic solvent, and conducting reacting to obtain a precursor solution; 2) mixing the precursor solution with a soluble tantalum source, and dispersing the tantalum source in the precursor solution to obtain a coating solution; and (3) preparing a film from the film coating liquid on a substrate, conducting drying, and carrying out heat treatment to obtain the tantalum-doped vanadium dioxide film. The preparation method is simple, the raw materials are simple, and the requirements on equipment are low, so that the production cost is low. By controlling the content of the tantalum element added into the precursor, the VO2 thin film with expected tantalum doping concentration can be obtained, so that the phase change temperature and the thermal hysteresis loop width of the VO2 thin film are remarkably reduced along with the increase of the tantalum doping amount, the visible light transmittance of the thin film can be effectively improved, and meanwhile, the sunlight adjusting efficiency of the thin film is kept unchanged.

Description

technical field [0001] The invention relates to a method for preparing a tantalum-doped vanadium dioxide film. 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 greatly reduced, and it has a certain ability to adjust sunlight, which makes the vanadium dioxide film can be applied to windows. Play the role of warm in winter and cool in summer....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
CPCC01G31/02C01P2002/72C01P2004/03C01P2002/85C01P2002/84C01P2002/82C01P2004/20
Inventor 赵修建李彬田守勤
Owner WUHAN UNIV OF TECH