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A nano-VO2 film with superhydrophilic self-cleaning and intelligent temperature control functions and its preparation method

A self-cleaning, super-hydrophilic technology, applied in the field of nano-VO2 film and its preparation, can solve the problems of inability to reduce the phase transition temperature of vanadium dioxide, the application limitation of vanadium dioxide film, and the self-cleaning of smart windows. Good intelligent temperature control effect, excellent phase change performance, and low infrared light transmittance

Active Publication Date: 2018-06-12
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese published invention patent CN103014701A discloses a method for preparing vanadium dioxide film by atomic layer deposition equipment. Although the quality of the vanadium dioxide film prepared by this method is relatively good, it does not involve doping and cannot reduce the phase of vanadium dioxide. Variable temperature, so that the application of vanadium dioxide film is greatly limited
Chinese published invention patent CN102241482A discloses an intelligent temperature-controlled vanadium dioxide nanocomposite multifunctional film and its preparation method. Intelligent temperature control effect, but failed to solve the self-cleaning problem as a smart window

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  • A nano-VO2 film with superhydrophilic self-cleaning and intelligent temperature control functions and its preparation method
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  • A nano-VO2 film with superhydrophilic self-cleaning and intelligent temperature control functions and its preparation method

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preparation example Construction

[0033] The invention provides a VO with superhydrophilic self-cleaning and intelligent temperature control functions 2 The preparation method of film, its step is as follows:

[0034] 1) Mix the tetravalent vanadium source and the tungsten source with the solvent alcohol, stir evenly and leave it to stand for aging to obtain a precursor solution, wherein the molar ratio of the hexavalent tungsten in the tungsten source and the tetravalent vanadium in the tetravalent vanadium source is ( 0-10%): 1;

[0035] 2) The obtained precursor solution is directly and uniformly coated on the substrate, and annealed in an inert gas atmosphere to obtain a VO with superhydrophilic self-cleaning and intelligent temperature control functions. 2 film.

Embodiment 1

[0037] A VO with superhydrophilic self-cleaning and intelligent temperature control functions 2 The preparation method of film, its step is as follows:

[0038] 1) Take 1g of vanadyl acetylacetonate (VO(acac) 2 ) into a beaker, add 30ml of methanol, place it on a magnetic stirrer and stir for 24 hours, leave it to age for 48 hours, and obtain a dark blue precursor solution;

[0039] 2) Add the precursor solution dropwise on the surface of the quartz glass on the spin coater, spin coat at a speed of 2000r / min, dry it and place it in a tubular muffle furnace, and anneal it under argon protection at a high temperature of 600°C for 1h. That is, a VO with superhydrophilic self-cleaning and intelligent temperature control functions is obtained. 2 film.

[0040] figure 1 , figure 2 , Figure 4 (a) are the UV, thermal hysteresis curve and scanning (SEM) spectrum of the film obtained in this embodiment, respectively. It can be seen from the UV spectrum that the prepared vanadiu...

Embodiment 2

[0042] A VO with superhydrophilic self-cleaning and intelligent temperature control functions 2The preparation method of film, its step is as follows:

[0043] 1) According to the molar ratio of hexavalent tungsten and tetravalent vanadium is 0:1, take 1g of vanadyl oxalate (VOC 2 o 4 ·5H 2 O) in a beaker, add 50ml of ethanol, place it on a magnetic stirrer and stir for 72 hours, leave it to age for 96 hours, and obtain a dark blue precursor solution;

[0044] 2) Add the precursor solution dropwise on the surface of the glass substrate on the spin coater, spin coat at a speed of 6000r / min, put it in a tubular muffle furnace after drying, and anneal for 1.5h under nitrogen protection at a high temperature of 500°C. That is, a VO with superhydrophilic self-cleaning and intelligent temperature control functions is obtained. 2 film.

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Abstract

The invention relates to a nano VO2 film with a superhydrophilic self-cleaning function and an intelligent temperature control function and a preparation method of the nano VO2 film. The preparation method of the nano VO2 film comprises the steps that firstly, a precursor solution of vanadium dioxide is prepared through a sol-gel method; then a substrate is evenly coated with the precursor solution; and finally one-step annealing is conducted, so that the nano VO2 film is obtained. A corresponding tungsten-doped VO2 film can be obtained by directly adding a tungsten source in the precursor solution, and the phase-change temperature can be adjusted to 32 DEG C; the crystal sizes of VO2 particles can be changed through tungsten ion doping, a certain micro-nano structure is formed on the surface of the substrate, and the superhydrophilic self-cleaning function at the water contact angle of 12 degrees is achieved; in addition, the difference of the light transmittance before the phase change and the light transmittance after the phase change of the film in the position with the visible light transmittance being 80% and the wavelength being 2000 nm is 26%, and an extremely good intelligent temperature control effect is achieved.

Description

technical field [0001] The invention relates to the field of thermal phase change materials and self-cleaning energy-saving materials, in particular to a nano VO with superhydrophilic self-cleaning and intelligent temperature control functions 2 Thin films and methods for their preparation. Background technique [0002] As early as 1959, Morin first discovered vanadium dioxide (VO 2 ) has good metal-semiconductor phase transition (MIT) properties, this phase transition of vanadium dioxide and its accompanying abrupt changes in optical and electrochemical properties have become a focus of attention. Vanadium dioxide is a thermally induced phase change material with a phase transition temperature of about 68°C. When the temperature is higher than 68°C, VO 2 It transforms into R-phase rutile structure, showing metallic properties; when the temperature is lower than 68°C, it will transform into M-phase monoclinic structure, showing semiconductor properties. Simultaneously wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/12
CPCC23C18/1216C23C18/1254
Inventor 赵丽梁子辉钟诚王亚兰董兵海许祖勋王世敏
Owner HUBEI UNIV
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