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Vanadium dioxide-graphene composite film structure, and preparation method and application thereof

A graphene composite and vanadium dioxide technology, which is applied in the direction of vanadium oxide, chemical instruments and methods, carbon compounds, etc., can solve the problem of low solar energy regulation efficiency of the visible light transmittance of smart windows, so as to improve the visible light transmittance, improve The effect of improving the solar light modulation ability and the phase change range

Inactive Publication Date: 2019-12-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention provides a vanadium dioxide and graphene composite thin film structure and its preparation method and application, to solve the problem of VO in the prior art. 2 The problem of low visible light transmittance and solar energy regulation efficiency of smart windows

Method used

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  • Vanadium dioxide-graphene composite film structure, and preparation method and application thereof
  • Vanadium dioxide-graphene composite film structure, and preparation method and application thereof
  • Vanadium dioxide-graphene composite film structure, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Base cleaning

[0032] The sapphire used for the substrate is double-polished sapphire with (001) crystal plane purchased on the market, with a thickness of 0.45 mm and a size of 1 cm*1 cm. Put the sapphire sheet in deionized water, absolute ethanol and acetone for 20 minutes to remove the organic impurities on the surface; then wash it with deionized water, and finally put the sapphire substrate in a constant temperature drying oven to dry for later use .

[0033] 2) Preparation of graphene film

[0034] Dilute and disperse the 0.50%wt graphene dispersion liquid purchased on the market and absolute ethanol according to the ratio of 1:10, and stir and shake with a magnetic stirrer for 30min. A KW-4A glue homogenizer was used for spin coating, and 50 μL of the diluted dispersion liquid was taken with a pipette gun each time, and the dispersion liquid was dropped on the sapphire substrate. The spin-coating parameters were 300r / min at a low speed for 5s, and 2000r / mi...

Embodiment 2

[0044] Steps 1, 3 and 5 are the same as in Example 1, except that the spin coating parameters in step 2 need to be changed to spin coating at a low speed of 300r / min for 2s; the holding time in step 4 is changed to 70s.

[0045] The electrical properties of this sample are as image 3 as shown in (b)

Embodiment 3

[0047] Steps 1, 3 and 5 are the same as in Example 1, except that the spin coating parameters in step 2 need to be changed to spin coating at a low speed of 300r / min for 5s; the holding time in step 4 is changed to 70s.

[0048] The electrical properties of this sample are as image 3 as shown in (c)

[0049] Conclusion: by image 3 (a)(b)(c) Comparing and calculating, it can be seen that the phase transition characteristic in (c) is the most obvious, and the phase transition amplitude is about 28.48 times, and Example 3 is the best solution. Next, its optical properties are analyzed, such as Figure 4 shown. Figure 4 (a)(b)(c) are single-layer VO 2 , VO 2 Composite graphene film (embodiment 3), the transmittance curve of three groups of samples of graphene film, this example is through calculation on the basis of traditional single-layer VO The visible light transmittance improves from 39.84% to 49.82%, and the sunlight modulation efficiency keep it steady. Therefore ...

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Abstract

The invention discloses a vanadium dioxide-graphene composite film structure, and a preparation method and application thereof. A sapphire substrate is spin coated with reduced graphene oxide; then, avanadium film is sputtered in a magnetron sputtering mode; rapid oxidation annealing is carried out in a rapid annealing furnace; and finally acid corrosion is carried out to form a graphene-VO2 nanoparticle composite film structure. According to the method disclosed by the invention, optical performance of VO2 intelligent windows is improved by overcoming defects in traditional surface modification anti-reflection film; a mode of compounding VO2 and graphene is adopted to load the VO2 film by graphene; the graphene is crimped during film formation, and then negative surface strain is applied to the VO2 film, so that the phase change temperature of VO2 is reduced; and meanwhile, the size of VO2 particles is changed, and the phase change amplitude is improved.

Description

technical field [0001] The invention relates to a composite film structure of vanadium dioxide and graphene, a preparation method and application thereof. Background technique [0002] In the past 30 years, with the trend of global energy shortage becoming more and more obvious, data from China Statistical Information Network shows that nearly 30% of the total energy consumption in the domestic society comes from building energy consumption. With the continuous acceleration of urbanization , The urban construction area is growing at a rate of 2 billion square meters per year. If effective building energy-saving measures are not taken, it will seriously affect the process of my country's ecological civilization construction and hinder the pace of sustainable development. At the same time, nearly 40% of building energy consumption comes from the energy consumption of glass doors and windows. Among them, windows, as the main heat exchange channel between buildings and the extern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01G31/02
CPCC01G31/02C01P2004/80C01B32/194
Inventor 梁继然张珂樊雅婕王双丽
Owner TIANJIN UNIV
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