Method for preparing graphene film

A graphene film, graphene dispersion technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as research on surface characteristics of less graphene, and achieve large-scale production and easy mass production. , the method is simple and easy to implement

Active Publication Date: 2013-05-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a lot of work is focused on the preparation of graphene, there are few researches on the surface properties of graphene. In order to expand the application field of graphene, it is necessary to be able to obtain graphene with different surface properties.

Method used

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  • Method for preparing graphene film
  • Method for preparing graphene film
  • Method for preparing graphene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the first step, take 200ml of 2mg / ml graphene oxide ethanol dispersion and pour it into the spray gun.

[0025] In the second step, the glass substrate was ultrasonically cleaned with acetone, ethanol, and deionized water for 30 minutes, and then dried and placed on a heating platform with the temperature set at 25°C.

[0026] In the third step, the dispersion liquid is sprayed onto the substrate with a spray gun to obtain a graphene oxide film.

[0027] The fourth step is to put the obtained graphene oxide film into a container containing hydrazine hydrate, seal it well, heat it to 95° C. and maintain it for 24 hours, and reduce it with hydrazine vapor to finally obtain a graphene film. figure 1 A picture of the surface morphology of the film.

[0028] In the fifth step, the wetting angle test was carried out to the prepared graphene film, such as figure 2 As shown, it can be seen that the wetting angle is about 82°, which indicates that the film is hydrophilic (...

Embodiment 2

[0030] The control method is basically the same as in Example 1, except that the substrate temperature is 50°C, and the surface picture of the obtained sample is image 3 shown, compared to figure 1 , appearing rougher; Figure 4 Its wetting angle test chart shows that the wetting angle is 105°, showing hydrophobic properties.

Embodiment 3

[0032] The control method is basically the same as in Example 1, except that the substrate temperature is 70°C, and the scanning electron microscope of the obtained sample is as follows: Figure 5 As shown, the surface becomes rougher compared to figure 1 , image 3 ; Figure 6 It is its wetting angle test chart, the wetting angle is about 137°, showing strong hydrophobic characteristics. Then, the obtained strongly hydrophobic sample is modified with carbon particles, that is, the sample is burned in a candle flame, Figure 7 It is the scanning electron microscope picture, it is obvious that carbon particles are attached to the graphene sheet; Figure 8 It is its wetting angle test, the wetting angle is 155°, showing super-hydrophobic properties.

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PUM

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Abstract

The invention discloses a method for regulating the wetting property of a graphene film. The regulating method comprises the following specific steps of spraying oxidized graphene dispersion liquid on a heated substrate with a spray gun, then carrying out hydrazine steam reduction on an obtained sample. In the process, the surface structure of the graphene film is changed by the change of the substrate temperature, and in order to achieve the super-hydrophobic characteristic, carbon granule modification needs to be conducted on the sample. In short, conversion of hydrophilicity-hydrophobicity-strong hydrophobicity-super-hydrophobicity is realized by changing the surface structure.

Description

technical field [0001] The invention relates to a method for regulating the wettability of a graphene film. Background technique [0002] With the discovery of graphene, its excellent electrical, mechanical, thermal and magnetic properties have attracted widespread attention. At the same time, methods for preparing graphene also emerge in endlessly, mainly including micromechanical exfoliation method (Novoselov KS, Geim AK, Morozov S V, Jiang D, Zhang Y, Dubonos SV et al.Science2004, 306, 666), chemical method (Stankovich S, Dikin DA, et al.Carbon2007, 45,1558) and epitaxial growth (Kim KS, ZhaoY, et al.Nature2009, 457,706). In addition, the surface of the material plays a very important role in the compatibility of the material with the environment. In many cases, although the properties of the material are excellent for some special applications, in many cases the surface should be treated accordingly to meet specific needs (Wang SR, Zhang Y, Abibi N, Cabrales L, Langmui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B31/04C01B32/192
Inventor 孙立涛毕恒昌万树吴幸尹奎波谢骁徐峰贺龙兵
Owner SOUTHEAST UNIV
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