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Graphene and preparation method thereof

A technology of graphene and graphite, which is applied in the field of graphene, can solve the problems of difficulty in the separation and transfer of graphene films, slow development of application fields, and limited graphene output, etc., to achieve suitable mass production, less defects, and maintain integrity sexual effect

Inactive Publication Date: 2017-02-01
北京中科云腾科技有限公司
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Problems solved by technology

However, none of the above methods can be used to prepare defect-free high-quality graphene in large quantities.
For example, although the solid phase mechanical exfoliation method can theoretically produce defect-free high-quality graphene, the yield of the obtained graphene is very limited.
Although the vapor deposition method can be used to prepare large-area graphene, its production process is complicated, the preparation conditions are harsh, the production cost is high, and the separation and transfer process of graphene film is very difficult, so this method still has great potential. limitation
In addition, although the redox method can realize the large-scale industrial production of graphene, the obtained graphene has compositional and structural defects, which greatly affect the various properties of graphene, which makes its development in the application field slow.

Method used

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  • Graphene and preparation method thereof

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preparation example Construction

[0019] In a first aspect, the invention provides a method for preparing graphene, wherein the method comprises the following steps:

[0020] (1) Mechanical exfoliation is carried out after graphite and liquid phase medium are mixed, obtain the mixture containing graphite and graphene;

[0021] (2) centrifuging the mixture containing graphite and graphene, and collecting the supernatant containing graphene.

[0022] According to the present invention, the term "mechanical exfoliation" has a well-known meaning in the art, and refers to exfoliating graphene thin layers from graphite by physical methods. Any physical method capable of stripping the graphene thin layer from graphite under the condition of liquid medium can be used in the present invention. For example, the mechanical stripping can be implemented in a grinding disperser, and the grinding disperser can be a Cmd2000-4 grinding disperser purchased from Shanghai Econ Machinery Equipment Co., Ltd.

[0023] The present ...

Embodiment 1

[0039] This embodiment is used to illustrate the graphene nano-sheets prepared according to the method of the present invention

[0040] Measure 4L of deionized water, then weigh 10g of sodium dodecylbenzenesulfonate and 10g of polyvinyl alcohol (PVA) into the deionized water, stir and sonicate until completely dissolved; add the dissolved deionized water into the grinding disperser In, and add 200g of graphite, continue stripping at room temperature, 80Hz frequency 5h; Obtain graphite-graphene mixture; Then the mixture is centrifuged at room temperature, 12000rpm 2h, collects the supernatant; Put the collected supernatant into Dry in a freeze dryer for 12 hours to obtain graphene nanosheets.

[0041] The SEM image of the resulting graphene nano-sheets is as follows figure 1 Shown, TEM image as figure 2 As shown, the AFM diagram is shown as image 3 Shown, electrical conductivity, yield and purity are shown in Table 1.

Embodiment 2

[0043] This embodiment is used to illustrate the graphene nano-sheets prepared according to the method of the present invention

[0044] Measure 4L of deionized water, then weigh 10g of polyvinylpyrrolidone (PVP) and 10g of polyvinyl alcohol (PVA) into the deionized water, stir and sonicate until completely dissolved; add the dissolved deionized water to grind and disperse In the machine, and add 300g graphite, at room temperature, the frequency of 70Hz continues to peel off 7h; Obtain graphite-graphene mixture; Then the mixture is at room temperature, centrifuge 3.5h under 9000rpm, collect supernatant; The supernatant collected The solution was put into a freeze dryer and dried for 20 h to obtain graphene nano-sheets.

[0045] The electrical conductivity, yield and purity of the obtained graphene nanosheets are shown in Table 1, and the SEM diagram, TEM diagram, and AFM diagram are similar to those in Example 1.

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Abstract

The present invention relates to the technical field of graphene material preparation, particularly to a graphene preparation method, which comprises: (1) mixing graphite and a liquid-phase medium, and mechanically stripping to obtain a mixture containing graphite and graphene; and (2) carrying out centrifugal separation on the mixture containing graphite and graphene, and collecting the graphene-containing supernatant. The present invention further discloses the graphene prepared through the method. According to the present invention, the prepared graphene has the good conductivity, wherein the highest conductivity can achieve 40000 S / m; with the method of the present invention, the structure of graphene cannot be destroyed, the integrity of the graphene lamina can be well maintained, and the Sp2 hybridization degree is high, ie., the defect of the prepared graphene is less; and the process is simple, the cost is reduced, and the preparation method is suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of graphene material preparation, in particular to a method for preparing graphene and graphene prepared by the method. Background technique [0002] Graphene is a two-dimensional planar structure composed of a single layer of carbon atoms. It is the thinnest material in nature known so far, with a theoretical thickness of only 0.335nm. This structure also endows graphene with excellent properties. Graphene has attracted widespread attention due to its ultra-high mechanical strength, good electrical and thermal conductivity, and unique electrical properties. [0003] In the past research process, graphene was usually prepared by solid phase mechanical exfoliation method, chemical vapor deposition method, epitaxial growth method, redox method and other methods. However, none of the above methods can be used to prepare defect-free high-quality graphene in large quantities. For example, although the solid pha...

Claims

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Application Information

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IPC IPC(8): C01B32/19
Inventor 李青春
Owner 北京中科云腾科技有限公司
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