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Preparation method of graphene

A technology of graphene and graphene, which is applied in the field of graphene preparation, can solve problems such as high preparation cost, easy agglomeration, and impact on application, and achieve the effects of simple preparation method, high single-layer rate, and uniform sheet diameter

Inactive Publication Date: 2016-11-09
SHANDONG OBO NEW MATERIAL CO LTD
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Problems solved by technology

[0007] Although chemical vapor deposition and redox methods can produce graphene in large quantities, the transfer process of graphene in the later stage of chemical vapor deposition is more complicated, and the preparation cost is higher. In addition, the growth and connection of C inside the substrate often exist. defect
When the redox method is used to prepare, because the single-layer graphene is very thin, it is easy to agglomerate, resulting in the reduction of the electrical conductivity and specific surface area of ​​graphene, which further affects its application in optoelectronic devices.

Method used

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[0028] The invention provides a preparation method of graphene, comprising: ultrasonicating the graphene oxide aqueous solution, then adjusting its pH value to be alkaline, adding a reducing agent and an alcohol polymer, and heating and reacting to obtain graphene.

[0029] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0030] In the present invention, the graphene oxide aqueous solution is firstly ultrasonicated; the mass concentration of graphene oxide in the graphene oxide aqueous solution is preferably 0.2%-0.35%, more preferably 0.25%-0.35%, and most preferably 0.3%. If the mass fraction of graphene oxide in the graphene oxide aqueous solution is too low, the efficiency will be low, and if it is too high, it will affect the subsequent reduction effect, resulting in incomplete reduction and agglomeration.

[0031] Ultrasound can further stratify graphene oxide, disperse and break up at the same ti...

Embodiment 1

[0040] Ultrasonicate 2L graphene oxide aqueous solution with a mass concentration of 0.3% at 20KHz, 2KW power for 2h, adjust its pH value to 10.5 with ammonia water, then add 3.6g hydrazine hydrate and 2g polyethylene glycol to stir, and control the reaction temperature to 90°C , reacted for 14 hours, and finally cooled down naturally, and washed with water until the pH value was 8 to obtain a graphene aqueous solution.

[0041] figure 1 It is the appearance photo of the graphene aqueous solution obtained in embodiment 1.

[0042] Utilize scanning electron microscope to scan the Graphene that obtains in embodiment 1, obtain its scan photo such as figure 2 shown.

[0043] Utilize X-ray diffraction to analyze the graphene that obtains in embodiment 1, obtain its X-ray diffraction pattern, as image 3 shown.

[0044] Utilize atomic force microscope to analyze the graphene obtained in embodiment 1, obtain its atomic force micrograph, as Figure 4 shown. Depend on Figure 4 I...

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Abstract

The invention provides a preparation method of graphene. The method comprises steps as follows: a graphene oxide aqueous solution is subjected to ultrasonic treatment, then the pH value of the solution is adjusted to be alkaline, a reducing agent and an alcohol polymer are added, and graphene is obtained after the mixture is heated to be subjected to a reaction. Compared with the prior art, the method has the advantages that the graphene oxide aqueous solution is subjected to ultrasonic treatment, graphene oxide is layered and dispersed further, and the alcohol polymer is added to the solution to be used as a polymerization inhibitor, so that obtained graphene is high in single-layer ratio and uniform in flake diameter; besides, the preparation method is simple, and the cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a preparation method of graphene. Background technique [0002] In 2004, Gein prepared and observed single-layer graphene for the first time, which set off a research boom of graphene materials. Graphene is the thinnest and toughest material that people have discovered so far. It also has high electrical and thermal conductivity, making it play a huge role in many fields such as electrochemistry and biomedicine. [0003] Since the discovery of graphene, various methods for preparing graphene have been developed. The commonly used preparation methods include micromechanical exfoliation method, epitaxial growth method, chemical vapor deposition CVD method and graphite oxide reduction method, etc. [0004] Among them, the micromechanical exfoliation method is to use scotch tape to press the highly oriented pyrolytic graphite sheet to other surfaces for multiple exfoliation, and f...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01P2002/74C01P2004/03C01P2004/04
Inventor 张在忠程金杰吴开付胡兴华
Owner SHANDONG OBO NEW MATERIAL CO LTD
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