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Method for preparing graphene

A graphene and graphene technology, applied in the field of graphene preparation, can solve the problems of small specific surface area and limited graphene

Active Publication Date: 2017-03-15
内蒙古信敏惠纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The research on the preparation of graphene is earlier, and the most mature process is the oxidation-reduction method; there is a strong π-π conjugation between the sheets of graphene prepared by the oxidation-reduction method, and it is easy to occur between the sheets. Aggregation and stacking make the specific surface area of ​​graphene much smaller than its theoretical value, which limits the application of graphene

Method used

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preparation example Construction

[0034] The embodiment of the present invention provides a kind of preparation method of graphene, see figure 1 ,include:

[0035] Step 1) reacting graphene oxide and metal salt, so that oxygen-containing functional groups in the graphene oxide are complexed with metal ions in the metal salt to obtain graphene.

[0036] Among them, graphene oxide is the oxide of graphene, commonly in the form of powder, flake and solution; graphene oxide is generally obtained by oxidation of graphite with strong acid, and the most common method is: using potassium permanganate in concentrated sulfuric acid After the oxidation reaction with graphite powder, brown graphite flakes with derivatized carboxylic acid groups on the edge and mainly phenolic hydroxyl groups and epoxy groups on the plane are obtained. The graphite flakes are peeled off by ultrasonic or high-shear vigorous stirring. Graphene.

[0037] Wherein, the oxygen-containing functional group may be carboxyl group, hydroxyl group a...

Embodiment 1

[0080] The embodiment 1 uses the method provided by the embodiment of the present invention to prepare graphene.

[0081] Specifically include:

[0082] S1) Prepare graphene oxide aqueous solution with a concentration of 0.05g / L and a metal salt solution with a concentration of 1g / L respectively, wherein the metal ion in the metal salt is Cu 2+ 、Ni 2+ , Zn 2+ and Al 3+ ;

[0083] Specifically, add a certain amount of graphene oxide into water, and disperse it by ultrasonic for 180 minutes to obtain a graphene oxide aqueous solution; disperse a certain amount of metal salt in ethanol, and stir for 30 minutes to obtain a metal salt solution;

[0084] S2) preparing the reaction mixture of the graphene oxide and the metal salt;

[0085] Specifically, the metal salt solution is added to the graphene oxide aqueous solution at a rate of 10 L / min, and stirred while adding to make it evenly mixed to obtain a reaction mixture, wherein the graphene oxide and the metal salt The mass...

Embodiment 2

[0089] The embodiment 2 adopts the method provided by the embodiment of the present invention to prepare graphene.

[0090] Specifically include:

[0091] S1) Prepare graphene oxide aqueous solution with a concentration of 1.0g / L and a metal salt solution with a concentration of 10g / L respectively, wherein the metal ion in the metal salt is Cu 2+ and Ni 2+ ;

[0092] Specifically, adding a certain amount of graphene oxide into water, and ultrasonically dispersing for 10 minutes to obtain a graphene oxide aqueous solution; dispersing a certain amount of metal salt in ethanol, and stirring for 10 minutes to obtain a metal salt solution;

[0093] S2) preparing the reaction mixture of the graphene oxide and the metal salt;

[0094] Specifically, the metal salt solution is added to the graphene oxide aqueous solution at a speed of 30 L / min, and stirred while adding to make it evenly mixed to obtain a reaction mixture, wherein the graphene oxide and the metal salt The mass ratio...

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Abstract

The invention relates to the technical field of graphene, in particular to a method for preparing graphene. The method in an embodiment of the invention includes carrying out reaction on graphene oxide and metal salt; complexing oxygen-containing functional groups in the graphene oxide and metal ions in the metal salt to obtain the graphene. The method in the embodiment of the invention has the advantages that pi-pi conjugation between lamellas of the graphene can be reduced, aggregation and stacking among the lamellas can be decreased, and the specific surface area of the graphene can be increased; the shortcoming that the specific surface area of existing graphene is far smaller than theoretical values due to easiness in aggregation and stacking among lamellas of the existing graphene obtained in the prior art can be overcome; the method can be used for preparing the graphene.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, which has the characteristics of stable properties, good electrical conductivity, large specific surface area, and high specific strength. Anticorrosion, heat conduction film and other fields have broad application prospects. [0003] The research on the preparation of graphene is earlier, and the most mature process is the oxidation-reduction method; there is a strong π-π conjugation between the sheets of graphene prepared by the oxidation-reduction method, and it is easy to occur between the sheets. Aggregation and stacking make the specific surface area of ​​the graphene much smaller than its theoretical value, which limits the application of graphene. Contents of the invention [0004] The embodimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/192
CPCC01B2204/32
Inventor 丁天朋赵伟陈春辉
Owner 内蒙古信敏惠纳米科技有限公司
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