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Dispersion method for multilayer graphene

A multi-layer graphene, graphene dispersion technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve problems such as reducing graphene performance, and achieve the goal of maintaining intrinsic characteristics, reducing impact, and reducing costs. Effect

Active Publication Date: 2017-10-31
2D CARBON CHANGZHOU TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve efficient and stable dispersion of graphene, the surfactant coated on the surface of graphene will inevitably greatly reduce the performance of graphene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix 10% mass fraction of hydrogen peroxide with 10mol / L sulfuric acid at a volume ratio of 1:5; then add multilayer graphene to the acid solution, the mass ratio of multilayer graphene to acidic oxidation solution is 1:100, ultrasonic Shake for 20min, and heat and stir at 60°C for 2h. After the stirring is completed, the graphene is washed with water to remove acid by natural sedimentation, centrifugation or dialysis, and then the graphene aqueous slurry is obtained.

Embodiment 2

[0034] Mix 5% hydrogen peroxide with 5mol / L sulfuric acid at a volume ratio of 1:3; then add multilayer graphene to the acid solution, the mass ratio of multilayer graphene to acidic oxidation solution is 1:100, ultrasonic Shake for 60 minutes, and heat and stir at 80°C for 4 hours. After the stirring is completed, the graphene is washed with water to remove acid by natural sedimentation, centrifugation or dialysis, and then the graphene aqueous slurry is obtained.

Embodiment 3

[0036] Mix 3% hydrogen peroxide with 3mol / L sulfuric acid at a volume ratio of 1:2; then add multilayer graphene to the acid solution, the mass ratio of multilayer graphene to acidic oxidation solution is 1:1000, ultrasonic Shake for 60 minutes, and heat and stir at 80°C for 6 hours. After the stirring is completed, the graphene is washed with water to remove acid by natural sedimentation, centrifugation or dialysis, and then the graphene aqueous slurry is obtained.

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Abstract

The invention discloses a dispersion method for multilayer graphene. The method comprises the following steps: putting multilayer graphene into an acidic oxidation liquid, mixing and stirring; cleaning and disacidifying the graphene, thereby acquiring water-based graphene pulp; adding a solvent for diluting the water-based graphene pulp, thereby acquiring graphene dispersion liquid. According to the method disclosed by the invention, the efficient dispersion of the multilayer graphene can be realized, the huge energy consumption caused by high-power ultrasonic or grinding can be avoided and the cost can be greatly lowered; no surfactant (or dispersion auxiliary) is used, the influence of the impurities on the graphene performance is reduced and the subsequent material processing technology is obviously simplified; the efficient dispersion is lastly realized, the crystal structure of the graphene is protected from serious damage and the intrinsic characteristics of the graphene material can be kept.

Description

technical field [0001] The invention relates to a method for dispersing multilayer graphene. Background technique [0002] The ideal graphene is a two-dimensional carbon material composed of sp2 carbon, which has outstanding properties in mechanics and electricity. At present, the methods for large-scale preparation of graphene mainly include redox method, solvent stripping method (wherein electrochemical stripping, supercritical stripping, arc stripping) and other methods are derived. The graphene prepared by these methods is generally multilayer graphene. Compared with the ideal two-dimensional structure of graphene, multilayer graphene is composed of several layers or even tens of layers of graphene, with a thickness of several nanometers to tens of nanometers. While maintaining the ideal properties of graphene, multi-layer graphene has some characteristics of nano-powder materials. Multilayer graphene has a large specific surface area, and there is a strong delocalize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194
CPCC01B2204/20
Inventor 金虎宋琪彭鹏周振义马丽君
Owner 2D CARBON CHANGZHOU TECH INC
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