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Method for preparing graphene or graphene oxide by using high-efficiency and low-cost mechanical stripping

A mechanical exfoliation and graphene technology, which is applied in the field of graphene or graphene oxide preparation, can solve the problems of incapable of mass production and low efficiency of micromechanical exfoliation

Inactive Publication Date: 2010-09-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is in order to solve the low efficiency of existing micro-mechanical exfoliation method, and the problem that can not mass-produce; And provide the method for high-efficiency and low-cost mechanical exfoliation to prepare graphene or graphene oxide

Method used

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specific Embodiment approach 1

[0011] Specific Embodiment 1: In this embodiment, the method for preparing graphene or graphene oxide by high-efficiency and low-cost mechanical exfoliation is carried out according to the following steps: carbon material powder with a particle size of 0.05-1000 μm and a particle size of 1 nm-100 μm The solid particles and liquid working medium are mixed for mechanical peeling. The liquid working medium has a surface tension of 10~73mN / m and a viscosity of 1~1×10 at the working temperature of mechanical peeling. 9 mPa·s, the peeling time is more than 5 minutes, and then the solid particles and liquid working medium are removed; that is, graphene or graphene oxide is obtained; wherein, the carbon material powder is graphite powder, expanded graphite, expandable graphite or graphite oxide Powder, add dispersant during the mechanical peeling process, the amount of dispersant is 0~20% of the liquid working medium.

[0012] The working temperature described in this embodiment must ...

specific Embodiment approach 2

[0014] Embodiment 2: This embodiment differs from Embodiment 1 in that: the weight ratio of the carbon material powder to solid particles is 1:0.1~10000, and the weight ratio of the carbon material powder to the liquid working medium is 1: 0.1~10000. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: This embodiment is different from Embodiment 2 in that: the weight ratio of the carbon material powder to solid particles is 1:1-2000. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention provides a method for preparing graphene or graphene oxide by using high-efficiency and low-cost mechanical stripping and relates to a preparation method of the graphene or the graphene oxide, solving the problems that the traditional micro-mechanical stripping method has low efficiency and can not be used for large-batch production. The method comprises the following step of separating carbon materials by utilizing solid particles and a liquid working medium (or gas working medium) and adopting mechanical stripping to obtain the graphene or the graphene oxide, wherein the carbon materials comprise graphite powder, expanded graphite, expandable graphite or graphite powder oxide. By using automatic machinery and using a great deal of solid particles for assisting stripping processes, the invention greatly increases the contact areas and the stripping times of the stripping processes, the carbon materials are subject to a great amount of stripping processes in a short time through the shearing and impacting functions of the solid particles on the carbon materials, and thereby the method obviously improves the stripping efficiency, has low cost and is suitable for the industrial and large-batch production of the graphene or the graphene oxide.

Description

technical field [0001] The invention relates to a preparation method of graphene or graphene oxide. Background technique [0002] Graphene is the thinnest two-dimensional material known so far. Single-layer graphene has an ideal two-dimensional crystal structure consisting of hexagonal lattices. Since it was successfully prepared, graphene has caused a new wave of research all over the world. Graphene has many peculiar characteristics, with excellent electrical, optical, thermal and mechanical properties, and is likely to cause revolutionary changes in many fields. The ideal single-layer graphene has a large specific surface area (2630m 2 / g), is a potential energy storage material. Graphene is a semiconductor without an energy gap, which has a much higher carrier mobility (2×10 5 cm 2 / (V.s)), there are micron-scale mean free paths and large coherence lengths at room temperature, so graphene is an ideal material for nanometer circuits; graphene has good conductivity, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C01B31/04
Inventor 王黎东费维栋
Owner HARBIN INST OF TECH
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