Preparation method of graphene

A technology of graphene and graphite, which is applied in the field of graphene preparation, can solve the problems of long cycle, complex production process, high production cost, etc., and achieve the effect of short production cycle, simple processing technology and reduced production cost

Inactive Publication Date: 2018-01-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the reduced graphene oxide method can prepare graphene in large quantities, a large amount of strong corrosive oxidants such as concentrated sulfuric acid, potassium permanganate, and perchloric acid mus...

Method used

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  • Preparation method of graphene
  • Preparation method of graphene
  • Preparation method of graphene

Examples

Experimental program
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Embodiment 1

[0033] In the present embodiment, the preparation method of graphene is completed according to the following steps:

[0034] Heat graphite powder with an average particle size of 50 microns in a closed container to a temperature of about 600°C and a pressure of 300kPa, maintain this pressure for 10 minutes, and then quickly depressurize to atmospheric pressure. The above operation was repeated four more times, and the obtained product was ground and dispersed in a 1:4 mixed solution of phenol and ethanol by weight to obtain multilayer graphene.

[0035] attached by figure 1 and figure 2 It can be obtained from the analysis that the graphene prepared in this embodiment has a thickness of 64 nanometers and a layer number of about 190 layers. The graphene thickness that present embodiment prepares utilizes atomic force microscope (AFM) to measure, appendix figure 1 For the prepared graphene AFM photo of the present embodiment, appended figure 2 The calculation diagram of th...

Embodiment 2

[0037] In the present embodiment, the preparation method of graphene is completed according to the following steps:

[0038] The 190-layer graphene prepared in Example 1 was pressurized to 500kPa, maintained at this pressure for 7 minutes, quickly decompressed to atmospheric pressure, and repeated the above operation three times. Grind and disperse in the mixed solution to obtain thinner graphene.

[0039] attached by image 3 and Figure 4 It can be obtained from the analysis that the graphene prepared in this embodiment has a thickness of 18 nanometers and about 50 layers.

Embodiment 3

[0041] In the present embodiment, the preparation method of graphene is completed according to the following steps:

[0042] Pressurize the 50 layers of graphene prepared in Example 2 to 700kPa, maintain this pressure for 5 minutes, quickly depressurize to atmospheric pressure, repeat the above operation twice, and the resulting product is mixed with toluene, ethanol and ether according to the weight ratio of 1:8 :1 in the mixed solution to grind and disperse to obtain thinner graphene.

[0043] attached by Figure 5 and Figure 6 It can be obtained from the analysis that the graphene prepared in this embodiment has a thickness of 6.5 nanometers and about 20 layers.

[0044] The results of the examples show that the single-machine production efficiency of graphene prepared by the present invention reaches 10Kg / h, and the production cost can be reduced to 300,000 yuan / t.

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Abstract

The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene. The operation steps of the method are as follows: after the graphite powder is pressurized in a pressure vessel, the graphite powder is rapidly decompressed to expand it to obtain graphene; and the above-mentioned expansion operation is repeated until the required number of layers of graphene is obtained. In the optimized scheme, the expanded graphene is added into a volatile dispersant for grinding and dispersing. The invention has simple processing technology, short production cycle, and is suitable for large-scale industrial production. Strong oxidizing and strong corrosive chemicals are not used in the process, which greatly reduces the hazards to operators and the risk of environmental pollution during the production process, and also The production cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene. Background technique [0002] Graphene is a two-dimensional crystal, which is composed of carbon atoms arranged in a hexagonal shape and connected to each other to form a graphene sheet with a thickness of carbon atoms, and its structure is very stable. The common graphite is formed by stacking layers of planar carbon atoms arranged in a honeycomb order. The interlayer force of graphite is weak, and it is easy to peel off each other to form thin graphite sheets. Single-layer graphene is only one carbon atom thick, that is, 0.335 nanometers, which is equivalent to the thickness of one 200,000th of a hair. There are nearly 1.5 million layers of graphene in graphite with a thickness of 1 mm. When the graphite sheet is peeled into a single layer, this single layer with only one carbon atom thickness is single-layer graphene; the graphite...

Claims

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Application Information

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IPC IPC(8): C01B32/19
Inventor 隋殿鹏陈华夏
Owner NORTHEASTERN UNIV
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