Method for preparing graphene

A technology of graphene and graphene powder, which is applied in the field of preparation of graphene powder products, and can solve the problems of physical and chemical performance loss, time-consuming, long process flow, etc.

Inactive Publication Date: 2012-06-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The redox method uses flake graphite as raw material, obtains graphite oxide through a series of oxidations, and then reduces graphite oxide to obtain graphene. This method can prepare a large number of cheap graphene materials, which can be applied to antistatic coatings, flexible and transparent In the fields of electronic equipment, high-performance components and nanomedicine, there are also defects: graphite oxidized by strong oxidants may not be completely reduced, resulting in the loss of some physical and chemical properties, especially electrical conductivity
This method can realize low-cost, continuous, large-scale production, but the process of this method is long and time-consuming

Method used

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Embodiment 1

[0024] Weigh 100 grams of micropowder graphite and 20 grams of ethanol respectively, mix the micropowder graphite and ethanol evenly, and then place them in a high-temperature autoclave. Seal the high-temperature autoclave well, then heat the high-temperature autoclave to 250 ° C, and keep it for 10 seconds, quickly remove the pressure of the high-temperature autoclave, take out the material in the autoclave, which is the primary product of graphene, and wash the primary product with ethanol repeatedly, Centrifuge and dry in vacuum at 200°C for 10 minutes to obtain the final graphene powder product. It is obtained through testing that the graphene content of less than 5 layers in the final graphene powder sample accounts for 90%.

Embodiment 2

[0026] Choose hexane as the organic solvent, expandable graphite as the carbonaceous raw material, mix 500 grams of expandable graphite and 1500 grams of hexane evenly, and then place it in a high-temperature autoclave. Seal the high-temperature autoclave well, heat it to 240°C, keep it for 300 seconds, quickly release the pressure of the high-temperature autoclave, take out the contents in the autoclave, weigh 400 grams of this substance and 1200 grams of hexane, mix them evenly, and then place In the high-temperature autoclave, seal the high-temperature autoclave, heat it to 240°C, keep it for 300 seconds, quickly remove the pressure from the high-temperature autoclave, take out the contents of the autoclave, weigh 300 grams of this substance, and 900 grams of hexane to make They are evenly mixed, then placed in a high-temperature autoclave, sealed the high-temperature autoclave, and heated to 240 ° C, kept for 300 seconds, quickly unloaded the pressure of the high-temperatur...

Embodiment 3

[0028] Weigh 40 grams of high-carbon graphite and 40 grams of dimethyl butane respectively, mix the high-carbon graphite and dimethyl butane evenly, and then place them in a high-temperature autoclave. Seal the high-temperature autoclave well, and heat it to 230°C, keep it for 150 seconds, quickly release the pressure of the high-temperature autoclave, take out the contents in the autoclave, weigh 20 grams of this substance and 20 grams of dimethyl butane, and mix them evenly , and then placed in a high-temperature autoclave, and heated to 230 ° C, kept for 150S, quickly unloaded the pressure of the high-temperature autoclave, took out the contents of the autoclave, and then weighed 10 grams of this substance and 10 grams of dimethylbutane to make them Mix evenly, then place in a high-temperature autoclave, seal the high-temperature autoclave, and heat it to 230 ° C, keep it for 150 seconds, quickly remove the pressure from the high-temperature autoclave, take out the material ...

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Abstract

The invention relates to a method for preparing graphene, characterized by carrying out explosion treatment for one or more times on carbonaceous materials by using fluids under supercritical state. By using the fluids under supercritical state to penetrate and dissolve the carbonaceous materials and having the aid of sudden release of high pressure hot steam, the shearing and peeling between layers of the carbonaceous materials are promoted to realize the preparation of graphene. Compared with using ball milling, mechanical peeling, high temperature and high pressure to prepare graphene in the prior art, the invention has the advantages of mild process conditions (low pressure), short process time, large area of prepared graphene, and complete preserved crystal structure. According to the invention, the content of graphene which comprises less than 5 layers is higher than 90 %, and the batch production of graphene powder products can be really realized.

Description

field of invention [0001] The invention relates to a preparation method of a graphene powder product. Background technique [0002] Graphene is a new carbonaceous material in which carbon atoms are closely packed into a single-layer two-dimensional honeycomb lattice structure. It is the basic unit for constructing other dimensional carbonaceous materials. The potential application value of electronic devices, information storage, biomedicine, sensors, energy storage materials, etc., has attracted widespread attention from the scientific community since it was discovered in 2004. After several years of related research, it has been used in the preparation of graphene and applications have made great progress. At present, the preparation methods of graphene are diversified, with both advantages and disadvantages. However, how to prepare high-quality graphene with complete structure, controllable size and layer number on a large scale is still one of the keys to the research a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
CPCY02P20/54
Inventor 刘必前汪前东李兰
Owner INST OF CHEM CHINESE ACAD OF SCI
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