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Method for producing graphene

A graphene and graphite technology, which is applied in the preparation of the latest two-dimensional nano-carbon material-graphene, can solve problems such as the destruction of the crystal structure of graphite, and achieve the effects of expanding the scale, improving the grinding and peeling effect, and facilitating the scale.

Active Publication Date: 2010-05-12
HUAQIAO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two ball milling methods failed to completely exfoliate graphite to obtain graphene effectively.
At the same time, during the ball milling process, the rigid collision of the ball along the normal direction will cause damage to the graphite crystal structure.

Method used

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  • Method for producing graphene
  • Method for producing graphene
  • Method for producing graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0030]A kind of method for producing graphene, realizes by following scheme: Accurately take by weighing 0.1g of expanded graphite micropowder, it is uniformly dispersed in 320mL N by mechanical agitation, in N-dimethylformamide, forms graphite suspension, this graphite After the suspension is evenly divided into 4 parts, each part is put into a 100mL polytetrafluoroethylene ball milling jar with zirconia balls coated with polytetrafluoroethylene with a thickness of about 1mm on the surface. The weight ratio of zirconia balls of vinyl fluoride to expanded graphite powder is about 10000:1, and four polytetrafluoroethylene ball milling tanks filled with zirconia balls wrapped with polytetrafluoroethylene and expanded graphite powder suspension are symmetrical Put it into a planetary mill and ball mill for 30 hours at a speed of 300 rpm. Pour the ball-milled graphite suspension into a beaker and let it stand for 40 hours, take out the suspended part and add N, N-dimethylformamide...

Embodiment 2

[0032] A method for producing graphene, realized by the following scheme: Accurately weigh 0.25g of flake graphite micropowder, uniformly disperse it in 320mL N-methylpyrrolidone by mechanical stirring, form a graphite suspension, divide this graphite suspension on average After 4 parts, each part is put into a 100mL polytetrafluoroethylene ball milling tank together with alumina balls coated with nylon with a thickness of about 1.2mm on the surface, and alumina balls and scales wrapped with nylon on the surface The weight ratio between the graphite micropowders is about 6000:1, and four ball milling tanks containing nylon-wrapped alumina balls and flake graphite micropowder suspensions are symmetrically placed in a planetary mill and ball milled at a speed of 320 rpm for 40 Hour. Pour the ball-milled graphite suspension into a beaker and let it stand for 30 hours, take out the suspended part and add N-methylpyrrolidone to it to dilute until the aggregates are all dispersed. ...

Embodiment 3

[0034] A method for producing graphene, realized by the following scheme: accurately take 0.25g of highly oriented graphite powder, and uniformly disperse it in 320mL tetramethylurea by mechanical stirring to form a graphite suspension, and divide the graphite suspension into After 4 parts, each part is packed into a PTFE ball mill jar with a volume of 100mL together with agate balls coated with EVA with a thickness of about 1.2mm on the surface, and agate balls wrapped with EVA on the surface and highly oriented graphite The weight ratio between the powders is about 4500:1, and four polytetrafluoroethylene ball milling tanks equipped with agate balls coated with EVA on the surface and suspensions of highly oriented graphite powder are symmetrically placed in the planetary mill at 350 rpm The rotating speed ball milled for 50 hours. Pour the ball-milled graphite suspension into a beaker and let it stand for 24 hours, take out the suspended part and add tetramethylurea to it fo...

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Abstract

The invention discloses a method for producing graphene, which comprises the step that: graphite powder is subjected to wet ball milling in organic solvent, wherein the surface tension of the organic solvent is 30 to 45 mNm-1; and the surface of a milling ball used for the wet ball milling is wrapped with soft polymer. After adopting the scheme, the method selects and uses a ball milling process widely applied in the actual production to peel off graphite. Compared with the prior art, the method has the following advantages that: 1) the damage of rigid collision between the milling balls to the graphite crystal structure is effectively reduced by adopting the soft polymer to wrap the hard milling balls, meanwhile, the soft polymer has stronger friction force with the graphite so as to greatly improve the milling and peeling effects, and the yield of the graphene can reach 30 to 50 weight percent; 2) the adopted ball milling process is easier to expand the scale and implement industrialized production; 3) except little defect at the edge part, the graphene crystal structure is kept intact; and 4) the graphene product has even thickness which is kept between 1 and 2 carbon atom layers.

Description

technical field [0001] The invention relates to a preparation method of the latest two-dimensional nano-carbon material-graphene, belonging to the technical field of nano-materials. Background technique [0002] Graphene is a new two-dimensional planar carbon material with atomic thickness discovered in 2004 (Novoselov, K.S. et al.Science 306, 666 669 (2004)), and its thickness is defined as 1-10 carbon atoms between. Studies have shown that when the thickness of the graphite layer is less than 10 carbon atomic layers, the graphite sheet exhibits a different electronic structure from ordinary three-dimensional graphite, which is called graphene. When the thickness exceeds 10 carbon atomic layers at most, the graphite sheet no longer exhibits a series of special properties of graphene, and becomes no different from ordinary three-dimensional graphite sheet, and is no longer graphene. According to the thickness of graphene, that is, the number of carbon layers, it can be div...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/04C01B2204/02C01B31/0469B82Y40/00B82Y30/00C01B32/19
Inventor 陈国华赵卫峰赵立平
Owner HUAQIAO UNIVERSITY
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