Method for preparing graphene

A technology of graphene and ionic liquid, which is applied in the field of preparing graphene with carbon nanotubes as raw materials, can solve the problems of immature chemical vapor deposition, high corrosion, and low efficiency, and achieve high yield, mild reaction conditions, The effect of low energy consumption

Inactive Publication Date: 2009-11-11
PEKING UNIV
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Problems solved by technology

The mechanical exfoliation method and the thermal expansion graphite method have low efficiency and small output, which can only be limited to small-scale experiments in the laboratory
The chemical vapor deposition method is still very immature
Recently, scientists have prepared graphene with controllable structure on a large scale by oxidizing carbon nanotubes with potassium permanganate in concentrated sulfuric acid, but this method uses a large amount of highly corrosive concentrated sulfuric acid.

Method used

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Embodiment 1

[0022] Embodiment 1, the preparation of graphene

[0023] 20mg of carbon nanotubes were added in 200mg of 1-butyl-3-methylimidazolium tetrafluoroborate, ground in a mortar for 15 minutes to make the two evenly mixed, then 2ml of 6mol / L hydrochloric acid was added to the mixture, and After the temperature was stabilized at 50°C, 2ml of hydrogen peroxide was added and reacted for 0.1 hour. The black substance obtained was graphene.

[0024] After testing, the yield of graphene synthesized by the above method is about 85%.

Embodiment 2

[0025] Embodiment 2, the preparation of graphene

[0026] 2 mg of carbon nanotubes were added to 20 g of 1-butyl-3-methylimidazolium tetrafluoroborate, ground in a mortar for 15 minutes to mix the two evenly, then 5 ml of 6mol / L hydrochloric acid was added to the mixture, and After the temperature was stabilized at 60°C, 20 mg of potassium permanganate was added and reacted for 48 hours, and the obtained black substance was graphene.

[0027] After testing, the yield of graphene synthesized by the above method is about 90%.

Embodiment 3

[0028] Embodiment 3, the preparation of graphene

[0029] Add 2 mg of carbon nanotubes to 10 g of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, grind in a mortar for 30 minutes to mix the two evenly, and add 5 ml to the mixture after stabilizing the temperature at 50°C Concentrated nitric acid was reacted for 2 hours, and the obtained black substance was graphene.

[0030] After testing, the yield of graphene synthesized by the above method is about 80%.

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Abstract

The invention discloses a method for preparing graphene, belonging to the technical field of material. The method prepares the graphene by the reaction of a carbon nano-tube and an oxidant in ionic liquid. Preferably, before reaction, the carbon nano-tube used as the reactive raw material is dispersed in the ionic liquid used as the reaction medium in a normal dispersion way (such as grinding, mixing, and the like.), subsequently the oxidant is added in the solution so as to carry out the reaction at certain reaction temperature and for a certain reaction time, thus obtaining the graphene. Preferably, the mass ratio of the carbon nano-tube to the ionic liquid is 1:10000-1:10; the reaction temperature is preferably within 0-300 DEG C; the reaction time preferably ranges from 0.1h to 48h; and the selection of the ionic liquid and the oxidant is wide. The method can be used for preparing the graphene and has the advantages of simple step, easy operation, suitable for large-scale industrial production, wide source of raw material, corrosion-free reaction medium, circular utilization of the medium, high yield, easy purification, moderate reaction condition, reaction at normal pressure and low energy consumption.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene by using carbon nanotubes as raw materials. Background technique [0002] Graphene is a new type of carbon material. As a newly discovered form of carbon, it has attracted extensive research interest in recent years. [0003] In graphene, carbon atoms are hybridized in the form of SP2, and each carbon atom is connected to three carbon atoms around it by covalent bonds to form a two-dimensional planar structure. The carbon atoms on the two-dimensional plane Unbonded P orbitals form large π bonds across the plane. The unique structure of graphene brings it a series of novel and special properties. Graphene has only one layer of carbon atoms on a flat surface and is the thinnest material ever discovered. Due to the perfect arrangement of carbon atoms on the two-dimensional plane, the carbon atoms are connected by very strong covalent bonds, so gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 李彦彭飞王金泳
Owner PEKING UNIV
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