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Method for preparing graphene two-dimensional material through liquid-phase stripping

A liquid phase exfoliation, two-dimensional material technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of low yield, large pollution, complex process, etc., to achieve high yield, low price, process simple effect

Active Publication Date: 2017-05-17
北京华科讯能石墨烯新技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the existing graphene production method, such as low yield, heavy pollution, complex process, etc., to provide a liquid-phase graphene production method with low production cost, environmental friendliness, high output and suitable for industrial production. Method for preparing graphene by exfoliation

Method used

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  • Method for preparing graphene two-dimensional material through liquid-phase stripping

Examples

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Embodiment 1

[0030] A method for preparing a liquid phase exfoliated graphene two-dimensional material, the method is implemented through the following steps:

[0031] (1) Mix 5g of graphite powder, 500mL of water, and 500mL of isopropanol in a beaker with a capacity of 2L, submerge the cutter head of the emulsification cutter under the liquid surface, and keep the cutter head at 8000rpm in a water bath at 40°C. The mixture was cut for 2h.

[0032] (2) Put the mixed solution after step (1) into a cell disruptor, and in a water bath at 40° C., maintain a power of 800 W, and sonicate the mixed solution for 30 minutes.

[0033] (3) The emulsification and cutting step described in step (1) and the ultrasonic step described in step (2) are alternately performed on the mixed solution for a total of 5 rounds of alternation.

[0034] (4), centrifuge the mixed solution of step (3) at a rotating speed of 3000rpm for 15min, and collect the supernatant, which is the graphene dispersion. The precipit...

Embodiment 2

[0038] A kind of preparation method of the graphene two-dimensional material of liquid phase exfoliation, its method step is basically the same as embodiment 1, difference is, the ratio of feeding capacity of water and isopropanol is 3:7, the appearance of gained graphene is carried out Characterized, the average lateral dimension of graphene is between 0.1-3 μm, the thickness is between 1-20 nm, and the yield is 1%.

[0039] image 3 It is the characterization result of the liquid-phase exfoliated graphene in Example 2, which proves that the lateral dimension of the graphene is between 0.1 μm and 3 μm. image 3 (c) and (d) are transmission electron microscopy (TEM) images, which further confirm the above-mentioned lateral dimensions of graphene and its ultrathin characteristics.

Embodiment 3

[0041]A kind of preparation method of the graphene two-dimensional material of liquid phase exfoliation, its method step is basically the same as embodiment 1, and difference is that the ratio of water and isopropanol feed capacity is 7:3, and the morphology of gained graphene is carried out Characterized, the average lateral size of the graphene is between 0.1-3 μm, the thickness is between 1-20 nm, and the yield is 0.5%.

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Abstract

The invention provides a method for preparing a graphene two-dimensional material through liquid-phase stripping. The method comprises the following steps: (1) dispersing graphite into water and / or an organic solvent, maintaining the mixture temperature at 20-80 DEG C, alternatively preforming emulsified cutting and strong ultrasonic, wherein the graphene concentration in the mixture is 0.15-10g / L; (2) separating the product in the step (1) by use of a centrifuging method, taking the separated supernatant as the graphene dispersion liquid, wherein the centrifuging rate is 1000-6000rpm, and the centrifuging time is 5-30min. The commercial graphite with low price is used as the raw material, the organic solvent with good graphene dispersion property is used as the solvent for liquid-phase stripping, the ethanol, the isopropanol and other organic solvents are pollution-free, low in cost and recyclable; by use of the method of combining the emulsified cutting and the strong ultrasonic, the production time is short, the period is 6-20h, the method is simple, and the efficiency is high; the obtained graphene yield is high and can achieve 2%.

Description

technical field [0001] The invention belongs to the field of carbon material preparation, in particular to a method for preparing graphene. Background technique [0002] Graphene is an ultra-thin two-dimensional material. Due to its high specific surface area, excellent chemical and thermal stability, good electrical and thermal conductivity, and excellent mechanical properties, the material has been widely used. Research. With the continuous deepening of people's research on graphene materials, graphene will be commercially applied in many fields such as catalysis, electronics, and energy in the near future. In some important fields, such as electronic printing, conductive coatings, lithium-ion batteries, etc., a large amount of graphene that can be industrially produced will be required. For example, in lithium-ion batteries, graphene can be used as an electrode material with excellent performance and low price, and this electrode is produced by slurry coating, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04C01P2002/01C01P2002/72C01P2004/03
Inventor 杨树斌
Owner 北京华科讯能石墨烯新技术研究院有限公司
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