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Method for preparing graphene through liquid-phase stripping method

A technology of liquid phase exfoliation and graphene, which is applied in the field of graphene preparation by liquid phase exfoliation, can solve the problems of wide size distribution, small two-dimensional size, and low quality of graphene, so as to save preparation time, increase interlayer spacing, Favorable peeling effect

Inactive Publication Date: 2015-04-08
SHENZHEN MINDKING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) The two-dimensional size of the exfoliated graphene is relatively small, and the size distribution range is wide, and the quality of graphene is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 of the present invention: a kind of method that liquid-phase exfoliation method prepares graphene comprises the following steps:

[0032] S1, using the instantaneous high temperature expansion method to treat one or more of natural graphite, expandable graphite and expanded graphite, that is, heating at 900°C for 10 seconds, the volume after expansion is about 300 times the original;

[0033] S2, disperse the expanded graphite in an aqueous solution containing 0.1mg / mL sodium cholate, the concentration of graphite in the dispersion is 0.1mg / mL, and perform ultrasonic treatment with an ultrasonic power of 250W and an ultrasonic time of 4 hours to make it Preliminary refinement; then centrifuged at 1500rpm, dried in a vacuum oven for 12 hours, and set aside;

[0034] S3, add the dried graphite into 6mg / mL N-methylpyrrolidone solution containing stearic acid, configure the dispersion liquid with graphite concentration of 0.1mg / mL, and perform ultrasonic treatm...

Embodiment 2

[0036] Embodiment 2 of the present invention: a kind of method that liquid-phase exfoliation method prepares graphene comprises the following steps:

[0037]S1, using the chemical expansion method to expand one or more of natural graphite, expandable graphite and expanded graphite, that is, to combine one or more of natural graphite, expandable graphite and expanded graphite with chloride (such as chlorine NaCl), grind to make it evenly mixed, then add concentrated sulfuric acid, keep warm at 60°C for 24 hours, finally wash with pure water until neutral, dry for later use, the volume after expansion is about 300 times of the original;

[0038] S2, disperse the expanded graphite in an aqueous solution containing 0.1mg / mL sodium cholate, the concentration of graphite in the dispersion is 0.5mg / mL, and perform ultrasonic treatment, the ultrasonic power is 250W, and the ultrasonic time is 4 hours to make it Preliminary refinement; then centrifuged at 1500rpm, dried in a vacuum ove...

Embodiment 3

[0041] Embodiment 3 of the present invention: a kind of method that liquid-phase exfoliation method prepares graphene comprises the following steps:

[0042] S1, use the instantaneous high temperature expansion method to expand one or more of natural graphite, expandable graphite and expanded graphite, that is, heat at 500 ° C for 1 minute;

[0043] S2, disperse the expanded graphite in an aqueous solution containing 0.01 mg / mL sodium dodecyl sulfate or sodium dodecylbenzenesulfonate, the concentration of graphite in the dispersion is 0.01 mg / mL, perform ultrasonic treatment, and The power is 50W, and the ultrasonic time is 30 minutes to make it initially thin; then centrifuge at a speed of 1000rpm, dry in a vacuum oven for 5 hours, and set aside;

[0044] S3, add the dried graphite into N,N-dimethylformamide, configure a dispersion liquid with a graphite concentration of 0.01mg / mL, and perform ultrasonic treatment with an ultrasonic power of 50W and an ultrasonic time of 30 m...

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Abstract

The invention discloses a method for preparing graphene through a liquid-phase stripping method. The preparation method comprises the following steps: S1, performing expanding treatment on a graphite raw material through an expanding method; S2, dispersing the expanded graphite into an aqueous solution containing a surfactant to obtain a mixture, performing ultrasonic treatment on the mixture, centrifuging the mixture, and drying the mixture for later use; S3, adding the dried graphite into an organic solvent, a mixed solution of an organic solvent and a surfactant or a mixed solution of an organic solvent and substances with surface energy similar to that of the graphene, performing ultrasonic treatment and suction filtration, drying, and repeating the step S3 for 1-10 times, thereby obtaining graphene. Compared with the prior art, the method disclosed by the invention can be used for greatly shortening the ultrasonic treatment time, improving the stripping efficiency and obtaining high-quality graphene under low-power ultrasonic treatment.

Description

technical field [0001] The invention relates to a method for preparing graphene by a liquid phase exfoliation method, and belongs to the technical field of graphene preparation. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is the thinnest and hardest nanomaterial known in the world. It has high thermal conductivity, extremely low resistivity, and extremely fast electron migration. These excellent properties make graphene have bright application prospects in the fields of nanoelectronic devices, gas sensors, energy storage and composite materials. [0003] After research, it was found that there are many methods for preparing graphene, such as micromechanical exfoliation, chemical vapor deposition, oxidation-reduction method, and liquid or gas phase direct exfoliation method, among which the liquid phase exfoliation method has been widely used in recent years. [0004] However, there are still defec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 高慧俐涂铭旌陈锐强
Owner SHENZHEN MINDKING TECH
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