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Method for preparing graphene by using supercritical fluid

A technology of supercritical flow and graphene, which is applied in the production of bulk chemicals, etc., can solve the problems of difficulty in preparing high-quality graphene, difficulty in large-scale production, harsh preparation conditions, etc., and achieve easy operation, continuous preparation, easy to get effect

Active Publication Date: 2011-07-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods have experienced graphite oxidation process. Graphite powder introduces a large number of defects during oxidation, and cannot completely repair it during reduction, so it is difficult to prepare high-quality graphene.
Chinese patent application number: 200810113596.0, named "Method for preparing graphene by chemical vapor deposition" and Chinese patent application number: 200910023384.8, named "Method for growing graphene by 4H-SiC silicon surface epitaxial growth" can produce high-quality Graphene, but the preparation conditions are harsh, the operation is complicated, the equipment is expensive, and it is difficult to carry out large-scale production

Method used

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  • Method for preparing graphene by using supercritical fluid
  • Method for preparing graphene by using supercritical fluid
  • Method for preparing graphene by using supercritical fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] like figure 1 As shown, the preparation device involved in this embodiment mainly includes: an ultrasonic vessel 1, a pump 2, an autoclave 3, a valve 4, a cooling pool 5, and the like. The ultrasonic container 1, the pump 2, the autoclave 3, the valve 4, the cooling pool 5, etc. are sequentially connected through pipelines to form a circulation loop, and a discharge port 6 is provided between the ultrasonic container 1 and the cooling pool 5.

[0019] Ethanol was selected as the organic solvent, a certain amount of graphite powder and a certain amount of ethanol were added to the ultrasonic container 1, and the graphite powder was uniformly mixed in the organic solvent by ultrasonication, and the ultrasonication time was 10 minutes. The above-mentioned graphite powder mixed solution in the ultrasonic container 1 is pumped into the autoclave 3, the inlet of the pump 2 is connected with the outlet of the ultrasonic container 1 through a pipeline, and the outlet of the pum...

Embodiment 2

[0022] like figure 2 As shown, the preparation device involved in this embodiment mainly includes: an ultrasonic container 1, a pump 2, an autoclave 3, a valve 4, a cooling pool 5, an autoclave 6, a valve 7, a cooling pool 8, and the like. The ultrasonic container 1, pump 2, autoclave 3, valve 4, cooling pool 5, autoclave 6, valve 7, cooling pool 8, etc. are connected in sequence through the pipeline to form a circulation loop, and the ultrasonic container 1 and the cooling pool 8 are set up Outlet 9.

[0023] Choose dimethylformamide as the organic solvent, add a certain amount of graphite powder and a certain amount of dimethylformamide into the ultrasonic container 1, and make the graphite powder evenly mixed in the organic solvent by ultrasonic, and the ultrasonic time is 15 minutes. The above-mentioned graphite powder mixed solution in the ultrasonic container 1 is pumped into the autoclave 3, the inlet of the pump 2 is connected with the outlet of the ultrasonic contai...

Embodiment 3

[0026] like image 3 As shown, the preparation device involved in this embodiment mainly includes: ultrasonic container 1, pump 2, autoclave 3, valve 4, cooling pool 5, autoclave 6, valve 7, cooling pool 8, autoclave 9, valve 10, cooling Pool 11 et al. The ultrasonic container 1, the pump 2, the autoclave 3, the valve 4, the cooling pool 5, the autoclave 6, the valve 7, the cooling pool 8, the autoclave 9, the valve 10 and the cooling pool 11 are connected in sequence through pipelines. Feed inlet, cooling pool 9 is provided with feed outlet.

[0027] Select N-methylpyrrolidone as the organic solvent, add a certain amount of graphite powder and a certain amount of N-methylpyrrolidone into the ultrasonic container 1 from the feed port, and make the graphite powder evenly mixed in the organic solvent by ultrasonication. for 60 minutes. The above-mentioned graphite powder mixed solution in the ultrasonic container 1 is pumped into the autoclave 3, the inlet of the pump 2 is co...

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Abstract

The invention discloses a method for preparing graphene by using a supercritical fluid, which relates to the technical field of novel nano materials. The graphene is prepared by repeatedly and circularly treating and cooling graphite powder dispersion liquid. Graphene of less than eight layers, prepared by the method, accounts for 90-95 percent and single-layer graphene accounts for over 10 percent; meanwhile, continuous operation is performed, so that mass production can be realized, and the graphene has the advantages of simple process, nontoxicity and lower cost.

Description

technical field [0001] The invention relates to a method for preparing graphene in the technical field of new nanometer materials, in particular to a method for preparing graphene with a supercritical fluid. Background technique [0002] Since its discovery in 2004, graphene has been favored by researchers in the fields of physics and materials. Graphene is a two-dimensional honeycomb lattice structure carbonaceous material composed of a single layer of carbon atoms tightly packed. Although graphene is only one carbon atomic layer thick and is the thinnest known material, it is extremely strong and rigid. Graphene is also the material with the best conductivity known so far. In addition, graphene has many excellent properties: such as high Young's modulus, thermal conductivity, huge specific surface area and so on. Due to the special properties of graphene, it will have a wide range of applications in electronics, optics, magnetism, biomedicine, sensors, energy storage, e...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCY02P20/54
Inventor 胡国新
Owner SHANGHAI JIAO TONG UNIV
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