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Method for preparing graphene through arc-plasma continuous stripping

A technology of arc plasma and graphene, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of continuous and stable large-scale production, small two-dimensional size area, graphite lattice damage, etc., and achieve continuous Efficient preparation, low preparation cost and high cost effect

Active Publication Date: 2017-09-01
安康市顺祥炭素有限公司
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Problems solved by technology

[0006] Aiming at the defects that graphene prepared by mechanical exfoliation such as ball milling and jet milling is easy to cause graphite lattice damage, small two-dimensional size area, long time-consuming, high cost, and incapable of continuous and stable large-scale production, the present invention proposes a continuous exfoliation method using arc plasma A method for preparing graphene materials, thereby realizing continuous and stable batch preparation of graphene, which further promotes the mass production of graphene

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  • Method for preparing graphene through arc-plasma continuous stripping

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Embodiment 1

[0024] A method for preparing graphene material by arc plasma continuous exfoliation. Firstly, graphite is pulverized and exfoliated into graphite powder less than 5 μm through airflow milling, and then the graphite is accelerated through a cyclone by high-pressure airflow. At the nozzle of the cyclone, the inner wall of the nozzle and the Arc plasma is generated between the cathodes, and the multilayer graphite flow is instantly stripped into graphene under the action of the arc plasma jet, and completely dispersed graphene is obtained through the liquid nitrogen pool. The schematic diagram of the equipment is as follows figure 1 . The crushed graphite enters the cyclone and is driven by high-pressure gas to accelerate spirally, and it is ejected from the lower nozzle. The lower nozzle is an arc plasma anode with an inner diameter of about 20mm. The center of the lower nozzle is equipped with an arc plasma cathode. The cyclone is equipped with high-pressure water cooling. sys...

Embodiment 2

[0031] A method for preparing graphene material by arc plasma continuous exfoliation. Firstly, graphite is pulverized and exfoliated into graphite powder less than 5 μm through airflow milling, and then the graphite is accelerated through a cyclone by high-pressure airflow. At the nozzle of the cyclone, the inner wall of the nozzle and the Arc plasma is generated between the cathodes, and the multilayer graphite flow is instantly stripped into graphene under the action of the plasma jet, and completely dispersed graphene is obtained by cold extraction in a liquid nitrogen heat exchanger. The schematic diagram of the equipment is as follows figure 1 . The detailed operation steps include turning on the liquid nitrogen device, turning on the arc discharge, graphite crushing, graphene exfoliation and sample collection.

[0032] Among them, the jet mill pressure is controlled at 150KPa, and the gas velocity is controlled at 15m / s.

[0033] Among them, the cyclone outlet velocity ...

Embodiment 3

[0037]A method for preparing graphene material by arc plasma continuous exfoliation. Firstly, graphite is pulverized and exfoliated into graphite powder less than 5 μm through airflow milling, and then the graphite is accelerated through a cyclone by high-pressure airflow. At the nozzle of the cyclone, the inner wall of the nozzle and the Arc plasma is generated between the cathodes, and the multilayer graphite flow is instantly stripped into graphene under the action of the plasma jet, and completely dispersed graphene is obtained by cold extraction in a liquid nitrogen heat exchanger. The schematic diagram of the equipment is as follows figure 1 . The detailed operation steps include turning on the liquid nitrogen device, turning on the arc discharge, graphite crushing, graphene exfoliation and sample collection.

[0038] Among them, the jet mill pressure is controlled at 120 KPa, and the gas velocity is controlled at 20m / s.

[0039] Among them, the cyclone outlet velocity ...

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Abstract

The object of the invention is to provide a method for preparing graphene through arc-plasma continuous stripping. A specific technical scheme of the invention is as follows: the method comprises the steps of firstly, subjecting graphite to crushing and stripping by an air flow mill so as to obtain graphite powder, then, accelerating graphite through a cyclone by using high-pressure air flow, generating arc plasma between the internal wall of a jet nozzle of the cyclone and a cathode, instantly stripping multiple layers of graphite flow into graphene under the action of plasma jet, and carrying out cold extraction by a liquid-nitrogen heat exchanger, thereby obtaining monolayer or multilayer graphene with the lateral dimensions of 50nm to 500nm. The graphene has the characteristics of regular graphite layer, good crystal form, few defects, high purity, high yield and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene material preparation technology, and in particular relates to a method for preparing graphene by arc plasma continuous exfoliation. Background technique [0002] Carbon material is a common and special material on the earth. It can form diamond with higher hardness and soft graphite. In the past 20 years, carbon nanomaterials have been the frontier of scientific and technological innovation. In 1985, the rich Both Leene and the carbon nanotubes discovered in 1991 caused great repercussions, and a research boom arose. In 2004, Geim's group at the University of Manchester first obtained a single-layer or thin-layer two-dimensional atomic crystal-graphene by mechanical exfoliation. . The discovery of graphene has enriched the family of carbon materials, forming a complete system from zero-dimensional fullerenes, one-dimensional CNTs, two-dimensional graphene to three-dimensional diamond and graphit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B2204/30C01B2204/32
Inventor 陈庆王镭迪曾军堂
Owner 安康市顺祥炭素有限公司
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