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Method for producing graphene by voltaic arc negative pressure

A technology of graphene and electric arc, applied in the direction of graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high working environment requirements, long time consumption, high risk, etc., reduce the number of replacement graphite rods, reduce production costs, risk reduction effect

Inactive Publication Date: 2018-04-24
HEILONGJIANG HUASHENG GRAPHITE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the arc center temperature of the existing arc method for preparing graphene is high. Although the synthesized graphene has a high degree of crystallization, few defects, good electrical conductivity and thermal stability, only helium gas is used for protection when preparing graphene. The disadvantage of gas is that the conductivity of inert gas is poor, and a high current of 1500-3000A is required to prepare graphene by discharge, which consumes high power, requires high working environment, and is highly dangerous. The graphene prepared by low current has a large size and layers At the same time, the graphite rods of the arc method are only 100-400mm long. After each preparation, graphite rods need to be added manually, which takes a long time and the preparation rate is low. Raw materials cannot be fully utilized, which wastes manpower and increases cost of production

Method used

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  • Method for producing graphene by voltaic arc negative pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The first step, lengthening graphite rod 1 is put into cathode propelling device 2, adjusts prolonging graphite rod 1 in cathode propelling device 2, makes the distance between the prolonging graphite rod 1 in cathode 14 and the short graphite rod 13 in anode 12 The constant distance is 1-3 mm to ensure the stability of the preparation current and voltage, and the quality of the prepared graphene is uniform.

[0013] In the second step, vacuumize 3 to extract the air in the vacuum cavity 11, and then clean the pipeline with hydrogen and helium 5 to remove residual air in the pipeline.

[0014] In the third step, the gas 4 is flushed into the vacuum cavity 11, and the pressure value of hydrogen and helium 5 reaches -2×10 -5 MPa, the negative pressure environment meets the pressure required for graphene preparation.

[0015] The 4th step, open arc discharge device, the electric current of regulating current discharge 6 is 140A, and arc discharge device discharges, forms ...

Embodiment 2

[0019] The steps are the same as in Example 1, and the pressure value in the third step is changed to -1.85×10 -5 MPa, the current of the fourth step is changed to 170A, and the graphene product quality is the same.

Embodiment 3

[0021] The steps are the same as in Example 1, and the pressure value in the third step is changed to -1.57×10 -5 MPa, the electric current of the 4th step is changed into 200A, and graphene product quality is identical, and the graphene monolayer thickness 0.355nm that the method for the present invention prepares, size 100~20nm, conductivity 1000~2000s / m, as image 3 The number of layers of graphene shown is distributed between 1 and 3 layers. The above is only an implementation of the feasible embodiments of the present invention. The changes in the range of current and air pressure values ​​made according to the above embodiments are all included in this technical solution. within the scope of protection.

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Abstract

The invention discloses a method for producing graphene by voltaic arc negative pressure. An lengthened graphite rod is put into a cathode propulsion device, the constant distance between the lengthened graphite rod in a cathode and a short graphite rod in an anode is 1-3mm, a pipeline is cleaned with a hydrogen gas and a helium gas, the interior of a vacuum cavity is filled with a hydrogen gas and a helium gas at the ratio of 1:1 until the pressure value is -1x10<-5> to -2x10<-5>MPa, a voltaic arc electric discharge device is turned on, after a current is 140A-200A, electric discharging is performed, and a voltaic arc is formed between the anode graphite rod and the cathode graphite rod. The method provided by the invention has the characteristics that the voltaic arc negative pressure isused to prepare the graphene, the negative pressure environment satisfies the pressure required for the preparation of the graphene, besides the helium gas, injected gases also add the hydrogen gas with good conductivity, so that the current of preparation of the graphene and the production dangerousness are reduced, energy sources are saved, the filling amount of the hydrogen gas and the heliumgas and the number of replacement of the graphite rod are reduced, the preparation rate is high, raw materials can be fully utilized, work is saved, labor is saved, and the production costs are reduced.

Description

technical field [0001] The invention relates to a graphene production process, which is a production process flow for producing graphene by an electric arc method. Background technique [0002] At present, the arc center temperature of the existing arc method for preparing graphene is high. Although the synthesized graphene has a high degree of crystallization, few defects, good electrical conductivity and thermal stability, only helium gas is used for protection when preparing graphene. The disadvantage of gas is that the conductivity of inert gas is poor, and a high current of 1500-3000A is required to prepare graphene by discharge, which consumes high power, requires high working environment, and is highly dangerous. The graphene prepared by low current has a large size and layers At the same time, the graphite rods of the arc method are only 100-400mm long. After each preparation, graphite rods need to be added manually, which takes a long time and the preparation rate i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/04C01B2204/22C01B2204/32
Inventor 李强单立龙李厚福高悦
Owner HEILONGJIANG HUASHENG GRAPHITE CO LTD
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