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Method for massively preparing graphene with excellent electrical conductivity and thermal stability

A technology of thermal stability and conductivity, which is applied in the field of graphene preparation, can solve the problems of many defects in graphene, restrict the research and further application of physical properties, poor conductivity and thermal stability, etc., and achieve excellent conductivity, low cost, The effect of improving crystallinity

Inactive Publication Date: 2011-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of oxidation, expansion and ultrasonic treatment in the chemical cleavage method leads to more defects, poor conductivity and thermal stability of the prepared graphene, which restricts its in-depth physical property research and further application.

Method used

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  • Method for massively preparing graphene with excellent electrical conductivity and thermal stability
  • Method for massively preparing graphene with excellent electrical conductivity and thermal stability
  • Method for massively preparing graphene with excellent electrical conductivity and thermal stability

Examples

Experimental program
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Effect test

Embodiment 1

[0025] device attached figure 1 .

[0026] With the natural flake graphite powder of size<30 μm as raw material, graphite powder average particle size is 20 μm in the present embodiment, adopts Hummer method ["Hummer method" please refer to document: Hummers W, Offman R.Journal of The American Chemical Society 1958,80 : 1339.] Obtain graphite oxide by oxidation for 1.5h; use hydrogen arc method to expand and cleavage graphite oxide: the anode 1 is a graphite disk with holes drilled on it, and the hole is filled with graphite oxide 2 as an anode, a diameter of 5-15mm The graphite rod is used as the cathode 3, and the reaction chamber is filled with a mixed gas of 700 Torr hydrogen 4 and argon 5 (volume ratio 1:9), and the cathode rod is adjusted at 50° to the upper surface of the anode disc, and discharge between the two poles (DC , 150A), graphite oxide expands and cleavages in an instant (<20s, about 10s in this example) to obtain exfoliated graphite; ultrasonically disperse...

Embodiment 2

[0029] device attached figure 1 .

[0030] Using natural flake graphite powder with a size of <30 μm as raw material, the average particle size of the graphite powder in this embodiment is 20 μm, and the graphite oxide is obtained by oxidation for 3 hours by the Hummer method; the graphite oxide is expanded and cleaved by the hydrogen arc method: the anode 1 is a graphite disk, and Drill a hole, fill the hole with graphite oxide 2 as the anode, a graphite rod with a diameter of 5-15 mm as the cathode 3, and fill the reaction chamber with a mixed gas of 700 Torr hydrogen 4 and argon 5 (volume ratio 1:9) , adjust the cathode rod and the upper surface of the anode disk to be 30°, discharge between the two poles (direct current, 150A), and the graphite oxide expands and cleavages in an instant (<20s, about 10s in this embodiment) to obtain exfoliated graphite; 40°C condition The exfoliated graphite was ultrasonically dispersed in NMP for 2 hours (power 600W); 20,000 rpm high-spee...

Embodiment 3

[0033] device attached figure 1 .

[0034] Using artificial graphite powder with a size of <30 μm as the raw material, the average particle size of the graphite powder in this example is 25 μm, and the graphite oxide is obtained by oxidation for 3 hours by the Hummer method; the graphite oxide is expanded and cleaved by the hydrogen arc method: the anode 1 is a graphite disk, on which Drill a hole, fill the hole with graphite oxide 2 as the anode, and a graphite rod with a diameter of 5-15 mm as the cathode 3, fill the reaction chamber with a mixed gas of 700 Torr hydrogen 4 and argon 5 (volume ratio 1:9), Adjust the cathode rod and the upper surface of the anode disc to be 30°, discharge between the two poles (direct current, 150A), and the graphite oxide will expand and cleavage in an instant (<20s, about 10s in this embodiment) to obtain exfoliated graphite; at 40°C Ultrasonic disperse the exfoliated graphite in NMP for 2 hours (power 600W); use 20,000 rpm high-speed centr...

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Abstract

The invention relates to technology for preparing graphene, in particular to a method for massively preparing high-quality graphene with excellent electrical conductivity and good thermal stability. The method comprises the following steps of: rapidly heating in an arc discharge mode under pressure atmosphere by adopting a cathode and an anode, expanding and splitting oxidized graphite to prepare exfoliated graphite, wherein the anode is the oxidized graphite prepared by a Hummer method, the total pressure of buffer gas is 50 to 1,000 torr and the discharging current is 50 to 300 amperes; uniformly dispersing the exfoliated graphite in solution of surfactant by adopting an ultrasonic method; and removing graphite which is not exfoliated completely and large-dimension thick graphite sheets by adopting a high-speed centrifugal method so as to prepare the high-quality graphene with excellent electrical conductivity and good thermal stability. The high-quality graphene with excellent electrical conductivity and good thermal stability can be prepared by simply controlling technological parameters, and the method has the characteristics of low cost, high product yield and mass production.

Description

Technical field: [0001] The present invention relates to the preparation technology of graphene, specifically a mass preparation method of high-quality graphene with excellent electrical conductivity and good thermal stability, which is suitable for macro-preparation of high-quality graphite with excellent electrical conductivity and good thermal stability alkene. Background technique: [0002] Graphene refers to a single layer of carbon atoms tightly packed into a two-dimensional honeycomb lattice structure, which is the basic unit for constructing other dimensional carbon materials (zero-dimensional fullerene, one-dimensional carbon nanotubes, three-dimensional graphite) . Due to its unique structure and excellent electrical, thermal, and mechanical properties, graphene is expected to be widely used in high-functional nanoelectronic devices, composite materials, catalytic materials, battery materials, field emission materials, gas sensors, and gas storage. Therefore, in ...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 成会明任文才吴忠帅高力波赵金平陈宗平刘碧录
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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