High-conductivity graphene preparing method

A technology with high conductivity and graphene, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of complexity, product stability, many factors, and many steps, and achieve simple preparation methods and fewer layers , the effect of high conductivity

Inactive Publication Date: 2015-09-30
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention solves the problems that the existing graphene preparation method is difficult to mass-produce graphene with stable performance and high conductivity at low cost, and the existin

Method used

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment one: the preparation method of high-conductivity graphene comprises the following steps:

[0015] 1) Put the expandable graphite with an expandability of 51ml / g in a heating furnace and heat it to 650°C for 1min to obtain expanded graphite;

[0016] 2) A certain amount of expanded graphite is dispersed in acetone containing perfluoro-2-butyltetrahydrofuran with a surface tension less than 30 dyn / cm, the mass ratio of the expanded graphite to the organic solvent is 1:200, and the surface active agent The content is 0.01wt%. Under the condition of 25°C, the power of 121W was ultrasonically treated for 2.5h, and then the precipitate was removed by centrifugation at 890 rpm, and then the secondary precipitate was obtained by further centrifugation at 1100 rpm. High conductivity graphene was obtained after the secondary precipitate was dried.

Embodiment 2

[0017] Embodiment two: the preparation method of high-conductivity graphene comprises the following steps:

[0018] 1) Put the expandable graphite with an expandability of 60ml / g in a heating furnace and heat it to 800°C for 30s to obtain expanded graphite;

[0019] 2) A certain amount of expanded graphite is dispersed in tetrahydrofuran containing perfluorotriethylamine with a surface tension less than 30 dyn / cm, the mass ratio of the expanded graphite to the organic solvent is 1:250, and the content of the surface active agent is was 0.75wt%, at 70°C, ultrasonically treated with a power of 150W for 1.5h, then centrifuged at 650 rpm to remove the precipitate, and then further centrifuged at 2000 rpm to obtain the secondary precipitate, and the secondary High conductivity graphene was obtained after the precipitate was dried.

Embodiment 3

[0020] Embodiment three: the preparation method of high-conductivity graphene comprises the following steps:

[0021] 1) Put expandable graphite with an expandability of 80ml / g in a heating furnace and heat it to 700°C for 45s to obtain expanded graphite;

[0022] 2) Disperse a certain amount of expanded graphite in ethanol containing perfluoro-2-butyltetrahydrofuran with a surface tension less than 30 dyn / cm, the mass ratio of the expanded graphite to the organic solvent is 1:100, the surface active agent The content is 1wt%. Under the condition of 100°C, ultrasonic treatment with 200W power for 2h, and then centrifuged at 1000 rpm to remove the precipitate, and then further centrifuged at 3000 rpm to obtain the secondary precipitate, the secondary precipitate After drying, graphene with high conductivity was obtained.

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Abstract

The invention relates to a graphene preparing method, in particular to a high-conductivity graphene preparing method. The method is used for solving the problems that according to an existing preparing method, low-cost batched production can be difficultly achieved on the graphene with the stable performance and high conductivity, many steps exist, and factors influencing the product stability in the preparing process are multiple and complex. According to the scheme, the method includes the steps that firstly, expansible graphite is heated, and the expanded graphite is prepared; secondly, the expanded graphite is stripped off under the double action of organic matter with low surface tension and ultrasounds, impurities are removed through secondary centrifugation, secondary centrifugation sediment is dried, and high-conductivity graphene is obtained. The high-conductivity graphene preparing method has the advantages that the expanded graphite is stripped off under the double action of the organic solvent with the low surface tension and the ultrasounds, a redox reaction does not exist, impurities are not introduced, and compared with a traditional chemical preparing method, the generated graphene is few in defect, few in layer and higher in conductivity; a special device is not needed, the preparing method is simple and convenient, the stability of the performance of the prepared graphene is good, the performance is good, and industrial production is facilitated.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene with high conductivity. Background technique [0002] The carbon atoms in graphene and the surrounding carbon atoms form a stable benzene six-membered ring structure, which constitutes its basic unit. Graphene is the thinnest and hardest nanomaterial in the world. It is almost completely transparent and only absorbs 2.3% of light; its thermal conductivity is as high as 5300 W / (m K), which is higher than that of carbon nanotubes and diamonds. Electron mobility over 15000 cm 2 / (V s), which is higher than carbon nanotubes or silicon crystals, and the resistivity is only about 10 -6 Ω·cm, lower than copper or silver, is the material with the smallest resistivity in the world. Because of its extremely low resistivity and extremely fast electrons, it is expected to be widely used as a conductive material. At present, the main methods for preparing...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184C01B32/225
Inventor 孙友谊郑璐张文辉马骏晋日亚曹杨
Owner ZHONGBEI UNIV
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