Preparation method of graphene

A graphene, graphene solution technology, applied in graphene, nano-carbon and other directions, can solve the problems of long reaction time and low yield

Inactive Publication Date: 2012-05-23
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

The graphene synthesized by this method has high purity, but the reaction time is relatively long, and the yield is only 1% to 5%.

Method used

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  • Preparation method of graphene
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  • Preparation method of graphene

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preparation example Construction

[0019] see figure 1 , the preparation method of the graphene of an embodiment comprises the steps:

[0020] Step S101, providing expandable graphite. The expandable graphite is expandable graphite that complies with the national standard GB / T 10698-1989, and generally refers to natural crystalline graphite that can instantly expand into a worm-like shape when exposed to high temperature after special treatment. The expandable graphite used in this embodiment has an average diameter of 300-500 μm and a purity of 99-99.5%.

[0021] Step S102, heating the expandable graphite under a protective atmosphere to obtain expanded graphite after thermal exfoliation. In this embodiment, the expandable graphite is mixed with protective gas (2%~7%H 2 and 93% to 98% Ar), heated to 800°C to 1200°C for 10s to 60s (seconds) to expand the expandable graphite, and then perform thermal exfoliation to obtain expanded graphite. Of course, N 2 and other protective gases. In addition, the expand...

Embodiment 1

[0030] A kind of preparation method of high-purity graphene, its technological process is as follows:

[0031] (1) Provide expandable graphite with an average diameter of 300 μm and a purity of 99%;

[0032] (2) The expandable graphite is passed into a mixed protective gas (5% H 2 and 95% Ar), heated to 800°C for 60s, and formed expanded graphite after thermal exfoliation;

[0033] (3) The expanded graphite (25mg) in (2) is joined in 250ml, and concentration is in the sodium dodecylbenzene sulfonate solution of 5mg / ml, after ultrasonic 30min, leave standstill 12h, ultrasonic stripping forms graphene solution;

[0034] (4) Centrifuge the graphene solution in (3) for 30 minutes, collect the supernatant, filter, wash repeatedly with deionized water and ethanol, and finally dry in a vacuum oven at 80°C for 2 hours to obtain graphene crude product.

[0035] (5) Put the crude graphene product in (4) into a 1500W microwave reactor and heat for 60s to remove water molecules and sur...

Embodiment 2

[0037] A kind of preparation method of high-purity graphene, its technological process is as follows:

[0038] (1) Provide expandable graphite with an average diameter of 400 μm and a purity of 99.5%;

[0039] (2) The expandable graphite is fed into the mixed gas (5%H 2 and 95% Ar), heated to 1200°C for 10s to form expanded graphite;

[0040] (3) Add the expanded graphite (25mg) in (2) to 500ml, in the cetyltrimethylammonium bromide solution with a concentration of 50mg / ml, after ultrasonic for 30min, let it stand for 24h, and ultrasonically exfoliate to form graphene solution;

[0041] (4) The graphene solution in (3) is centrifuged for 30min, the supernatant is collected, filtered, washed repeatedly with deionized water and ethanol, and finally dried at 80°C for 2h in a vacuum oven to obtain graphene crude product.

[0042] (5) Repeat the operations of (3) to (4) for the centrifuged precipitate to increase the yield of the crude graphene product.

[0043] (6) Put the crud...

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Abstract

The invention relates to a preparation method of graphene, comprising the following steps of: heating expandable graphite in protective atmosphere, and thermally stripping to obtain expanded graphite; dissolving the expanded graphite into solution containing a surfactant, and ultrasonically stripping to obtain graphene solution; centrifuging, filtering, washing and drying the graphene solution in sequence so as to obtain a crude graphene product; and performing a microwave heating treatment to the crude graphene product to obtain the graphene. The preparation method of the graphene has the advantages of lower cost and higher purity.

Description

【Technical field】 [0001] The invention belongs to the technical field of organic semiconductor materials, and in particular relates to a preparation method of graphene. 【Background technique】 [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004, due to its unique structure and photoelectric properties, it has received widespread attention. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Such as: ①High strength, Young's modulus, (1,100GPa), breaking strength: (125GPa); ②High thermal conductivity, (5,000W / mK); ③High electrical conductivity, carrier transport rate, (200,000cm 2 / V·s); ④ high specific surface area, (theoretical calculation value: 2,630m 2 / g). In particular, its high conductivity, large specific surface properties and its two-dimensional nanoscale s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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