Method for preparing graphene

A graphene and atmosphere technology, applied in the field of graphene preparation, can solve problems such as unsolved problems, and achieve the effects of easy operation and high product quality

Inactive Publication Date: 2012-06-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem of controllable synthesis of graphe

Method used

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Experimental program
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Embodiment 1

[0030] Embodiment 1, the preparation of the graphene of dendritic morphology

[0031] Commercial 25um thick copper foil (purity 99.8%) was ultrasonically cleaned with deionized water, ethanol and acetone and dried in an oven. The tungsten substrate loaded with the above copper foil was placed in the middle of a clean quartz tube, and the quartz tube was placed Put it into the electric furnace, make the middle part of the quartz tube located in the central area of ​​the electric furnace, then pass 120 sccm of argon gas into the quartz tube, and stop feeding the argon gas after 5-10 minutes. Turn on the vacuum pump to start vacuuming. When the pressure in the reaction chamber is 3 to 10 Pa, turn off the vacuum pump, and then feed the mixed gas of 100 sccm of argon and 300 sccm of hydrogen until the pressure in the reaction chamber is consistent with the external atmospheric pressure, and then stop feeding the argon. Only use 300sccm hydrogen as the carrier gas. After 10 minutes ...

Embodiment 2

[0033] Embodiment 2, the preparation of petal-shaped graphene

[0034] According to the same preparation method as in Example 1, only the following changes were made: the tungsten substrate was replaced by a molybdenum substrate, and when the temperature in the central area of ​​the electric furnace reached 1080°C, the amount of methane and argon gas introduced remained unchanged, and the hydrogen flow rate was adjusted to 20 sccm. The time is 7 minutes.

[0035] The scanning electron micrograph of the obtained product is as Figure 6 As shown, it can be seen from the figure that a petal-shaped substance is uniformly distributed on the copper surface, and the substance is graphene.

Embodiment 3

[0036] Embodiment 3, the preparation of gear-shaped graphene

[0037] According to the same preparation method as in Example 1, only the following changes were made: the hydrogen flow rate was adjusted to 60 sccm during growth, and the reaction time was 15 min.

[0038] The scanning electron micrograph of the obtained product is as Figure 7 As shown, it can be seen from the figure that the gear-like substance is uniformly distributed on the copper surface, and the substance is graphene.

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Abstract

The invention discloses a method for preparing graphene. The method comprises the following steps of: after heating a substrate loaded with a copper metal layer to a bulk phase melting point and above the bulk phase melting point of copper in the flowing anaerobic and anhydrous atmosphere, introducing a carbon-containing compound into a system to perform chemical vapor deposition to obtain the graphene on the surface of the copper metal layer after the deposition. According to the method, the graphene with various shapes is prepared by introducing inert gases under a liquid state copper catalyst. The method is easy and convenient to operate and high in quality of products, and can be used for large-scale production. The shapes of the graphene can be regulated and controlled by regulating a concentration ratio of the inert gases to carbon-containing substances and hydrogen.

Description

technical field [0001] The invention relates to a method for preparing graphene. Background technique [0002] Graphene, the monoatomic layer of graphite, is a two-dimensional structure in which carbon atoms are arranged in a honeycomb shape, and is also the basic unit of other low-dimensional carbon materials such as fullerenes and carbon nanotubes. According to the number of layers, graphene can be divided into single-layer graphene, double-layer graphene, and few-layer graphene. Graphene has been studied for a long time, but the truly independent and stable graphene was obtained by Geim et al. from the University of Manchester in the United Kingdom by stripping highly oriented graphite through adhesive tape. Since the discovery of graphene, due to its excellent performance and huge application prospects, it has triggered a research boom in the fields of physics and material science. However, the problem of controllable synthesis of graphene materials with specific morph...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/186
Inventor 刘云圻耿德超武斌陈建毅黄丽平薛运周郭云龙于贵
Owner INST OF CHEM CHINESE ACAD OF SCI
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