Method for preparing graphene by solution phase

Abstract

The invention discloses a method for preparing graphene by a solution phase, and relates to grephene. The invention provide a method for preparing graphene by the solution phase, which is low in cost, simple and easy to implement, low in device requirements, and beneficial to large-scale industrial production. The method comprises the following steps: (1) adding graphite powder to a tetrahydrofuran solution and obtaining graphite-powder tetrahydrofuran dispersion liquid by carrying out ultrasonic dispersion under the protection of nitrogen gas; (2) adding alkali metal and naphthalene to the graphite-powder tetrahydrofuran dispersion liquid obtained in the step (1), stirring under the protection of the nitrogen gas to obtain the mixed solution; (3) adding halogenated organic reagent to the mixed solution obtained in the step (2), and reacting under the protection of the nitrogen gas to obtain a solid product; and (4) washing and drying the solid product obtained in the step (3) to obtain the graphene powder. According to the method disclosed by the invention, liquid-phase chemical intercalation is carried out to the graphite by using the graphite powder as material; and then, the chemical modification of the halogenated organic reagent to the graphite is utilized for further opening the graphite, so that the graphene can be prepared by peeling the graphite under the non-ultrasonic action or the light ultrasonic action.

Description

technical field [0001] The invention relates to graphene, in particular to a method for preparing graphene in a solution phase. Background technique [0002] Graphene is a completely sp 2 A new type of two-dimensional carbon material with a thickness of only one atom composed of hybrid carbon atoms. Since it was first prepared in 2004, graphene has attracted widespread attention due to its unique structure and excellent properties, such as high specific surface area, high charge mobility, high strength and flexibility, high thermal conductivity, etc., and is expected to be used in energy materials. , nanoelectronic devices, composite materials, optoelectronic devices, sensors and other fields have been widely used. [0003] Graphene was originally isolated from highly oriented pyrolytic graphite by micromechanical exfoliation (Novoselov K S et al., Science, 2004, 306:666-669), but the yield of this method is small and it is only suitable for basic research. The low-cost a...

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Problems solved by technology

The graphene prepared by this method has a large area, but it often requires complex equipment, and the process conditions are harsh, making it difficult to prepare on a large scale

In addition to the above methods, silicon carbide epitaxial growth method (Berger C et al., Science, 312, 1191-1196), organic synthesis method (Zhi L J et al., J.Mater.Chem.18, 1472-1484) etc. are also applied The preparation of graphene, but these methods have their own disadvantages, such as complicated process, difficult to control, low output, high cost, etc.

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