Graphene production process

Abstract

The invention belongs to the technical field of graphene preparation, in particular to a graphene production process. The graphene production process includes the following steps of: using natural flake graphite or artificial graphite as raw materials, adding oxidant for oxidation reaction to obtain graphite oxide, then adding intercalation agent for intercalation reaction, and conducting suctionfiltration to reaction solution after the intercalation reaction is finished to obtain intercalated graphite after drying; grinding and sieving the prepared dried intercalated graphite by using a grinding device to obtain expandable graphite; dispersing the obtained expandable graphite in sonication solvent to conduct ultrasonic treatment and realize primary stripping; conducting microwave irradiation treatment of the obtained graphite of ultrasonic primary stripping through graphene two-stage microwave production equipment to realize final stripping. The graphene production process has the advantages that with the ultrasonic and microwave radiation to strip the graphite twice, the graphene obtained by stripping is highly fluffy; with graphene finished products not containing organic functional groups, quality of graphene products is improved.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, in particular to a graphene production process. Background technique [0002] Graphene is an ultra-thin material with a single carbon atom thickness arranged in a two-dimensional honeycomb structure. Graphene has rich physical properties, with a specific surface area of ​​2600m2 / g; excellent mechanical properties, breaking strength up to 42N / m2, tensile strength and elastic modulus of 130GPa and 1.0TPa respectively, and elastic extension up to 20%; thermal conductivity Well, it is as high as 5300W / (m·K) at room temperature; the transparency is high, and the light absorption rate is only 2.3%. At the same time, graphene also has excellent electrochemical properties, and its electron mobility exceeds 15000cm2 / (V·s) at room temperature, which is higher than that of carbon nanotubes. Graphene has become a research hotspot because of its unique structure and excellent performance. [0...

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Problems solved by technology

[0003] The preparation methods of graphene are mainly divided into three categories: the first redox graphene method, which is simple to operate and can be mass-produced, but the prepared graphene contains a large number of functional groups, which increases the defects of graphene and reduces the graphene. performance; the second type of method is chemical vapor deposition, which can prepare high-quality single-layer graphene but cannot be mass-produced on an industrial scale; the third is the mechanical exfoliation method, which can be industrialized on a large scale, but the The quality of the graphene is not high

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