Graphene powder gas-phase physical stripping method and produced graphene

Abstract

The invention relates to the technical field of graphene production, and concretely relates to a graphene powder gas-phase physical stripping method. The method comprises the following steps: selecting high-purity flaky graphite as a raw material for producing graphene, mixing the flaky graphite with a ball-milling stripping medium, feeding the mixture into a ball mill, adding polyvinylpyrrolidone, polyvinyl alcohol and oleamide, carrying out ball-milling stripping under the protection of inert gas, and separating the graphene sheets subjected to ball-milling stripping through airflow classification under the protection of the inert gas after stripping is finished. Graphene production is completed through a physical method, the graphene sheets exist in a complete powder form, the storage and use environment is not limited, the industrial production cost is low, and graphene can be more widely applied to all walks of life.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to a gas-phase physical stripping method of graphene powder and the produced graphene. Background technique [0002] Graphene is a two-dimensional crystal, which is composed of carbon atoms arranged in a hexagonal shape and connected to each other to form a carbon molecule with a very stable structure; as the number of connected carbon atoms continues to increase, this two-dimensional carbon molecule The plane keeps expanding, and the molecules keep getting bigger. Single-layer graphene is only one carbon atom thick, that is, 0.335 nanometers, which is equivalent to the thickness of one 200,000th of a hair. There are nearly 1.5 million layers of graphene in graphite with a thickness of 1 mm. Graphene is the thinnest material known, and has the advantages of extremely high specific surface area, super-strong electrical conductivity and strength. The existence of the abo...

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Problems solved by technology

[0003] However, the methods that can be industrialized in the prior art are mainly realized by redox method and CVD (chemical vapor deposition method). The redox method is relatively simple to produce, but it is easy to cause waste liquid pollution, and the produced graphene may have structural defects. ;

[0004] Through the chemical vapor deposition method, a large-area, continuous, transparent, and high-conductivity few-layer graphene film can be made, which is mainly used for the anode of photovoltaic devices, and the energy conversion efficiency can be as high as 1.71%; compared with indium tin oxide materials Compared with the components made, it is about 55.2% of its energy conversion efficiency; but the disadvantage is that the production is difficult and the production cost is high, and it is difficult to make graphene widely used; and graphene can be obtained by repeated sticking and tearing with adhesive tape. The friction method, and then the CVD method, both have low efficiency or high production costs, which is not conducive to the popularization of graphene applications.

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