A kind of method and graphene precursor of internal mixer exfoliation preparation graphene precursor

Abstract

The invention provides a method for preparing a graphene precursor by exfoliating an internal mixer and the graphene precursor. After soaking the graphite in the aqueous dispersion of the excess intercalation agent for a long time, the sugar material is used as the bonding and peeling carrier, and the viscous sugar material is sheared and stretched by the internal mixer to make the graphite in the sugar material Under the action of bonding, the graphene precursor is indirectly stretched and sheared and peeled by the viscous sugar material, which provides a mild shearing method and effectively overcomes the direct action of the huge mechanical shear force in the mechanical peeling process in the prior art Based on the technical defects of graphene and then destroying the layered structure of graphene, the chemical reaction in the prior art is avoided at the same time to destroy the graphene structure, and the technical effects such as high product quality and less pollution to the environment are achieved. The precursor prepared by the invention has stable properties and is easy to exfoliate into graphene.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a method for preparing a graphene precursor by exfoliating an internal mixer and the graphene precursor. Background technique [0002] Graphene is a planar film composed of carbon atoms with sp2 hybrid orbitals forming a hexagonal honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. In 2004, Andre Geim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully used tape to peel off graphite, confirming that single-layer graphene can be obtained, and won the 2010 Nobel Prize in Physics. Graphene is currently the thinnest and hardest material in the world. Its thermal conductivity is higher than that of carbon nanotubes and diamonds. At room temperature, its electron mobility is also higher than that of carbon nanotubes or silicon crystals, and its resistivity is lower than that of copper or silver. The material ...

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Problems solved by technology

Because strong oxidants such as sulfuric acid, nitric acid, and perchloric acid are used as intercalation agents in this scheme, and graphite intercalation compounds are obtained through chemical reactions, the graphene obtained by this method often has defects, which affect the conductivity of graphene and cause Environmental pollution limits the large-scale industrial application of this method

[0007] According to the above, although graphene is obtained through repeated grinding by mechanical means, due to the effect of grinding compressive stress, the grinding impact will cause certain damage to the graphite lattice, and the grinding will exert pressure on the graphite, resulting in a huge impact on the exfoliated graphite. This impact force will cause structural defects in the graphene layer, which can easily cause lattice defects in the graphene layer structure and reduce the quality of the graphene after peeling. In addition, in order to improve the efficiency of mechanical peeling, the graphite is intercalated before mechanical treatment. Chemical reactions occur during layer treatment, which easily destroys the graphene structure, pollutes the environment, is not easy to prepare high-quality graphene, and is difficult to achieve large-scale industrial production

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