Graphene synthesis method

Abstract

The invention relates to a graphene synthesis method, and relates to the technical field of chemical synthesis methods. The invention especially relates to the graphene synthesis method. The graphene synthesis method is simple, and has the advantage of high product yield. The method comprises the following steps: (1) a reaction bottle is assembled in an ice-water bath; concentrated sulfuric acid is added; under magnetic stirring, a solid mixture of graphite powder and sodium nitrate is added; potassium permanganate is slowly added; the reaction speed is controlled; stirring is carried out under an ice bath condition and the reaction bottle is taken out; and a stirring reaction is carried out under room temperature; (2) an H2SO4 solution is used for diluting; after stirring, H2O2 is added and the solution is turned bright yellow; a stirring reaction is carried out, and centrifugation is carried out; and (3) a mixed solution of H2SO4 and H2O2, and HCl are used for washing repeatedly; and washing is carried out a few times with distilled water, such that a yellowish brown precipitate is obtained. the precipitate is graphite oxide.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis methods, in particular to a synthesis method of graphene. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a planar film composed of carbon atoms with sp2 hybrid orbitals forming a hexagonal honeycomb lattice, and a two-dimensional material with a thickness of only one carbon atom. [0003] The development of deep research on graphene is based on the successful preparation of monolayer samples. Therefore, the efficient preparation of graphene has become an important topic of widespread concern. At present, the preparation of graphene mainly includes four methods: mechanical exfoliation, epitaxial growth, epitaxy and chemical preparation. The mechanical exfoliation method is a method of exfoliating graphene sheets from the surface of bulk graphite crystals by mechanical force. In 2004, Geim et al. successfull...

AI Technical Summary

Problems solved by technology

Peter et al. have successfully obtained single-layer graphene using metal ruthenium as the substrate, but the graphene prepared by this method is often uneven in thickness, and the interaction between graphene and the substrate will affect the characteristics of graphene.

In comparison, although the first three methods can obtain higher-quality graphene, they are not conducive to large-scale preparation due to low preparation efficiency or harsh reaction conditions.