Thin-layer low-defect micro-nano graphene and preparation method thereof

Abstract

The invention provides micro-nano graphene. The sheet layer edge of the graphene is graphene oxide; and other parts, except the edge position, of a graphene sheet layer are graphene. According to the preparation method, the micro-nano graphene with a specific structure is obtained, and the graphene has a micron-scale large sheet diameter and a nano-scale thinness, and has the same structure and characteristics as graphene oxide at the edge of the sheet layer. The micro-nano graphene provided by the invention has a graphene structure with less than 5 layers of lamellas, has lower surface functional groups and defect degree and higher graphene quality, and is thin-layer low-defect graphene. According to the preparation method provided by the invention, preparation is carried out through mechanical stripping, weak oxidation and chemical shallow insertion technologies; and the method is simple in process, low in cost and more suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of graphene, and relates to a micro-nano-scale graphene and a preparation method thereof, in particular to a thin-layer low-defect micro-nano-scale graphene and a preparation method thereof. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, with sp 2 The carbon six-membered ring two-dimensional crystal structure formed by hybridization is the basic unit for constructing other dimensional carbon materials. Its basic structural unit is the most stable benzene six-membered ring in organic materials, with a theoretical thickness of only 0.335nm and a two-dimensional material with a thickness of only one carbon atom, which is the thinnest two-dimensional material among known materials discovered so far. Since Geim et al first prepared grap...

AI Technical Summary

Problems solved by technology

[0003] However, although graphene has excellent performance, in practical applications, graphene still has many problems and restrictive factors. As far as its preparation method is concerned, the graphene prepared by the existing physical exfoliation method is mostly in water system and oil. It is prepared under the system, and there is a graphene drying step, which leads to serious graphene folding back, graphene characteristics are not significant, and nano-scale graphene with a smaller thickness cannot be obtained; while graphene prepared by redox has more surface functional groups , and the defect is high

Limit the scope of application of graphene

The laboratory-level CVD preparation process is too cumbersome, the conditions are harsh, the output rate is low, the cost is high, and the production efficiency is affected. It is not suitable for mass production, and it is difficult to realize large-scale industrial production and popularization and application.

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