A kind of method for preparing graphene

Abstract

The invention relates to a method for preparing graphene. The method includes: pretreating a layered compound to remove impurities among layers and allow flaky orientation to form among the layers, loading catalysts to structures among the layers, adding a carbon source, and performing catalyzing under a high-temperature condition to obtain the graphene. Compared with the prior art, the method has the advantages that the carbon source is wide in source, the method is simple in process, low in cost and capable of effectively protecting the structure of the graphene, and the industrial production of the graphene can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a method for preparing graphene. Background technique [0002] In 2004, two scientists from the University of Manchester in the United Kingdom discovered graphene using the method of micromechanical exfoliation, and won the Nobel Prize in Physics in 2010. Graphene is a single-atom-thick flat plate structure with sp2-bonded carbon atoms. In theory, it has a perfect hexagonal network structure and exhibits excellent electronic stability, thermal conductivity, optical properties, and mechanical properties. Since the discovery of graphene, due to its excellent performance and huge market application prospects, it has triggered a research boom in the fields of physics and material science. Graphene is currently the thinnest and hardest nanomaterial. It also has properties that many ordinary materials do not have, such as good light transmission, high thermal conductivity, hi...

AI Technical Summary

Problems solved by technology

[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, reduce the size of the graphene after peeling off, and make the crystal size of the graphene product obtained is small, making it difficult to obtain large size and high Quality graphene, whether it is mechanical ball milling or mechanical jet milling, is sacrificing the size and lattice integrity of graphene; in addition, the strong pressure of the grinding medium will cause the graphite layer structure to become more compact, which will lead to the exfoliation effect reduce the grinding time, resulting in long grinding time and high cost; moreover, the current grinding and production of graphene is intermittent, and the stripped graphene cannot be screened out in time while the graphite is stripped, so it is difficult to carry out continuous and stable mass production , it is difficult to realize the industrial production of graphene