A kind of low structural defect graphene production method

Abstract

The invention provides a low-structure-defect graphene production method. The method comprises the following steps: purifying graphene oxide which contains a functional group and impurities; and carrying out reduction on the purified graphene oxide. The purifying step comprises: mixing the graphene oxide which contains the functional group and the impurities, a complexing agent and an acidic solution to form a mixed solution; and carrying out ultrasonic oscillation on the mixed solution, and filtering to obtain purified graphene oxide. The reduction step comprises: enabling the purified graphene oxide to sequentially pass through reaction areas which are vertically arranged at different temperatures and under different pressure intensities with the aid of the effect of gravity and reactingthe purified graphene oxide so as to obtain graphene. By the purifying step, the graphene oxide can be effectively separated from impurity ions, and the thoroughness of purification of the graphene oxide can be improved; and the graphene can be prepared at different temperatures and under different pressure intensity areas, metal and non-metal impurities in the graphene can be removed, and SP3 hybrid defects caused in a preparation process of the graphene oxide are repaired.

Description

technical field [0001] The invention relates to the technical field of new material preparation, and more specifically, relates to a method for producing graphene with low structural defects. Background technique [0002] In 2004, physicists Andre Heim and Konstantin Novoselov of the University of Manchester first separated single-layer graphene from graphite by mechanical exfoliation, and studied its quasi- Particle properties, and field effect properties. This discovery quickly triggered a graphene research boom all over the world. In just a few years, the research and application of graphene have developed vigorously. [0003] Graphene is a two-dimensional honeycomb network structure composed of carbon atoms. It is a surface material composed of a single layer of carbon atoms that can be directly peeled off from graphite. The arrangement of carbon atoms in graphene is the same as that of graphite, which belongs to the compound hexagonal crystal structure. 2 The hybridi...

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Problems solved by technology

On the one hand, the crystal structure of graphene prepared by redox method is easily destroyed in the process of oxidative intercalation, which leads to the increase of internal defects in graphene, which greatly affects the performance of graphene; On the one hand, there are still a large amount of metal and non-metallic impurities in the graphene produced by the redox method, which further affects the large-scale development and application of graphene; , high energy consumption, and inability to produce continuously will also affect the large-scale production of graphene

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