Low-impurity-content graphene preparation method

Abstract

The invention provides a low-impurity-content graphene preparation method which includes the steps: purifying graphene oxide containing functional groups and impurities; reducing the purified grapheneoxide. Purification includes the steps: mixing the graphene oxide containing the functional groups and the impurities, complexing agents and acid solution to form mixed liquid; performing ultrasonicoscillation and filtration on the mixed liquid to obtain purified graphene oxide. Reduction of the purified graphene oxide includes the step: enabling the purified graphene oxide to sequentially go through reaction areas with different temperature and pressure intensity to obtain graphene. The graphene oxide and impurity ions can be effectively separated by purification, graphene oxide purification thoroughness can be improved, the graphene is prepared in the areas with different temperature and pressure intensity, metal and nonmetal impurities in the graphene can be removed, and SP3 hybridization defects caused in the preparation process of the graphene oxide are repaired.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, more specifically, to a method for preparing graphene. Background technique [0002] At the beginning of the 21st century, nano-graphite sheets appeared in the scientific community. In 2006, two scientists from The University of Manchester in the United Kingdom cleverly prepared single-layer graphite through mechanical exfoliation, thus officially unveiling the veil of graphene as a material, and they also won the 2010 Nobel Prize in Physics prize. An ideal graphene material is composed of a single layer of graphite, and its carbon atoms are connected by sp 2 The hybrid orbitals are connected to form a stable six-membered ring structure. Studies have found that graphene materials have good various physical and chemical properties. For example: better electronic conductivity than metal gold, better mechanical strength than steel, super large specific surface area, good opt...

AI Technical Summary

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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