Preparation method of high-quality graphene

Abstract

The invention relates to the technical field of graphene preparation, and particularly discloses a preparation method of high-quality graphene. The preparation method of the high-quality graphene comprises the following steps: mixing graphite powder with a stripping agent, an auxiliary stripping agent and an intercalation agent, then carrying out a reaction for 1-12 h, then carrying out a quenching reaction with water, and then washing and drying a reaction product to obtain the high-quality graphene. The method disclosed by the invention is safe and environment-friendly, simple and convenient to operate and low in production cost, and can be used for efficiently preparing high-quality graphene with few layers and few defects.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing high-quality graphene. Background technique [0002] In 2004, K.S. Novoselov and A.K. Geim of the University of Manchester in the United Kingdom prepared single-layer graphene by mechanical exfoliation and won the Nobel Prize in Physics in 2010. Graphene is made of sp 2 The hybridized carbon atoms connect three adjacent carbon atoms through σ bonds to form a regular hexagonal honeycomb planar structure, and the remaining p orbitals on each carbon atom will overlap with adjacent carbon atoms to form π bonds, so that Graphene has excellent electrical properties. Graphene has a large theoretical specific surface area (2630m 2 g -1 ), high carrier mobility (2×10 5 cm 2 v -1 the s -1 ), high Young's modulus (~1.0TPa), high thermal conductivity (~5000Wm -1 K -1 ), high light transmittance (97.7%) and high conductivity (>6×10 6 S / m). T...

AI Technical Summary

Problems solved by technology

However, liquid-phase exfoliation methods often suffer from poor exfoliation efficiency and low graphene concentrations (typically <0.1 mg / mL)

[0004] Chinese invention patent application number CN201610642713.7 discloses a method for preparing graphene powder at room temperature. The first step of the preparation method is to prepare graphite into a graphene precursor, and the second step is to place the graphene precursor in the solution and ultrasonically The graphene dispersion is prepared by exfoliation. This method requires two steps to prepare graphene, and the preparation steps are cumbersome, which is very unfavorable for the implementation of industrial production.

In addition, this method is also difficult to control the number of layers and defects of the prepared graphene; it is difficult to obtain graphene with few layers and few defects (D peak / G peak is below 0.3); high-quality graphene cannot be prepared