Preparation method of graphene material

Abstract

The invention discloses a preparation method of a graphene material. The preparation method comprises the following steps of: dissolving powdered graphite into an organic solvent or water to form a suspension; placing the suspension in a container equipped with a gear group, wherein the gear operates at a low speed; taking out slurry for ultrasonic treatment, carrying out high-speed centrifuging so that graphite particles and graphite sheets which are not stripped and torn are precipitated at the bottom of a centrifuging tube through centrifugal action, and a solution on the upper layer comprises a single layer of graphene and multiple layers of graphene; and finally, concentrating and separating the solution on the upper layer to obtain the graphene powder or a stable graphene solution. According to the invention, continuous rotating and stirring of a graphite suspension are carried out by utilizing the gear group, the continuous meshing and tearing of the graphite sheet are carried out through gear teeth, thereby overcoming the disadvantages of multiple defects and low yield in a conventional mechanical method and preparing the graphene in high efficiency and high quality.

Description

technical field [0001] The invention relates to a preparation method of a graphene material, which belongs to the field of novel nanomaterials. Background technique [0002] Graphene, a two-dimensional carbon atom crystal, has excellent electrical and thermal conductivity and other exotic properties. How to quickly and efficiently prepare high-quality graphene and facilitate its application is the key direction for people to explore this new functional material. [0003] Graphene was originally discovered by tearing from graphite blocks through adhesive tape, and many preparation methods have been continuously extended. Including mechanical stripping method, thermal expansion graphite method, chemical vapor deposition method and so on. However, the existing methods also have their own shortcomings. For example, the tape tearing method needs many times to prepare a small amount of graphene, and it is troublesome to handle the graphene on the tape; the ball milling metho...

AI Technical Summary

Problems solved by technology

However, existing methods also have their own disadvantages

For example, the tape tearing method needs many times to prepare a small amount of graphene, and it is troublesome to handle the graphene on the tape; the ball milling method will introduce more defects in the graphene two-dimensional surface due to the impact of the ball; chemical methods, etc. It takes a long time to prepare, and the chemical method requires a variety of chemical reagents

Images