Preparation method of flawless graphene

Abstract

The invention belongs to the field of graphene preparation and discloses a preparation method of flawless graphene. The preparation method includes the steps of S1, dispersing graphite powder into a mixed solvent formed by ethanol and 30wt% hydrogen peroxide according to the volume ratio of (1-9):(1-9), adding polyvinyl pyrrolidone, and performing ultrasonic treatment for 2-3 hours; S2, placing the solution obtained after the ultrasonic treatment in S1 into a supercritical reaction kettle, performing reaction at 40-80 DEG C and 12-20MPa for 1-3 hours, taking out the reaction solution after thereaction, and performing ultrasonic treatment on the reaction solution for 2-3 hours; S3, performing first centrifugal separation on the solution obtained after the ultrasonic treatment in S2 at 6000-8000rpm, taking the upper solution, performing second centrifugal separation on the upper solution at 15000-20000rpm, and using ethanol to centrifugally wash the product; S4, drying the product obtained in S3 to obtain the flawless graphene. The preparation method has the advantages that the graphene prepared by the method is small in size and few in layers as compared graphene prepared by otherpreparation methods, and more importantly, the graphene is complete in lattice structure and is almost flawless.

Description

technical field [0001] The invention belongs to the field of graphene preparation, in particular to a method for preparing defect-free graphene. Background technique [0002] Graphene, as the first discovered 2D nanomaterial, has excellent electrical conductivity, mechanical properties and thermal conductivity, and is widely used in electronics, composite materials, energy storage and sensing. However, the existence of structural defects greatly reduces the theoretical properties of graphene, affecting the mechanical, conductive, and thermal properties of graphene. At present, the methods for exfoliating graphene mainly include liquid phase exfoliation, mechanical exfoliation, vapor deposition and electrochemical exfoliation. These methods will inevitably introduce defects in the process of preparing graphene, thereby reducing the performance of the sample. Therefore, it is still a great challenge to find a preparation technology that is green, pollution-free, easy to opera...

AI Technical Summary

Problems solved by technology

However, the existence of structural defects greatly reduces the theoretical properties of graphene, affecting the mechanical, conductive, and thermal properties of graphene.

At present, the methods of exfoliating graphene mainly include liquid phase exfoliation method, mechanical exfoliation method, vapor phase deposition method and electrochemical exfoliation method. These methods will inevitably introduce defects in the process of preparing graphene, thereby reducing the performance of the sample.

Images