A method for large-scale pulverization of large-diameter graphene

Abstract

The invention provides a method for preparing large-flake-diameter graphene by scale crushing. Graphite powder is used as a raw material and is putted in abrasive disks, wherein the surface of the fixed abrasive disk and the surface of the movable abrasive disk are wear-resisting ceramic mirror surfaces; the graphite powder is stripped layer by layer and is sliced under the action of mutual reverse staggered motion of the abrasive disks with the mirror surfaces, so the reduction of an internal radial direction of a graphite layer is effectively prevented; by introducing ultrasonic high-frequency vibration in the abrasive disks, graphite sheets are subjected to laminated tearing and further the large-flake-diameter graphene is obtained. According to the method, technical effects of continuous production, cleanness and environmental protection are realized, and industrial continuous production of the graphene is pushed; furthermore, the process of shearing, peeling, and ultrasonic uniform dispersion in the abrasive disks is finished at one step, so that a bedding structure of the graphene is retained to the maximum extent, and a graphene material can be continuously and stably prepared; the surface integrity and the topological symmetry of the graphene are not damaged, so that the quality of a graphene product is guaranteed.

Description

technical field [0001] The invention relates to the field of nanometer material processing, in particular to a method for preparing large-diameter graphene through large-scale pulverization. Background technique [0002] Graphene is a planar carbon nanomaterial composed of a layer of carbon atoms. It is the thinnest known two-dimensional material, with a thickness of only 0.335nm. It is composed of a hexagonal lattice. The carbon atoms in graphene are connected by σ bonds, endowing graphene with extremely excellent mechanical properties and structural rigidity. Moreover, in graphene, each carbon atom has an unbonded p-electron. These p-electrons can move freely in the crystal, and the speed of movement is as high as 1 / 300 of the speed of light, which endows graphene with good conductivity. Optically, graphene is almost completely transparent, absorbing only 2.3 percent of light. Graphene has unique mechanical, optical and electrical properties, and graphene has very broad ...

AI Technical Summary

Problems solved by technology

Although this method avoids the use of high-temperature state and high-risk gas, the size of graphene is limited by the use of large-size graphite as a raw material in this method, and it is impossible to obtain a large-size graphene film that can be directly applied

The reducing agent of this method is poisonous hydrazine or hydrazine hydrate, which not only has high production cost, but also pollutes the environment and affects the health of operating workers.

[0007] In summary, the current pretreatment of graphite with strong oxidants will graft polar groups on the surface of the prepared graphene, endangering human health and causing environmental pollution, destroying the lattice integrity of graphene, and reducing the quality of the system. conductivity

The exfoliation efficiency of graphene powder prepared by mechanical exfoliation method is low, the dust pollution in the production process is serious, and the continuous production of graphene cannot be realized, and because the powder making machines currently in use do not consider retaining the radial size of graphite, mechanical The size of graphite prepared by exfoliation is relatively small