Method for transferring graphene films

Abstract

The invention provides a method for transferring graphene films, which comprises the steps of coating polymer on the graphene films and curing, forming a covalent binding between the polymer and the graphene films, and directly transferring the graphene films from a substrate. Compared with the traditional method, the method for transferring graphene films provided by the invention is simple and easy to operate, and the graphene films can be adhered to the substrate in the way of covalent binding, so that the graphene films are unlikely to fall off; and furthermore, the fresh surfaces of the graphene films can be taken as the constituent parts of the functional devices, so that the effect of the functional devices can be effectively improved and the method is suitable for industrialization.

Description

technical field [0001] The invention relates to a method for preparing and transferring graphene materials, and belongs to the field of new material preparation. technical background [0002] Graphene is the thinnest but also the hardest nanomaterial in the world, its hardness surpasses that of diamond. The thermal conductivity of graphene is as high as 5300 W / m K, which is higher than that of carbon nanotubes and diamonds. Its electron mobility exceeds 15000 cm2 / V s, which is higher than that of carbon nanotubes. The resistivity is only about 10 -6 Ω cm, lower than copper, the material with the smallest resistivity in the world. Since Andre Heim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, used adhesive tape to peel off graphene films from oriented graphite in 2004, graphene films have gradually become One of the most attractive materials in the field of new materials. Graphene is essentially a transparent and good conduc...

AI Technical Summary

Problems solved by technology

In the traditional graphene film transfer process, there are three problems as follows: First, before the transfer, the graphene film is exposed to the air for a long time, causing the air-contacting surface to be polluted by suspended particles in the air, while the traditional The transfer method is to use this polluted surface to make devices; second, the traditional transfer method transfers the graphene film to a hard substrate, and the bonding force between graphene and the substrate is only van der Waals force, resulting in graphite The olefin film is easy to fall off; Third, the traditional transfer method requires complicated steps. In the process of transferring from the metal substrate to the required substrate, there are too many types of materials used, and it is easy to get stuck on the graphite during the transfer process. Introduce pollution to the surface of graphene, and easily lead to the destruction of the crystal structure of the graphene film