Preparation method of multilayered graphene with ultrahigh conductivity

Abstract

The invention relates to a preparation method of multilayered graphene with ultrahigh conductivity. The preparation method comprises specific steps as follows: copper foil is placed in a CVD (chemical vapor deposition) reactor; protective gas and a gaseous carbon source are introduced into the CVD reactor for reaction; the CVD reactor is closed, a first graphene layer grows on the copper foil and is covered with a first high-conductivity powder layer; the CVD reactor is opened, a second graphene layer grows on the first high-conductivity powder layer continuously and is covered with a second high-conductivity powder layer; the operation including introduction of the protective gas and the gaseous carbon source for reaction, continuous growing of the second graphene layer on the first high-conductivity powder layer and covering the second graphene layer with the second high-conductivity powder layer is repeated 6-12 times; a third graphene layer grows on the second high-conductivity powder layer continuously, and the multilayered graphene can be obtained after the copper foil is removed. The multilayered graphene is good in power characteristic, higher in energy density and good in electrochemical stability and has good application prospect in the aspect of preparation of conductive materials.

Description

technical field [0001] The invention relates to a graphene composite material, in particular to a method for preparing multilayer graphene with ultrahigh electrical conductivity. Background technique [0002] Since its discovery in 2004, graphene has become a dazzling new star in the nanometer world, which has attracted great attention of scientific researchers. Graphene is a carbonaceous material with a single-layer two-dimensional honeycomb lattice structure densely packed with sp2 hybridized carbon atoms. It is the basic unit of other graphite materials. Its morphology is a sheet structure similar to thin paper. , the single-layer thickness is only 0.335nm, which is the thinnest two-dimensional material found in the world so far. Graphene has excellent comprehensive properties: its theoretical strength is 125GPa, which is 100 times stronger than steel; its elastic modulus can reach 1.0TPa, comparable to that of carbon nanotubes; its thermal conductivity is 5300W / (m K), w...

AI Technical Summary

Problems solved by technology

However, the graphene oxide prepared in the prior art mainly uses graphite flakes as a raw material, and is mainly prepared by the Hummers method or an improved Hummers method. The prepared graphene material not only has a large number of defects on the surface, but is also easy to agglomerate, unstable in performance, The actual conductivity is poor and the function is single, which limits the wide application of graphene