Preparation method of high-conductivity graphene membrane

Abstract

The invention belongs to the technical field of preparation of graphene materials, and particularly relates to a preparation method of a high-conductivity graphene membrane. The preparation method comprises the following steps: preparing graphene oxide through an improved Hummer method in the presence of phosphoric acid protective agent, filtering through a polyester fiber filter membrane to obtain a graphene oxide membrane, and reducing the obtained graphene oxide membrane in a hydriodic acid-ethanol mixed solution to obtain the graphene membrane. The preparation method is simple and convenient to operate, has simple requirements for equipment and technology, and is cheap in raw materials and low in cost; and the prepared graphene membrane has few defects and high conductivity. The preparation method is easy to realize large-scale industrial production.

Description

Technical field: [0001] The invention belongs to the technical field of graphene material preparation, in particular to a method for preparing a high-conductivity graphene film. Background technique: [0002] Graphene is a carbon atom with sp 2 The hybridized orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. It has very excellent properties, for example, its specific surface area is as high as 2630m 2 .g -1 , sign mobility up to 200000cm 2 .v -1 .s -1 , Young's modulus up to 1.0TPa, thermal conductivity constant of 5000W.m -1 .K -1 , the optical transmittance is as high as 97.7%, and these properties of graphene make this new material attract widespread attention. [0003] At present, the preparation methods of graphene mainly include mechanical exfoliation method, chemical vapor deposition method, epitaxial growth method and chemical redox method, etc., all of which have their advanta...

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation methods of graphene mainly include mechanical exfoliation method, chemical vapor deposition method, epitaxial growth method and chemical redox method, etc., all of which have their advantages and disadvantages: due to the limitation of the exfoliation method, the mechanical exfoliation method is not suitable for large-scale Graphene is prepared industrially; chemical vapor deposition and epitaxial growth methods have disadvantages such as complicated process, harsh conditions, low yield, and high cost, which limit their large-scale industrial production and application of graphene; Cost, a more common method for large-scale preparation of graphene

However, the electrical conductivity of the graphene film prepared by the redox method is relatively low. On the one hand, the oxidation leaves defects on the graphene, which affects the transmission of electrons on the basal surface of the graphene sheet; on the other hand, the reduction cannot completely remove the graphite oxide The oxygen-containing functional groups on the alkene are removed, and after the oxygen-containing functional groups are removed, defects will be left on the graphene, resulting in a significant decrease in the electron transport performance, thereby reducing the conductivity of the prepared graphene film.

Images