Preparation method of large-area few-layer graphene and dispersion solution thereof

Abstract

The invention belongs to the technical field of preparation of graphene materials, and particularly relates to a preparation method of large-area few-layer graphene and a dispersion solution thereof. The preparation method comprises the following steps: uniformly mixing natural crystalline flake graphite and mixed acid composed of concentrated nitric acid and concentrated sulfuric acid in a reactor, adding oxydol, reacting while stirring, then filtering, washing with water, and drying to obtain layered graphite; immersing the layered graphite in a volatile acid water solution, and sequentially filtering, washing with water and drying to obtain acidified layered graphite; and adding the acidified layered graphite into solvent containing surfactant, and performing ultrasonic exfoliation to obtain the graphene dispersion solution. The preparation method is simple in preparation process and convenient to operate; and the prepared graphene and graphene dispersion solution are superior in quality. The preparation method is wide in application range, environment-friendly, energy-saving and suitable for large-scale production.

Description

Technical field: [0001] The invention belongs to the technical field of graphene material preparation, in particular to a method for preparing large-area few-layer graphene and its dispersion. 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. These methods hav...

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. These methods have their advantages and disadvantages: mechanical exfoliation method is not suitable for large Large-scale industrial production of graphene; chemical vapor deposition method and epitaxial growth method have disadvantages such as complicated process, harsh conditions, low yield and high cost, which limit their large-scale industrial production and application of graphene; although redox method is currently the Large-scale preparation of graphene is a relatively common method, but the traditional Hummer method has high energy consumption and is easy to pollute the environment, and the obtained graphene has many defects and is prone to aggregation, and the formed graphene dispersion has poor stability and the size of graphene smaller

Images