High-pressure large-scale graphene preparation method and application thereof in electromagnetic shielding

Abstract

The invention discloses a high-pressure large-scale graphene preparation method and application thereof in electromagnetic shielding. Graphene oxide gel is used as a precursor, a biocatalyst material is added, and magnetic stirring pre-reduction is performed after ultrasonic oscillation treatment to obtain a pre-reduction solution formed by mixing graphene oxide and a biocatalyst; a reducing material is taken as a secondary reducing agent and a doping agent, simple pressure cooker cooking and high-pressure and high-temperature reaction are adopted, and after graphene oxide is subjected to secondary reduction, the target material is prepared on a large scale, so that the preparation method has the advantages of simplicity, safety, high yield, low cost, easiness in batch production, no pollution and the like; and meanwhile, the prepared graphene material also has good water dispersibility, and can be used for preparing conductive ink and preparing a uniform graphene electrode film with high conductivity.

Description

technical field [0001] The invention relates to the field of novel electronic materials, in particular to a high-pressure mass-preparation method for graphene and its application in electromagnetic shielding. Background technique [0002] Graphene is a new type of carbon material composed of sp2 hybridized carbon atoms on a two-dimensional plane and has a single-layer sheet structure. Because GN has a single atomic layer structure, it has many excellent properties that ordinary carbon materials do not have in electricity and optics. Its surface area can reach 2675m2 / g, and its maximum conductivity is 106S / cm. And GN has excellent mechanical properties, its tensile strength and elastic modulus are 125GPa and 1.1TPa respectively, therefore, graphene is widely used in energy storage materials, sensor materials, biomaterials, conductive inks, semiconductor materials, electronic components, electromagnetic compatibility , electromagnetic shielding and other fields have broad ap...

AI Technical Summary

Problems solved by technology

[0006] To prepare single-layer graphene, but there are problems such as time-consuming and laborious, extremely low yield, and the size of the obtained graphene is very small, and it is extremely difficult to form a uniform electrode, which obviously does not have the possibility of industrial production

[0007] (2) Graphene electrode film is prepared by chemical vapor deposition method, epitaxial growth method, etc. This method can prepare graphene film with better uniformity, but both chemical vapor deposition method and epitaxial growth method have higher requirements on equipment requirements, and the prepared graphene electrode film is thin and has a small area, making it difficult to apply on a large scale

[0010] However, the existing redox method electrode materials and / or their preparation methods still have many deficiencies. For example, although the composite materials generated by the redox method are easy to prepare uniform electrodes, toxic reduction agents such as hydrazine hydrate are often used in the reduction process. The use of DMF and NMP and other volatile solvents that are easy to pollute the environment will cause great damage to the environment; large-scale use is not recommended

At the same time, the use of solvent heat requires the flammable organic solvent to be exposed to high temperature and high pressure conditions, which has a certain risk of explosion and has high requirements for equipment and operation.