Method for preparing graphene by using liquid alkali metal

Abstract

The invention provides a method for preparing graphene by using a liquid alkali metal, the liquid alkali metal is subjected to a reduction reaction with carbon dioxide gas in a high-temperature environment to generate carbon elementary substance (namely the graphene) to prepare the graphene, the preparation process is simple and rapid, pollution is avoided, the requirements on the preparation environment and equipment are low, the cost is low, the control process can be controlled to stop in a controllable manner at any time; the production content of the graphene is controlled, and the production quality and the production speed are controllable.

Description

【Technical field】 [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a method for preparing graphene by using liquid alkali metal. 【Background technique】 [0002] Due to its unique structure and photoelectric properties, graphene has become a research hotspot in the fields of carbon materials, nanotechnology, condensed matter physics and functional materials. Graphene is a new type of nanomaterial with the thinnest, highest strength, and strongest electrical and thermal conductivity found so far. Graphene is called "black gold" and is the "king of new materials". Its theoretical specific surface area is as high as 2630m2 / g. It can be used in effect transistors, electrode materials, composite materials, liquid crystal display materials, sensors, etc. But the main problem encountered in the process of using graphene is that it cannot be mass-produced at present. [0003] At present, there are mainly two methods for the produ...

AI Technical Summary

Problems solved by technology

But the main problem encountered in the process of using graphene is that it cannot be mass-produced at present

[0003] At present, there are mainly two methods for the production and preparation of graphene. One method is the mechanical exfoliation method, which uses the friction and relative motion between the object and graphene to obtain a thin layer of graphene material. The efficiency and purity of obtaining graphene are extremely low, and the result is very unsatisfactory; the second method is the redox method, which is simple in operation and high in yield, but the product quality is low, and the prepared graphene is prone to agglomeration and difficult to disperse , due to the presence of van der Waals interactions, graphene with a high specific surface area tends to form irreversible agglomerates, and even redeposits to form graphite, which affects the mass production of graphene and also limits its application.

In addition, the reducing agent used in the chemical redox method is toxic and causes certain pollution to the environment.