Technology and method for preparing solution used for preparing graphene in liquid phase

Abstract

The invention provides a technology and method for preparing solution used for preparing graphene in a liquid phase, comprising the following six steps of: firstly, directly mixing water and alcohol in predetermined proportion, thus the solution used for preparing graphene in the liquid phase can be obtained; secondly, dispersing graphite powder into the solution, thus graphite dispersion is obtained; thirdly, treating by adopting ultrasonic cavitation or jet flow cavitation; fourthly, standing the treated solution, and taking the solution at the upper layer; fifthly, carrying out high-speed centrifugal separation on the solution at the upper layer; and sixthly, collecting supernate at the upper layer after the high-speed centrifugal separation is carried out, thus stable graphene dispersion is obtained. By adopting the solution directly mixed by the water and the alcohol in the invention, the graphene can be prepared in non-toxic pollution-free green solvent with low boiling point, equipment investment is less, raw materials are available, production safety is high, operation is simple and convenient, environmental protection can be realized, yield is considerable, reproducibility is good, and the technology and method provided by the invention are applicable to laboratory study and are also applicable to large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation process and method of a solution used for preparing graphene in a liquid phase, in particular to a technology for preparing graphene in a mixed solution of water and alcohol. The invention belongs to the technical field of graphene preparation. Background technique [0002] With its unique and excellent properties in physics, chemistry, electricity, mechanics, etc., graphene has shown broad application prospects in many fields such as new materials, new energy, and electronic components. However, in the long run, the most important prerequisite for the real large-scale application of graphene is to develop a low-cost, large-volume, and pollution-free graphene preparation technology. Similarly, the large-scale, low-cost, and pollution-free preparation technology of graphene is also one of the core issues about the basic research and industrial application of this material. [0003] Graphene was prepared for the f...

AI Technical Summary

Problems solved by technology

At present, the mainstream methods of graphene preparation belong to the category of chemical technology, mainly including substrate growth, substrate epitaxy, chemical vapor deposition and reduced graphene oxide. The first three methods show advantages in the application of electronic components, but there is temperature and pressure control. Severe conditions such as high requirements, high-quality substrates, difficulty in controlling the separation of graphene and substrates, etc., it is difficult to achieve the purpose of mass production of graphene, especially unable to meet the industrial application requirements of graphene materials

In addition, although the graphene oxide reduction method based on the liquid phase process is an effective way to prepare graphene in large quantities, the process is complicated, the conditions are not easy to control, and the preparation cost is high. The performance of reduced graphene oxide and pure graphene is There are still some differences in the reduction efficiency, and most of the chemical reagents used are toxic, which is difficult to meet the needs of low-cost green applications

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