Preparation method of graphene dispersion liquid

Abstract

The invention provides a preparation method of graphene dispersion liquid. The preparation method of graphene dispersion liquid comprises the following steps of: preparing dispersion liquid by using a dispersing agent; then adding the graphene into the dispersion liquid to obtain graphene liquid; and carrying out ultrasonic, refining and dispersing treatment on the graphene liquid to obtain the graphene dispersion liquid. The graphene suspension liquid prepared by the method is good in dispersion fissility and even in grain size and can exist stably; the performance of the graphene is not affected; the size distribution of the few-layer graphene ranges from 300 nanometers to 1 micro; the thickness is 2-10 layers; and the stable storage period is more than three months under the room-temperature condition. By adopting the preparation method, the technical problems that the dispersibility of graphene nanometer materials is poor in water and normal-temperature organic solvent, and the like are solved, the compatibility and the dispersibility of graphene in various composite materials are improved, the application fields of graphene are greatly improved, and the unitization, the standardization and the micromation of the graphene application can be realized well.

Description

technical field [0001] The invention relates to the field of preparation of new nanometer materials, in particular to a method for preparing a graphene dispersion. Background technique [0002] Graphene is a new type of functional material discovered in this century. As a single-layer graphite sheet with a two-dimensional planar structure, it has excellent electrical properties, high thermal conductivity, high specific surface area, excellent mechanical properties, stable chemical properties, good corrosion resistance and antibacterial properties. It has broad application prospects in many fields, such as high-performance nanoelectronic devices, sensors, energy storage, and biomedicine. However, graphene nanosheets are very thin, and the van der Waals force between layers makes them easily agglomerated in a dry state, resulting in the stacking of graphene sheets and making it difficult to show the excellent properties of graphene. Moreover, graphene is composed of a large ...

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Problems solved by technology

Chinese patent (application number CN201110382012.1) discloses a method for preparing a highly stable graphene dispersion, which discloses grinding graphene and cyclodextrin, ultrasonic dispersion in water or common solvents to obtain highly stable graphene dispersion liquid, but the graphene material obtained by this method can clearly see the cyclodextrin molecules coated on the graphene surface in the transmission electron microscope photo, which affects the performance of its material

Dosa Parviz et al prepared a stable graphene suspension with pyrene and its derivatives, but the reagents used are not only difficult to volatilize, but also cost high, making it difficult to realize industrial applications

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