A kind of graphene material with ordered structure and preparation method thereof

Abstract

The invention provides a preparing method of a graphene material of an ordered structure. The preparing method includes the following steps that an oxidized graphene solution and an electrolyte water solution are mixed to obtain a mixed solution; the mixed solution obtained in the previous step is filtered to obtain the mixed graphene material under the action of an outside pressure field; the mixed graphene material obtained in the previous steps is freeze-dried, and in vacuum or under the protective atmosphere, the mixed graphene material obtained in the previous steps is annealed to obtain the graphene material of the ordered structure. By adopting electrolyte, the graphene structure is ordered and controllable on the basis of preparing the graphene macroscopic material; as the filtering mode is used, the arranging mode of graphene microchips can be adjusted. The arranging mode of graphene microchips in the assembling process can be effectively controlled to prepare the graphene macroscopic material in an adjusting mode, and the graphene macroscopic material of the ordered microstructure is obtained.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a graphene material with an ordered structure and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional crystal composed of carbon atoms with only one layer of atomic thickness. It is also the thinnest material and the strongest material currently in the application field. Excellent elasticity, the stretching range can reach 20% of its own size; it also has a huge theoretical specific surface area, stable physical and chemical properties, and excellent electrical conductivity. It is precisely because graphene materials have many excellent physical and chemical properties that they are widely used in energy storage materials, environmental engineering, and high-sensitivity pressure sensing. However, the applications in existing fields are still concentrated on graphene nanochips. . [0003] With the rapid development of science and te...

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Problems solved by technology

[0003] With the rapid development of science and technology and the high-level demand for graphene materials in various industries, in order to break through practical application barriers and meet industrial needs, only relying on graphene nano-chips stacked by single-layer carbon atom planar structure graphene and It cannot effectively solve the existing technical problems, so it is required to prepare a graphene macroscopic material with manipulability

[0004] The current research is mainly aimed at how to effectively obtain self-assembled macroscopically operable graphene materials from graphene dispersions. Commonly used methods such as freeze-drying, hydrothermal method, solvent volatilization self-assembly, cross-linking assembly method, etc., these types of methods Graphene macroscopic materials can be obtained quickly and effectively, but the arrangement of graphene microsheets inside the material cannot be effectively controlled, and macroscopic materials with an ordered microstructure cannot be obtained

[0005] In the existing research, the weak magnetism of graphene oxide is used to arrange and fix the graphene under the action of a magnetic field, and then control the arrangement of graphene, but the weak magnetism of graphene oxide makes this method imprecise and unable to mass Manufacturing (ASC Nano, 2014, 5, 4640-4649); there are also research groups trying to use the order of the liquid crystal phenomenon of graphene oxide solution to control the arrangement of graphene microsheets during the assembly process, but the separation of graphene from the solution In the process, many unknown factors will affect the alignment of the original liquid crystal (Nat.Commun.2:571doi:10.1038 / ncomms1583(2011).)

Therefore, the existing assembly technology is only a single or extensive assembly of graphene nanomaterials, and it is difficult to control the assembly and arrangement sequence of graphene nanosheets, resulting in a three-dimensional interconnected disordered network structure formed during the material assembly process. As a result, macroscopic materials cannot exert optimal mechanical and physical and chemical properties

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