Preparation method of graphene

Abstract

The invention belongs to the field of two-dimensional nano materials and preparation thereof, and particularly relates to a preparation method of graphene. The method is characterized by comprising the following steps: adding a reducer into a graphite oxide dispersion liquid, heating to react, and carrying out centrifugal separation to obtain the graphene, wherein the reducer is sodium diphenylamine sulfonate. The method has the advantages of more sufficient reduction of graphite oxide, easy product separation and simple purification process. In the preparation process, no stabilizer or dispersant is added, and the obtained graphene contains fewer impurity elements; and the invention has the characteristics of controllable process, short period, atmospheric conditions, simple equipment and excellent graphene properties, is suitable for industrial production, and has wide application prospects in the technical fields of catalysis, energy transfer and storage, sensors and the like.

Description

technical field [0001] The invention belongs to the field of two-dimensional nanometer materials and their preparation, in particular to a preparation method of graphene. Background technique [0002] Graphene is sp 2 Single-atom-layer planar crystals formed by hybridized carbon atoms arranged in a honeycomb grid in two-dimensional space are the basic units of fullerenes, carbon nanotubes and graphite. Since Professor A. Geim of the University of Manchester and Since its first successful preparation by its collaborators, graphene, as a rapidly rising star in the field of material science and condensed matter physics, has attracted many scientists to study various aspects of it. Studies have shown that the theoretical specific surface area of ​​graphene is as high as 2630m 2 / g, the Young's modulus is 1100Gpa, the breaking strength is 125Gpa, the mechanical strength is 1060Gpa, the thermal conductivity is 5000W / m·k, and the electron mobility at room temperature is 15000cm 2...

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation methods of graphene mainly include: mechanical exfoliation method (K.S.Novoselov, et al, Science, 2004, 306, 666-669), chemical vapor deposition method (A. Reina, et al, Nano Lett., 2009, 9, 30-35), epitaxial growth method (P.W.Sutter, et al, Nat. Mater., 2008, 7, 406-411), chemical redox method (D.Li, et al, Nat. Nanotechnol., 2008, 3, 101-105); these methods have their own advantages and disadvantages. The graphene obtained by mechanical exfoliation has high purity and good conductivity, but the yield is low and the mixed product of graphene is difficult to obtain. Separation; high-quality, large-area graphene can be prepared by chemical vapor deposition, and single-layer graphene can be prepared by epitaxial growth, but these two methods require high temperature and high pressure, harsh experimental conditions, complex operating processes, and high production costs ; Compared with the first three methods, the chemical redox method has the advantages of simple operation process, mild experimental conditions, and low production cost, and is more suitable for large-scale production

[0004] The reducing agent of graphene prepared by the chemical reduction of graphene oxide reported in current literature mainly contains: hydrazine hydrate (Stankovich S, et al, J Mater Chem, 2006,16,155- 158), hydroquinone (G.X.Wang, et al, Carbon, 2009, 47, 1359-1364) and sodium borohydride (J.F.Shen, et al, Chem. Mater., 2009, 21, 3514-3520), etc.; The disadvantage of hydrazine hydrate and hydroquinone is that they are highly toxic and cannot meet the needs of environmental protection; sodium borohydride has low reduction efficiency due to its easy hydrolysis

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