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Method for preparing graphene through carrying out ultrasonic stripping on graphite

A technology of exfoliating graphite and ultrasonic exfoliation, which is applied in the direction of graphene and nano-carbon, can solve problems such as introduction, graphene quality degradation, and failure to meet application requirements, and achieve low preparation costs, easy operation control, and industrialized mass production. Effect

Inactive Publication Date: 2013-08-21
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can improve the efficiency of preparing graphene, impurities are inevitably introduced into the product, which reduces the quality of graphene and cannot meet its application requirements in the optoelectronic field.

Method used

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  • Method for preparing graphene through carrying out ultrasonic stripping on graphite
  • Method for preparing graphene through carrying out ultrasonic stripping on graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Graphite powder and intercalation agent were put into N-methylpyrrolidone (NMP) solvent according to the mass ratio of 1:0.5. The size of the graphite powder is 45 μm, and the concentration of the intercalation agent in the mixed solution is 2 mg / mL. The intercalant is naphthalene. The obtained mixed solution was subjected to an ultrasonic stripping reaction at 30° C., and the stripping reaction time was 90 minutes. The product obtained by the reaction is subjected to centrifugation, the centrifugation speed is 1000 RPM, and the centrifugation speed time is 30 minutes. After centrifugal separation, remove the supernatant, which is the graphene dispersion. The graphene dispersion is vacuum filtered, and the pore diameter of the filter membrane is 0.1 μm.

Embodiment 2

[0039]Put the graphite powder and the intercalation agent into the dimethylformamide (DMF) solvent according to the mass ratio of 1:0.2. The size of the graphite powder is 45 μm, and the concentration of the intercalation agent in the mixed solution is 2 mg / mL. The intercalating agent is phenanthrene. The obtained mixed solution was subjected to an ultrasonic stripping reaction at 30° C., and the stripping reaction time was 90 minutes. The product obtained by the reaction is subjected to centrifugation, the centrifugation speed is 1000 RPM, and the centrifugation speed time is 30 minutes. After centrifugal separation, remove the supernatant, which is the graphene dispersion. The graphene dispersion is vacuum filtered, and the pore diameter of the filter membrane is 0.1 μm.

Embodiment 3

[0041] Put the graphite powder and the intercalation agent into the 1,2-dichlorobenzene (ODCB) solvent according to the mass ratio of 1:1. The size of the graphite powder is 45 μm, and the concentration of the intercalation agent in the mixed solution is 2 mg / mL. The intercalating agent is phenanthrene. The obtained mixed solution was subjected to an ultrasonic stripping reaction at 30° C., and the stripping reaction time was 90 minutes. The product obtained by the reaction is subjected to centrifugation, the centrifugation speed is 1000 RPM, and the centrifugation speed time is 30 minutes. After centrifugal separation, remove the supernatant, which is the graphene dispersion. The graphene dispersion is vacuum filtered, and the pore diameter of the filter membrane is 0.22 μm.

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Abstract

The invention belongs to the technical field of functional material preparation, and relates to a novel method for preparing graphene through carrying out ultrasonic stripping on graphite. The method comprises the following steps: uniformly mixing graphite powder and an intercalator in certain proportion in an organic solvent, carrying out stripping on the obtained mixture a certain time by using an ultrasonic water bath, carrying out centrifugal separation on the obtained object, and filtering the obtained product so as to obtain a graphene material. In the traditional process for preparing graphene through ultrasonic stripping, in the invention, a series of compounds such as naphthalene and the like are taken as an intercalator for preparing graphene. Compared with the prior art, the graphene prepared by using the method disclosed by the invention has the advantages of high quality, excellent performances, less defects, low impurity content, and the like; and especially the method is a physical process, thereby ensuring the perfect performances of the graphene. In addition, the method disclosed by the invention has the advantages of simpleness, easiness for operation, low preparation cost of products, high concentration of synthesized graphene dispersion liquid, and uneasiness for gathering, and has a good application prospect in the photoelectric field of graphene materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a method for preparing graphene by ultrasonically exfoliating graphite. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. The real challenge in the current graphene research field is how to produce high-quality graphene thin layers to enable large-scale applications. On the one hand, it is to prepare high-quality samples with single layer, large size, and excellent electrical properties, so as to be used in the performance research of graphene and the application field of microelectronic devices; on the other hand, it is to study how to realize the macro-preparation of graphene. There are two main methods of synthesizing graphene: mechanical methods and chemical methods. Mechanical methods include micromechanical separation method, epitaxial method and heating SiC method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 许家胜张杰
Owner BOHAI UNIV
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