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Preparation method of grapheme capable of dispersing in organic solvent

An organic solvent and graphene technology, which is applied in the field of preparation of graphene that can be dispersed in organic solvents, can solve problems such as hindering the application of graphene, excessive content, etc., and achieve excellent solvent dispersion performance, easy synthesis, and convenient storage and transportation.

Active Publication Date: 2010-10-20
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the commonly prepared graphene sol often contains excessive reducing agents and other impurities because it cannot be further purified, which hinders the application of graphene.

Method used

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  • Preparation method of grapheme capable of dispersing in organic solvent
  • Preparation method of grapheme capable of dispersing in organic solvent
  • Preparation method of grapheme capable of dispersing in organic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of embodiment 1-graphene

[0031] In the first step, add 120mL of concentrated sulfuric acid to a clean beaker, and place it in an ice-water bath to cool to 0°C, add 5g of flake graphite and 2.5g of sodium nitrate to it, stir for 5min, then add 15g of potassium permanganate in batches , control the temperature of the system not to exceed 20°C, after stirring for 2 hours, raise the temperature to 35°C and stir for 30 minutes. Continuously drop 250 mL of deionized water into the system to rapidly raise the temperature to about 98°C, and stir for 30 min. Add 500 mL of deionized water and 50 mL of 30% (mass concentration) hydrogen peroxide to stop the reaction, and stop after stirring for 5 min. After standing overnight until the graphene oxide particles settle, remove the supernatant. Then filter through a 0.22-micron polytetrafluoroethylene membrane, wash with a large amount of water to remove various ions, until no white precipitate is formed by adding ...

Embodiment 2

[0034] The preparation of embodiment 2-graphene

[0035] The preparation method is basically the same as in Example 1, except that the aniline compound with dendritic structure used is D 1 -NH 2 , after fully reacting it with graphene oxide, D 1 -GO, D can be obtained by hydrazine reduction 1 -RGO.

Embodiment 3

[0036] The preparation of embodiment 3-graphene

[0037] The preparation method is basically the same as in Example 1, except that the aniline compound with dendritic structure used is D 2 -NH 2 , after fully reacting it with graphene oxide, D 2 -GO, D can be obtained by hydrazine reduction 2 -RGO.

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Abstract

The invention relates to a preparation method of grapheme capable of dispersing in an organic solvent, comprising chemical reduction of a graphene oxide stem grafting arborization substituent group and graphene oxide. In the invention, the arborization substituent group with huge volume is utilized to functionalize graphene oxide, thereby the obtained graphene oxide can be dispersed in a majority of organic solvents, and after the graphene oxide is reduced by hydrazine hydrate, the obtained graphene still keeps excellent organic solvent dispersibility. In the invention, excess reactants, impurities and solvent in the preparation process of a solution method are removed by utilizing means of filtering and washing so that a purified graphene product is obtained, and the graphene product is powdery, is convenient to store and transport, and meets the requirement of preparation in macroscopic quantity. The graphene prepared by utilizing the invention has excellent solvent dispersibility, therefore, a powdery graphene sample can be dispersed in a specific organic solvent again as required to obtain required graphene sol for large-scale application.

Description

technical field [0001] The invention relates to a preparation method of graphene which can be dispersed in an organic solvent. Background technique [0002] Graphene, that is, single-layer graphite, is a new type of carbon material with a monolayer thick two-dimensional honeycomb structure composed of sp2 hybridized carbon atoms connected to each other. Due to its special structure, graphene has many special physical properties and extraordinary electrical, thermal, optical and mechanical properties, and has great potential in electronics, structural materials, energy storage materials, catalytic materials, sensing materials, etc. Application prospects. Since its discovery in 2004, basic and applied research on graphene has been in full swing around the world. [0003] However, in order to realize the practical application of graphene, its macro-controllable preparation method must be solved first. Currently developed graphene preparation methods mainly include mechanical...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 李维实赵福刚
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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