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Covalent functionalization graphene and preparation method thereof

A functionalized graphene technology, applied in the field of covalent functionalized graphene and its preparation, to achieve the effects of improved processing performance, improved dispersibility, and strong controllability

Inactive Publication Date: 2010-12-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the functionalization of graphene that have not been completely resolved, such as the simple, effective and controllable preparation method of functionalized graphene; the dispersibility of functionalized graphene, especially the monolithic dispersed functionalized graphite Preparation of graphene; Conductivity and processability of functionalized graphene, etc.

Method used

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  • Covalent functionalization graphene and preparation method thereof
  • Covalent functionalization graphene and preparation method thereof
  • Covalent functionalization graphene and preparation method thereof

Examples

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preparation example Construction

[0031] The preparation method of the covalently functionalized graphene is: add 1 weight part of graphene oxide and 0.1 to 100 weight parts of azide-containing substances in a reactor, and react for 0.1 to 72 hours, after suction filtration, centrifugation and washing, the covalently functionalized graphene was obtained.

[0032] Described graphene oxide is selected from using concentrated H 2 SO 4 / KMnO 4 , concentrated HNO 3 / Concentrated H 2 SO 4 / KClO 3 , or concentrated HNO 3 / NaClO 3 Graphene oxide made from graphite oxide.

[0033] The azide-containing substance is selected from an azide-containing compound or a mixture of compounds, wherein the structural formula of the azide-containing compound is:

[0034] N 3 -R 1 -R 2 -R 3 ,in,

[0035] R 1 Straight chain or branched alkyl, cycloalkyl, alkoxy, alkylamino, alkamide, alkyl ester, alkanone, alkyl dithio, alkyl silyl, alkyl phosphate group selected from C1-C100 , Fluoroalkyl, pyridyl, substituted pyrid...

Embodiment 1

[0040] Take KMnO 4 / Concentrated H 2 SO 4 Graphene oxide prepared by oxidation is used as the initial raw material, and reacted with azide-based compounds such as 2-azidoethanol to obtain hydroxyl-containing graphene. Add 50 mg of graphene oxide and 20 mL of N-methylpyrrolidone into a 50 mL three-neck round bottom flask equipped with a magnetic stirring rotor, add 1 g of 2-azidoethanol into the reaction flask, heat to 160 ° C, and react for 18 hour, after suction filtration or centrifugation, wash with acetone and N, N-dimethylformamide, obtain the functionalized graphene containing hydroxyl, thermal analysis shows that the organic components connected reach 20.9% (functionalized graphene containing hydroxyl) A scanning electron microscope image of graphene is shown in figure 2 a, the thermal weight loss curve is shown in image 3 a Curve 3, X-ray photoelectron spectroscopy see Figure 4 b, solubility photo see Figure 5 a and 5b).

Embodiment 2

[0042] Using the same reaction steps as in Example 1, using graphene oxide as the initial raw material, reacting with azido compounds such as 3-azidopropylamine to obtain functionalized graphene containing amino groups, thermal analysis shows that the organic components connected reach 23.9 %(the thermogravimetric curve figure of functionalized graphene containing amino group sees image 3 b Curve 5, X-ray photoelectron spectroscopy see Figure 4 c).

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Abstract

The invention discloses covalent functionalization graphene and a preparation method thereof. The preparation method of the covalent functionalization graphene comprises the following steps of: adding 1 part by weight of graphene oxide and 0.1-100 parts by weight of azido substances to a reactor; reacting for 0.1-72 hours in a hot bath at 100-220 DEG C; filtering, centrifugalizing, and washing to obtain the covalent functionalization graphene. In the invention, the graphene oxide is used as a raw material to directly react with an azido compound to prepare a covalently-modified functionalization graphene material based on nitrene chemistry by adopting a one-step method. The preparation method has simple and convenient method, simple process and large-scale production, is a general method and can enable multiple functional groups (such as hydroxyl, carboxyl, amino, bromo and long alkyl group) and high polymers (such as polyethylene glycol and polystyrene) to be covalently connected to the graphene. The obtained covalent functionalization graphene has good solvent dispersity and conductivity, and can be processed in a solvent and widely used in the fields of micro-nano electron, machinery, chemical engineering, high performance materials, and the like.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a covalent functionalized graphene and a preparation method thereof. Background technique [0002] Graphene is composed of a two-dimensional planar arrangement of carbon atoms, in which the carbon atoms are represented by sp 2 Hybrid connection, closely arranged on the honeycomb crystal lattice. sp 2 The bond length of the hybridized carbon atoms is 0.142 nm. Graphene is the thinnest two-dimensional material in the world, its thickness is only 0.35nm. The unique structure of graphene endows it with many special properties. Since it is composed of a single atomic layer, the specific surface of graphene is extremely large, and its theoretical calculation value is as high as 2600m 2 / g. Scientists tested their strength by piercing them with atomic-sized metal and diamond probes, and to their shock, graphene could be stronger than diamond, with a strength of up to 130GPa, s...

Claims

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Application Information

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IPC IPC(8): C01B31/00C01B31/04
Inventor 高超贺洪坤
Owner ZHEJIANG UNIV
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