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Surface-modified graphene

A technology of surface modification and surface modifier, applied in the direction of dyed organosilicon compound treatment, dyed low-molecular-weight organic compound treatment, fibrous filler, etc., can solve the problems of graphene surface bonding, high cost, etching method Complexity and other issues, to achieve the effects of wide applicability, improved affinity, and improved dispersibility

Active Publication Date: 2013-01-30
杭州烯创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] U.S. Patent No. 20100178464 etches the edge of graphene, and then connects organic functional groups on the etched edge, such as -COOH, -C=O, etc., so as to improve the characteristics of the graphene surface. However, the etching method is complicated and expensive. There are also doubts about the adhesion of the selected organic functional groups to the graphene surface

Method used

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Examples

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example 1

[0037]Example 1 first carries out surface analysis for the pure graphene powder after synthesis, figure 2 It is a TEM picture, showing that pure graphene is an extremely thin sheet structure with a surface area of ​​430m 2 / g, the oxygen content is 1.3wt%; image 3 It is the carbon element test result of XPS, and the result shows that there are still a small part of carbon oxygen or carbon hydrogen functional groups on the surface of graphene powder.

example 2

[0038] Example 2 adopts coupling agent aminosiloxane (3-Aminopropyl triethoxysilane) as a surface modifier, and its structure is Si(C 3 h 6 N)(C 2 h 5 O) 3 , the implementation method is to add the surface modifier into a mixed solution of ethanol and water, then add graphene powder for mixing and stirring, and finally take out the powder by suction and filtration and heat and dry in an oven to obtain the surface modified Graphene powder. Figure 4 It is the modified graphene TEM image, which shows that there is another layer of film on the surface of the graphene powder, which may be the coating of the surface modifying agent. Figure 4 EDS analysis at the circles can detect such as Figure 5 The Si element signal shown at the same time proves that there is a surface modifier on the surface of the graphene powder; Figure 6 (A) and Figure 6 (B) are XPS diagrams of the graphene powder after modification, and it can be seen from the figure Signals of silicon and nitrogen e...

example 3

[0039] Example 3 adopts coupling agent tetrabutyloxytitanium (Titanium n-butoxide) as surface modifier, and its structure is Ti(C 4 h 9 O) 4 , the implementation method is to add the surface modifier into an isopropanol solvent, then add graphene powder for mixing and stirring, and finally take out the powder by suction and filtration and heat and dry in an oven to obtain surface-modified graphene Powder. Figure 7 It is the XPS diagram of the modified graphene powder. From the figure, it can be seen that the signal of titanium element appears on the surface of the graphene powder, which proves that the surface modifier is definitely coated on the surface of the graphene powder.

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Abstract

The invention provides a surface-modified graphene, comprising a graphene powder and at least one surface-modified layer, wherein the least one surface-modified layer comprises a surface modification agent and at least two functional groups disposed at two ends of the surface modification agent respectively; one functional group of the at least two functional groups can generate a chemical bond with an organic functional group on the surface of the surface-modified graphene powder; and the other functional group of the at least two functional groups forms a surface characteristic of the surface-modified graphene, wherein the surface modification agent comprises at least one of a coupling agent, aliphatic acid and a resin. Therefore, the surface-modified graphene powder can increase the dispersibility of the graphene powder in a solvent, enhance the endophilicity between the graphene powder and an organic polymer, and make the composite material to be more durable and to have wider applications.

Description

technical field [0001] The invention provides a surface-modified graphene, in particular to a surface-modified graphene capable of changing the surface properties of graphene powder through a surface modifying agent. Background technique [0002] Single-layer graphite, also known as graphene, is a two-dimensional honeycomb lattice structure in which a single layer of carbon atoms is tightly packed with graphite bonds (sp2), so it is only one carbon atom thick and graphite bonds It is a compound bond of covalent bond and metal bond, which can be said to be the perfect combination of insulator and conductor. In 2004, Andre Geim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully used adhesive tape to peel off graphite, confirming that a single layer of graphene can be obtained, and won the 2010 Nobel Prize in Physics. [0003] Graphene is currently the thinnest and hardest material in the world. Its thermal conductivity is higher than t...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/04C09C1/46C09C3/08C09C3/10C09C3/12
Inventor 吴以舜谢承佑彭晟书陈静茹林君孟林庚蔚
Owner 杭州烯创科技有限公司
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