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Method for preparing graphene modified by silane coupling agent

A technology of silane coupling agent and graphene, which is applied in the field of preparation of silane coupling agent modified graphene, to achieve the effects of fast hydrolysis, easy process control and low reaction conditions

Inactive Publication Date: 2012-08-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not involve the modification of graphene with bis-alkoxy or trialkoxy silane, so the use of bis-alkoxy or trialkoxy silane to modify graphene is still in the technical blank

Method used

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  • Method for preparing graphene modified by silane coupling agent
  • Method for preparing graphene modified by silane coupling agent
  • Method for preparing graphene modified by silane coupling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Take 0.1 g of graphite oxide, disperse it into 100 mL of DMF, pour it into a 250 mL three-necked flask, add 0.1 g of γ-aminopropyltriethoxysilane, and react under mechanical stirring (800 RPM) at room temperature for 12 hours, then filter with suction. After washing with DMF several times, graphite oxide modified with γ-aminopropyltriethoxysilane was obtained. Take 0.1 g of γ-aminopropyltriethoxysilane-modified graphite oxide, transfer it to a 250 mL three-neck flask, add 0.2 g of hydrazine hydrate and 100 mL of DMF, heat to 80 °C, and react for 12 h under mechanical stirring (200 RPM) , cooled to room temperature, suction filtered and washed with DMF several times, and dried in vacuum at 40°C to obtain γ-aminopropyltriethoxysilane-modified graphene.

[0036] Take a sample and test the product. figure 1 is a transmission electron micrograph of graphite oxide modified with γ-aminopropyltriethoxysilane; figure 2 is a transmission electron micrograph of graphene modified...

Embodiment 2

[0038] The preparation method is the same as in Example 1, wherein the γ-aminopropyltriethoxysilane is replaced by a siloxane conforming to the following general formula: R-Si(OR 1 ) 3 or R R 2 -Si(OR 1 ) 2 , where R is a hydrogen atom, methyl, ethyl, propyl, butyl, phenyl, cyclohexyl, vinyl, propenyl, aminoethylaminopropyl, mercaptopropyl, anilinomethyl and other organic groups , R 1 is methyl or ethyl, R 2 is a hydrogen atom, methyl or ethyl.

[0039] Take a sample and test the product. Figure 4 to Figure 7 They are graphite oxide, graphite oxide modified by γ-aminopropyltriethoxysilane, graphite oxide modified by N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and N-(β-ammonia The XPS spectrum of graphene modified by ethyl)-γ-aminopropyltrimethoxysilane, it can be seen from the figure that there are more characteristic double peaks of silicon in the last three figures, indicating that the silane coupling agent molecule has been successfully modified to on the surf...

Embodiment 3

[0041] Take 0.1 g of graphite oxide, disperse it into 150 mL of methanol, pour it into a 250 mL three-necked flask, add 0.01 g of γ-aminopropyltriethoxysilane, react under mechanical stirring (1000 RPM) at 0 ℃ for 72 hours, and filter with suction , washed with methanol several times to obtain γ-aminopropyltriethoxysilane-modified graphite oxide. Take 0.1 g of γ-aminopropyltriethoxysilane-modified graphite oxide, transfer it to a 250 mL three-necked flask, and add 0.05 g of sodium borohydride and 150 mL of methanol. Under mechanical stirring (1000RPM), react at room temperature for 24 h, filter with suction and wash with methanol several times, and dry at room temperature to obtain γ-aminopropyltriethoxysilane-modified graphene.

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Abstract

The invention discloses a method for preparing graphene modified by a silane coupling agent. The method includes adding graphite oxide and the silane coupling agent into reaction solvent, controlling the temperature to range from 0 DEG C to 90 DEG C, realizing stirred reaction for 0.1 to 72 hours and obtaining graphite oxide grafted with the silane coupling agent; adding the graphite oxide grafted with the silane coupling agent into reduction solvent, adding a reducer into the reduction agent, controlling the temperature to range from 0 DEG C to 90 DEG C, realizing stirred reduction reaction for 0.1 to 72 hours and obtaining graphene liquor grafted with the silane coupling agent; and treating the graphene liquor grafted with the silane coupling agent and then obtaining solid graphene powder modified by the silane coupling agent. The mass ratio of the graphite oxide and the silane coupling agent is 1:0.1-5. The technological method is simple and speedy, requirements on reaction conditions are low, a process is easy to control, and the graphene modified by the silane coupling agent can be obtained without catalysts or multi-step complicated reaction. The graphene is fine in polymer compatibility and simple in preparation and can be widely applied to fields of preparation of graphene modified polymers and novel electrochemical electrodes and novel optical and conductive materials, raw materials are easily available, and a product has good dispersibility in partial organic solvent.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene modified by a silane coupling agent. The graphene prepared by the method can be applied to the preparation of graphene / polymer composite materials, new conductive materials and new Optical materials and the preparation of new electrochemical electrodes and other fields. Background technique [0002] Graphene is a sp 2 The 2-dimensional honeycomb monoatomic sheet composed of hybridized carbon atoms has many excellent properties: its Young's modulus reaches 1 TPa, its ultimate strength is as high as 130 GPa; its thermal conductivity can reach 5000 W / (m ·K); the electrical conductivity is up to 6000 S / cm, and unlike carbon nanotubes, chirality does not affect the electrical conductivity of graphene; in addition, graphene also has a very high specific surface area and gas impermeability. These advantages have made graphene a hot spot in the field of...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184
Inventor 袭锴王远董小虎张弢贾叙东余学海
Owner NANJING UNIV
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