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Graphene and preparation method thereof

A graphene and graphene technology, applied in the field of graphene and its preparation, to achieve the effects of good biological application prospects, increased dispersion ability, and improved dispersion stability

Active Publication Date: 2017-03-08
刘果
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, gallic acid and tannic acid have been used as composite reducing agents and polyvinylpyrrolidone / polyethylene glycol copolymers as dispersants to prepare graphene that can form stable, highly dispersible dispersions and has biological application prospects. Not yet reported

Method used

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  • Graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0035] The preparation method of graphene oxide is as follows:

[0036] First, add 1g of potassium persulfate and 1g of phosphorus pentoxide to a 500ml three-neck round bottom flask, then add 10ml of concentrated sulfuric acid, and heat to 70°C; at this time, add 2g of graphite powder into the flask and react for 4.5 hours under magnetic stirring Pre-oxidation; then, add 200 mL of deionized water at a rate of 0.5 mL / s, then transfer the mixture to a 1000 mL container, and let it stand for 24 hours; filter it with a nylon microporous membrane with a pore size of 0.22 μm, and use The filter cake was washed several times with deionized water, and finally the filter cake was transferred to a watch glass and dried under vacuum.

[0037] Next, put the pre-oxidized graphite in a 1000ml three-necked flask, add 40ml of concentrated sulfuric acid, place the system in an ice bath, after constant temperature, slowly add 5g of potassium permanganate under mechanical stirring, and keep the ...

Embodiment 1

[0039] A kind of preparation method of graphene specifically comprises the steps:

[0040] 1) Take the graphene oxide prepared in Preparation Example 1;

[0041] 2) Add 1g of graphene oxide to 50ml of anhydrous toluene, ultrasonically disperse evenly, add 5g of silane coupling agent polyethylene glycol trimethoxysilyl propyl ether under the protection of inert gas, and reflux for 12 hours to obtain silane coupling Graphene oxide modified by the coupling agent, filtered, washed three times with anhydrous toluene, and dried;

[0042] 3) Ultrasonic disperse 1 g of silane coupling agent-modified graphene oxide obtained in step 2) into 200 ml of deionized water, add 6 ml of initiator, 50 ml of N-vinylpyrrolidone, ultrasonically disperse for 1 h, and stir at 70 °C under an inert atmosphere React for 6 hours, then add 50 ml of polyethylene glycol monoallyl ether, continue to react for 12 hours, then heat up and then reflux for 12 hours to obtain vinylpyrrolidone-polyethylene glycol ...

Embodiment 2

[0045] A kind of preparation method of graphene specifically comprises the steps:

[0046] 1) Take the graphene oxide prepared in Preparation Example 1;

[0047] 2) Add 1g of graphene oxide to 50ml of anhydrous toluene, ultrasonically disperse evenly, add 5g of silane coupling agent polyethylene glycol trimethoxysilyl propyl ether under the protection of inert gas, and reflux for 12 hours to obtain silane coupling Graphene oxide modified by the coupling agent, filtered, washed three times with anhydrous toluene, and dried;

[0048] 3) Ultrasonic disperse 1 g of silane coupling agent-modified graphene oxide obtained in step 2) into 200 ml of deionized water, add 6 ml of initiator, 100 ml of N-vinylpyrrolidone, ultrasonically disperse for 1 h, and stir at 70 °C under an inert atmosphere React for 6 hours, then add 50 ml of polyethylene glycol monoallyl ether, continue to react for 12 hours, then heat up and then reflux for 12 hours to obtain vinylpyrrolidone-polyethylene glycol...

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Abstract

The invention provides a preparation method of graphene. The preparation method includes the steps of firstly, preparing graphene oxide; secondly, using a silane coupling agent to modify the graphene oxide; thirdly, adding an initiator in the presence of the modified graphene oxide obtained in the second step, and copolymerizing N-vinyl pyrrolidone and polyethylene glycol monoallyl ether to obtain silane coupling agent modified graphene oxide dispersing liquid using copolymer as the dispersing agent; fourthly, adding gallic acid and tannic acid into the modified graphene oxide dispersing liquid obtained in the third step to perform reduction reaction so as to obtain the end-product graphene. The prepared graphene is promising in bio-application prospect and capable of forming stable and high-concentration dispersing liquid.

Description

technical field [0001] The invention relates to a graphene and a preparation method thereof, in particular to a graphene with biological application prospects and capable of forming a stable, high-concentration dispersion liquid and a preparation method thereof. Background technique [0002] Graphene, also known as a single-layer graphite sheet, is a film composed of a layer of carbon atoms densely arranged on a hexagonal honeycomb lattice. It is not only the thinnest material known in the world, but also the only one discovered so far. Two-dimensional free-state atomic crystals. The carbon atoms in graphene are arranged in a unique two-dimensional structure, which has many excellent characteristics, such as high strength, excellent thermal conductivity and electrical conductivity, and a large specific surface area, and its synthetic raw material is graphite, which is cheap. Therefore, graphene has good application prospects in transistors, solar cells, sensors, supercapaci...

Claims

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Application Information

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IPC IPC(8): C01B32/184
Inventor 刘畅刘果刘英博
Owner 刘果
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