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Graphene preparation method

A technology of graphene and graphite, which is applied in the field of graphene preparation, can solve problems such as harsh experimental conditions, complicated operation process, and influence on conductivity, and achieve the effects of guaranteed quality, small physical and chemical properties, and low cost

Inactive Publication Date: 2015-11-25
BEIHANG UNIV
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Problems solved by technology

On the one hand, the experimental method is that the graphene obtained after the reduction of graphene oxide prepared by graphite under the action of a strong oxidant has large defects, which seriously affects the conductivity; on the other hand, the use of organic solvents is easy to cause environmental pollution. At the same time, the operation process is complex and the experimental conditions are demanding

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preparation example Construction

[0033] Such as figure 1 Shown, present embodiment provides a kind of graphene preparation method, described method comprises:

[0034] Step S110: dissolving graphite and surfactant in water to form a mixed solution; wherein, the concentration of graphite is 0.1 mg.mL -1 to 14mg.mL -1 , the concentration of the surfactant is 0.1mg.mL -1 to 0.7mg.mL -1 ;

[0035] Step S120: adding the mixed solution into a mechanical milling device and milling to form a milling liquid;

[0036] Step S130: leave the grinding room to stand, and obtain the supernatant of the grinding liquid to form a first supernatant;

[0037] Step S140: adding the first supernatant into a centrifuge for centrifugation, and obtaining a second supernatant after centrifugation;

[0038] Step S150: filtering and drying the second supernatant to obtain graphene.

[0039] Graphite is an allotrope of element carbon, and the periphery of each carbon atom is connected with three other carbon atoms (usually arranged...

example 1

[0055] Step 1: Mix 50g of graphite and 4.5g of sodium dodecylsulfonate to form a mixture; wherein, the graphite is magnified 250 times in a scanning electron microscope (FE-SEMJEOLJSM-6700F voltage: 10KV, focal length: 11.5mm) , observe its appearance, the thickness of the graphite sheet is 42um;

[0056] Step 2: Disperse the above mixture into 9L of aqueous solution and stir evenly to form a mixed solution

[0057] Step 3: Slowly add the above-mentioned mixed solution into a rotating millstone for grinding, take out the mixed solution after 48 hours and let it stand for 1 hour, and take its supernatant; the supernatant is the first supernatant;

[0058] Step 4: Add the above-mentioned first supernatant to a centrifuge for centrifugation; the speed of the centrifuge is 4000rpm / min, and the centrifugation time is 20min; take the supernatant of the centrifuge; the supernatant is the first Two supernatants;

[0059] Step 5: make the above-mentioned second supernatant into a sam...

example 2

[0062] Step 1: Mix 60% graphite and 5g sodium dodecylbenzenesulfonate to form a mixture; wherein, the graphite is magnified 250 times in a scanning electron microscope (FE-SEMJEOLJSM-6700F voltage: 10KV, focal length: 11.5mm) , observe its appearance, the thickness of the graphite sheet is 42um;

[0063] Step 2: Disperse the above mixture into 2 to 10L water, stir well to form a mixed solution

[0064] Step 3: Slowly add the above-mentioned mixed solution into a rotating millstone for grinding, take out the mixed solution after 56 hours and let it stand for 2 hours, and take its supernatant; the supernatant is the first supernatant;

[0065] Step 4: Add the above-mentioned first supernatant to a centrifuge for centrifugation; the speed of the centrifuge is 5000rpm / min, and the centrifugation time is 30min; take the supernatant of the centrifugate; the supernatant is the first Two supernatants;

[0066] Step 5: make the above-mentioned second supernatant into a sample, and ob...

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Abstract

The present invention discloses a graphene preparation method, which is designed for solving the problem that industrial mass production by using the existing graphene preparation methods is difficult. The graphene preparation method comprises: dissolving graphite and a surfactant in water to form a mixed solution, wherein, a concentration of the graphite is 0.1 mg. mL-1 to 14mg.mL-1, a concentration of the surfactant is 0.1 mg.mL-11 to 0.7 mg.mL-1; adding the mixed solution to a mechanical milling equipment to be milled to form a milling liquid; standing the milling liquid, to form a first supernatant liquid; adding the first supernatant liquid to a centrifugation equipment to perform centrifugation treatment, and obtaining a second supernatant liquid after centrifugation; and filtering and drying the second supernatant liquid, to obtain graphene. The graphene preparation method has advantages of low costs of equipments, high purity of graphene and stable performance, and is suitable for large scale industrial production.

Description

technical field [0001] The invention relates to a preparation method, in particular to a graphene preparation method. Background technique [0002] Graphene is a new type of carbon material, which is a two-dimensional honeycomb crystal structure formed by a single layer of carbon atoms tightly packed. The arrangement of atoms in a single layer of graphene makes it one of the thinnest known materials, yet strong and rigid; as a single substance, it transfers electrons faster than any known conductor at room temperature. These excellent properties of graphene make graphene show great application prospects in the fields of radio frequency transistors, ultra-sensitive sensors, flexible transparent conductive films, super-strong and high-conductivity composite materials, high-performance lithium-ion batteries, and supercapacitors. [0003] Existing graphene preparation methods mainly include methods for preparing graphene such as chemical vapor deposition, surface epitaxial grow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 滕超鹿现永朱英江雷
Owner BEIHANG UNIV
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