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Preparation method of modified graphite

A graphene and modification technology, which is applied in the field of preparation of modified graphene, can solve the problems of affecting electron transport on the basal surface of graphene sheets, the inability to remove oxygen-containing functional groups, and the decline in electron transport performance, so as to achieve low cost and low raw material Inexpensive, easy-to-handle effects

Inactive Publication Date: 2014-05-14
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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Problems solved by technology

[0003] At present, the conductivity of graphene prepared by redox method is low. The main reason is that on the one hand, oxidation will leave defects on graphene, which will affect the transmission of electrons on the basal plane of graphene sheets. It is because the reduction cannot completely remove the oxygen-containing functional groups on the graphite oxide, and after the oxygen-containing functional groups are removed, defects will be left in the graphene, resulting in a significant decrease in the electron transport performance, thus making the prepared graphene have a low conductivity.

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  • Preparation method of modified graphite

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preparation example Construction

[0028] see figure 1 , the preparation method of the modified graphene of an embodiment comprises the following steps:

[0029] S101, oxidize the graphite to obtain graphite oxide.

[0030] The specific steps are: add graphite to the mixed solution of concentrated sulfuric acid and concentrated nitric acid, stir in an ice-water mixing bath while keeping the temperature at about 0°C; then slowly add potassium permanganate to the mixed solution In the process, because potassium permanganate has strong oxidizing properties under acidic conditions, graphite can be oxidized; then the mixed solution is heated to 85°C for reaction and kept for 30 minutes. During the heat preservation process, graphite can be further oxidized ; Add deionized water, continue to maintain 85 ° C temperature for 30 minutes; then add hydrogen peroxide to the mixed solution, remove excessive potassium permanganate, obtain graphite oxide solution; graphite oxide solution is suction filtered to obtain a solid...

Embodiment 1

[0041] (1) Weigh 1 g of graphite with a purity of 99.5%, add it to a mixed solution consisting of 90 mL of concentrated sulfuric acid with a mass fraction of 98% and 25 mL of concentrated nitric acid with a mass fraction of 65%, and place the mixture in an ice-water mixing bath environment Stir for 20 minutes; slowly add 6 g of potassium permanganate to the mixture, stir for 1 hour, heat the mixture to 85° C. and keep it for 30 minutes; then add 92 mL of deionized water and keep it at 85° C. for 30 minutes Add 10mL hydrogen peroxide solution with a mass fraction of 30%, and stir for 10 minutes; the mixture is suction-filtered, and the solid matter is washed with 100mL dilute hydrochloric acid and 150mL deionized water respectively, and the solid matter is washed three times in total, and finally the solid matter is washed at 60° C dried in a vacuum oven for 12 hours to obtain graphite oxide.

[0042] (2) Disperse the graphite oxide obtained in (1) in deionized water, and use a...

Embodiment 2

[0046] (1) Weigh 3 g of graphite with a purity of 99.5%, add it to a mixed solution consisting of 285 mL of concentrated sulfuric acid with a mass fraction of 98% and 72 mL of concentrated nitric acid with a mass fraction of 65%, and place the mixture in an ice-water mixing bath environment Stir for 20 minutes; then slowly add 12g potassium permanganate to the mixture, stir for 1 hour, heat the mixture to 85°C and keep it for 30 minutes; add 150mL deionized water and continue to keep it at 85°C for 30 minutes, Finally, 18 mL of hydrogen peroxide solution with a mass fraction of 30% was added and stirred for 10 minutes; the mixture was suction-filtered, and then the solid was washed with 200 mL of dilute hydrochloric acid and 30 mL of deionized water respectively for three times, and finally the solid was washed at 60 Dry in a vacuum oven for 12 hours at °C to obtain graphite oxide.

[0047] (2) Disperse the graphite oxide obtained in (1) in deionized water, and use an ultrason...

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Abstract

A preparation method of modified graphene is as below: oxidizing graphite to obtain graphite oxide; dispersing the graphite oxide in deionized water, conducting ultrasound treatment for 1-4 h to obtain a first dispersion with concentration of 0.5-1.0 g / L; adding hydroiodic acid in the first dispersion to obtain a second dispersion, wherein the hydroiodic acid in the second dispersion has concentration of 0.05-0.5g / L, stirring, filtering, washing filtering products, and drying to obtain graphene; and placing the graphene in inert gas and ethanol vapor environment, heating to 400-800 DEG C and insulating for 0.5-2.0 h and cooling to room temperature to obtain the modified graphene. According to the above preparation method of modified graphene, hydroiodic acid as a reducing reagent reacts with graphite oxide to obtain the graphite; and the graphite is restored under the effect of ethanol vapor to obtain the modified graphene. The prepared modified graphene material has high electrical conductivity. The preparation method has the advantages of simple requirement of equipment and process, easiness to operate, cheap raw materials and low cost, and is easy to realize large-scale industrialized production.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a preparation method of modified graphene. Background technique [0002] Graphene is a two-dimensional monolayer material composed entirely of carbon atoms. It is the thinnest material found so far, which makes graphene have excellent properties such as high specific surface area, high electrical conductivity, high mechanical strength and excellent Toughness, etc., have the potential to be applied in many fields, so they have received extensive attention from researchers. The theoretical conductivity of graphene can reach 10 8 S / m, but in fact the conductivity of graphene prepared by redox method is far lower than this value, only 10 3 S / m, which greatly restricts the application of graphene. [0003] At present, the conductivity of graphene prepared by redox method is low. The main reason is that on the one hand, oxidation will leave defects on graphene, which will affect th...

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Application Information

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IPC IPC(8): C01B31/04C01B32/19C01B32/194
Inventor 周明杰钟辉王要兵刘大喜
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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