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Preparation method of graphene material

A graphene and graphene film technology, applied in nanotechnology and other directions, can solve the problems of difficulty in controlling the thickness of graphene oxide and ensuring sufficient expansion of graphite oxide, and achieve the effects of effective utilization, high yield and avoiding high temperature reactions

Inactive Publication Date: 2013-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent CN101786620A, three steps of oxidation-dispersion-reduction are used to obtain graphene. The process is simple and the time is short, but it is difficult to ensure that the graphite oxide is fully expanded, so the thickness of the obtained graphene oxide is difficult to control

Method used

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  • Preparation method of graphene material

Examples

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Embodiment 1

[0042] The preparation method described in this embodiment includes the following steps:

[0043] 1. Add 2g of flake graphite to the dried and cleaned beaker, add 100ml of 98% concentrated sulfuric acid in an ice bath, stir thoroughly to make graphite and concentrated sulfuric acid mix uniformly, then add 1.5g solid sodium nitrate and stir for 30min , Fully dissolved. Then slowly add 6g of potassium permanganate solid in batches (0.5g each time, each time interval is 10min), control the temperature of the reaction system not to exceed 20°C, and react for 6h. After that, the ice bath was removed, and the reaction was heated in a water bath to raise the temperature to 35° C. and reacted for 24 hours. Then add 9g potassium permanganate (0.5g each time, each time interval is 10min), and react for 4h.

[0044] 2. Then add 100ml 98% concentrated sulfuric acid to react for 24h to obtain a reddish brown viscous liquid. The viscous liquid was cooled to room temperature, and the reaction ...

Embodiment 2-10

[0048] The operation steps are the same as in Example 1. The conditions control and the results of the graphite oxide colloidal product are listed in the following table:

[0049]

[0050]

[0051] *The obtained graphite oxide colloid is the same as in Example 1, and is easy to convert into other graphene materials.

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Abstract

The invention discloses a preparation method of a graphene material. The preparation method comprises the following steps of: with graphite carbon as a raw material, adding potassium hypermanganate and concentrated sulfuric acid in batches in different stages to control an oxidation process of graphite; adjusting the pH value of the oxidized solution to obtain graphene oxide colloidal dispersing solutions (GOS) with different concentrations; dropwise adding the GOS on the surface of a carrier or spreading out the GOS on a non-intersolubility liquid / liquid interface and drawing into a grapheneoxide thin-film (GOF); carrying out high-speed centrifugation and drying treatment on the GOS to obtain graphene oxide solid powder (GOP); reducing the GOS by selecting an appropriate reducing agent,and centrifugally drying to obtain reduced graphene solid powder (GRP); dispersing a proper amount of GRP in an organic solvent to prepare a reduced graphene oxide colloidal dispersing solution (GRS); and dropwise adding the GRS on the surface of the carrier or spreading out on the non-intersolubility liquid / liquid interface and drawing into the reduced graphene thin-film (GRF). Various graphene materials prepared by the invention are easy to mutually transform; and the concentration of the colloidal solution and the thickness of the thin-film can be controlled in a certain range.

Description

Technical field [0001] The invention relates to a method for preparing graphene materials related to the technical field of nanomaterials, in particular to a method for obtaining graphene materials in a new processing mode. Background technique [0002] Graphene, a two-dimensional atomic crystal material composed of a single layer of carbon atoms closely arranged. In 2004, a single graphite sheet obtained by scientists Geim A K and others repeatedly peeled off the graphite sheet through adhesive tape. Before the discovery of graphene, it was believed theoretically and experimentally that a perfect two-dimensional structure could not exist stably at non-absolute zero. Therefore, the discovery of graphene has attracted worldwide attention, and its discoverer won the 2010 promise. Bell Prize in Physics. [0003] In fact, graphene is the constituent unit of carbon-based materials in other dimensions. Zero-dimensional fullerene can be seen as agglomeration of specific graphene shapes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y40/00
Inventor 刘洪涛刘艳
Owner CENT SOUTH UNIV
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