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A kind of preparation method of graphene material

A technology of graphene and graphene film, which is applied in the direction of nanotechnology, can solve the problems of difficulty in controlling the thickness of graphene oxide and ensuring sufficient expansion of graphite oxide, and achieve the effect of effective utilization, high yield and simple preparation process

Inactive Publication Date: 2011-12-14
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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  • A kind of preparation method of graphene material
  • A kind of preparation method of graphene material
  • A kind of preparation method of graphene material

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Embodiment 1

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

[0043] 1. Add 2g of graphite flakes to a beaker that has been dried and washed. Under ice bath conditions, add 100ml of 98% concentrated sulfuric acid. Stir thoroughly to mix the graphite and concentrated sulfuric acid evenly. Then add 1.5g of sodium nitrate solid and stir for 30min. , fully dissolved. Then slowly add 6 g of potassium permanganate solid in batches (0.5 g each time, the interval between each time is 10 min), control the temperature of the reaction system not to exceed 20 ° C, and react for 6 h. Afterwards, the ice bath was removed, and the reaction was heated in a water bath to raise the temperature to 35° C., and the reaction was carried out for 24 hours. Then add 9g of potassium permanganate, (0.5g each time, each interval is 10min), and react for 4h.

[0044] 2. Subsequently, 100ml of 98% concentrated sulfuric acid was added to react for 24 hours to obtain a reddish...

Embodiment 2-10

[0048] Operating steps are with embodiment 1, condition control and graphite oxide colloid product result are listed in the following table:

[0049]

[0050] *The obtained graphite oxide colloid is the same as embodiment 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 nanometer materials, in particular to a method for obtaining graphene materials in a new processing manner. Background technique [0002] Graphene is a two-dimensional atomic crystal material composed of a single layer of closely arranged carbon atoms. In 2004, the graphite monolithic sheet was obtained by the scientist Geim A K et al. by repeatedly peeling off the graphite sheet through tape. Before graphene was discovered, both theoretically and experimentally, it was believed that the perfect two-dimensional structure could not exist stably at non-absolute zero temperature, so the discovery of graphene attracted the attention of the whole world, and its discoverer won the 2010 Nobel Prize. Bell Prize in Physics. [0003] In fact, graphene is the building block of carbon-based materials in other dimensions. Zero-dimensional fullerenes can be regard...

Claims

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Application Information

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