Preparation method of graphene solution phase

A graphene and solution phase technology, applied in the field of graphene solution phase preparation, can solve problems such as uneven distribution, complex operation, harsh conditions, etc., and achieve the effects of strong controllability, low price and good stability

Active Publication Date: 2009-12-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first three methods are difficult to apply to the large-scale production of graphene due to complex operations, harsh conditions or low yields
In comparison, the solution-phase preparation method has a large output and is easy to operate, and it is most likely to realize the large-scale preparation of materials. However, the graphene obtained by this method is currently small in size (usually several microns in size), unevenly distributed, and the product The concentration is low (usually less than 1 g / L), and there is still a long distance from large-scale preparation, which seriously limits the subsequent large-scale application

Method used

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  • Preparation method of graphene solution phase

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In the first step, 1.2 grams of potassium nitrate was weighed, added to 46 milliliters of concentrated sulfuric acid, 1.0 grams of graphite (50 mesh) was added thereto, after mixing evenly, 6.0 grams of potassium permanganate was slowly added under stirring. The system was then heated to 40°C and stirring was continued for 6 hours. Then 80 ml of water was slowly added dropwise, while the system was warmed up to 70° C. and kept stirring for 30 minutes. Add 200 milliliters of water and 6 milliliters of hydrogen peroxide (mass percentage concentration 30%), stop after stirring for 5 minutes. After the graphite oxide particles settle, remove the supernatant. Add water to the primary product and wash it several times until the pH value of the system reaches about 5 to obtain a pure graphite oxide mother liquor.

[0025] In the second step, the graphite oxide mother liquor was placed on a constant speed oscillator, and vibrated at a frequency of 160 rpm for 12 hours to obta...

Embodiment 2

[0028] The preparation method is basically the same as in Example 1, except that the polymer surfactant used is Tween 80 (Tween 80), and the dosage is 8 grams (10% aqueous solution).

Embodiment 3

[0030] The preparation method is basically the same as in Example 1, except that the polymer surfactant used is Triton X100 (Triton X100), and the dosage is 8 grams (10% aqueous solution).

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Abstract

The invention relates to a preparation method of graphene solution phase. The method is characterized by comprising the following steps: (1) oxidizing graphite, (2) stripping mother liquid of the oxidized graphite, (3) reducing graphene oxide, wherein, polymer surface-active agent added into colloidal solution of graphene oxide is used as stabilizing agent and hydrazine hydrate is used as reducing agent. Compared with the prior art, the invention has the advantages that the obtained graphene has large area which can reach thousands or more square microns; the effective control of the sizes of graphene product can be realized only by selecting the size of the raw material of graphite, and the size of graphene can be effectively controlled between 20-200 microns; the concentration of the obtained graphene soliquid is high, which can be up to 5-10g / l, the stability of the graphene soliquid is good, and the graphene soliquid can not be subsided when being stewed for months; the method has the advantages of simple whole process, strong controllability and low price of adopted polymer surface active agent, thus being applicable to low-cost and large-scale production.

Description

technical field [0001] The invention relates to a solution-phase preparation method of graphene. Background technique [0002] Since its first discovery in 2004, graphene (i.e., single-layer graphite) has immediately aroused great interest in the scientific community and has become one of the hottest materials in recent years. Graphene has a very high electron transport rate due to its unique two-dimensional crystal structure, and is the material with the highest mechanical strength known. At the same time, it has stable chemical properties, transparency, and excellent thermal conductivity, so it is extremely useful in many fields. Attractive application prospects. Basic and applied research on graphene has also been in full swing worldwide. [0003] The preparation of graphene has always been a hot topic of concern, because it is directly related to the subsequent application of the material. The preparation methods that have been reported so far mainly include mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 刘兆平周旭峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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