Single-layer wrinkled graphene and production method and application thereof
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A graphene and wrinkle technology, which is applied in the field of single-layer wrinkled graphene and its preparation, can solve the problems of requiring a substrate template, high dependence, high energy consumption for high temperature thermal reduction, and achieves a simple and efficient method, improves production efficiency, and suppresses stacking. stacking effect
Active Publication Date: 2019-11-12
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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This technology is highly dependent on equipment, the conditions are harsh and the energy consumption of high temperature thermal reduction is high
The template method is to distribute graphene
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Embodiment 1
[0045] Embodiment 1: the preparation of a kind of monolayer wrinkled graphene
[0046] (1) The process of chemically oxidizing, exfoliating and centrifuging natural graphite flakes to obtain a graphene oxide dispersion, mixing 500 mL of a 1.0 mg / mL graphene oxide dispersion with 25 mL of concentrated ammonia (25%-28%), and heating To 70°C, stir and reflux for 0.5h;
[0047] (2) Centrifuge the solution after alkali washing at 10,000 rpm for 0.5 h to obtain a solid precipitate, wash with water and then centrifuge, and disperse the centrifuged solid in 500 mL of 0.01M hydrochloric acid to obtain a mixed solution;
[0048] (3) Heat the mixed solution to 70°C, stir and reflux for 0.5h, and then perform centrifugation at 10,000 rpm for 0.5h after cooling, wash the centrifuged solid with water and then centrifuge, and redisperse the centrifuged solid in water to obtain 2.5mg / mL graphene oxide dispersion.
[0049] (4) Mix the graphene oxide dispersion with ascorbic acid, the graphen...
Embodiment 2
[0050] Embodiment 2: the preparation of a kind of monolayer wrinkled graphene
[0051] The difference from Example 1 is that the concentration of the graphene oxide dispersion in the preparation step of the graphene oxide alkaline dispersion solution is 2.0 mg / mL. Obtained graphene was observed by scanning electron microscope, and its surface morphology was as follows: figure 2 It can be seen from the figure that the surface of the graphene powder is highly wrinkled and distributed in a single layer.
Embodiment 3
[0052] Embodiment 3: the preparation of a kind of monolayer wrinkled graphene
[0053] The difference from Example 1 is that the ammonia water in the preparation step of the graphene oxide alkaline dispersion solution is replaced by sodium hydroxide. Obtained graphene was observed by scanning electron microscope, and its surface morphology was as follows: image 3 It can be seen from the figure that the surface of the graphene powder is highly wrinkled and distributed in a single layer.
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Abstract
The invention relates to single-layer wrinkled graphene and a production method and application thereof. The production method comprises the following steps of mixing and heating graphene oxide dispersion liquid and an alkaline solution to obtain an alkaline dispersion solution of graphene oxide; subjecting the alkaline dispersion solution of the graphene oxide to centrifugal separation and clearwater washing, and dispersing solid sediment in a hydrochloric acid solution again to obtain a mixed solution; then conducting heating acidification, after cooling is conducted, conducting centrifugalseparation and clear water washing, and dispersing a solid subjected to centrifugation in water to obtain wrinkled graphene oxide dispersion liquid subjected to alkali washing and acidification treatment; and then mixing the wrinkled graphene oxide dispersion liquid subjected to alkali washing and acidification treatment and an acidic reducer, and conducting heating to obtain the single-layer wrinkled graphene. The single-layer wrinkled graphene is distributed in a single layer mode, a graphene nanosheet layer has a good wrinkled structure, and stacking of graphene nanosheet layers can be effectively inhibited, so that more fluffy graphene powder is obtained, and the density is small; and the wrinkled graphene powder is more liable to be filtered out from reduced dispersion liquid, so that the problem that in practical application, graphene powder is hard to separate out is solved, and production and the utilization rate of graphene are greatly improved.
Description
technical field [0001] The invention relates to the field of graphene materials, in particular to single-layer wrinkled graphene and its preparation method and application. Background technique [0002] Two-dimensional planar structure graphene has incomparable properties such as ultra-high electrical conductivity, excellent thermal conductivity and mechanical properties, and ultra-large theoretical specific surface area. It has shown great potential in the fields of environmental functional materials, electromagnetic shielding, electrode materials, and composite materials. Application prospects. The preparation of graphene oxide by chemical oxidation is the main way to prepare graphene in large quantities and cheaply. However, during the reduction process, the graphene oxide nanosheets are prone to stacking and agglomeration due to the strong interaction between the sheets, which reduces the ability of graphene Excellent material availability. [0003] The formation of wr...
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IPC IPC(8): C01B32/184
CPCC01B2204/02C01B32/184
Inventor 赖登国汪印陈笑笑许新海
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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