Single-layer wrinkled graphene and its preparation method and use

A graphene and wrinkle technology, which is applied in the field of single-layer wrinkled graphene and its preparation, can solve the problems of needing substrate templates, high dependence, and high energy consumption of high-temperature thermal reduction, achieving simple and efficient methods, improving production efficiency, and suppressing stacking. stack effect

Active Publication Date: 2021-03-09
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

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 oxide on the base template, and create the wrinkled shape of the surface of the graphene sheet through the wrinkle of the template, which requires a base template and is cumbersome to operate

Method used

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  • Single-layer wrinkled graphene and its preparation method and use
  • Single-layer wrinkled graphene and its preparation method and use
  • Single-layer wrinkled graphene and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

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, its preparation method and application. The preparation method comprises the following steps: mixing and heating the graphene oxide dispersion liquid and the alkali solution to obtain the graphene oxide alkali dispersion solution; performing centrifugal separation and washing with water, and redispersing the solid precipitate in the hydrochloric acid solution to obtain the mixed solution Reheating and acidification, after cooling, centrifugal separation and water washing, the centrifuged solids are dispersed in water to obtain the wrinkled graphene oxide dispersion treated with alkali washing and acidification; then mixed with an acid reducing agent and heated to obtain single-layer wrinkled graphene. It is distributed in the form of a single layer, and the graphene nanosheets have a good wrinkled structure, which can effectively inhibit the stacking of graphene nanosheets, so as to obtain a more fluffy graphene powder with low density; wrinkled graphene powder is easier to It is filtered out from the reduced dispersion liquid, which solves the problem that graphene powder is difficult to separate in practical applications, and greatly improves the production capacity and utilization rate of graphene.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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