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Dispersion solution of graphene nanosheet and preparation method of dispersion solution

A graphene nanosheet and dispersion technology, applied in the field of nanomaterials, can solve problems such as low efficiency and complicated process, and achieve the effects of low cost, simple and easy preparation method, and easy mass production.

Inactive Publication Date: 2015-06-03
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, the graphene obtained by peeling off is easy to adhere to each other and re-arrange to restore the layered structure.
Therefore, it is generally not possible to use ball milling, mortar, etc. to pulverize graphite alone to prepare graphene.
The existing mechanical exfoliation methods include A. the method of exfoliating by expanded graphite, and B. the method of exfoliating untreated graphite in various liquid solutions by ultrasonic treatment or ball milling, although both methods A and B can be obtained Graphene, but there are problems of complex process and low efficiency

Method used

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  • Dispersion solution of graphene nanosheet and preparation method of dispersion solution
  • Dispersion solution of graphene nanosheet and preparation method of dispersion solution

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Embodiment 1

[0033] The starch and solid graphite were mixed at a mass ratio of 139:1, and the mixture was added to a grinder for mechanical grinding. The grinding rotation number is 300r.p.m, and the grinding time is 24h, and a single-layer or several-layer graphene nanosheet material with a thickness of 0.35nm-7nm dispersed in the starch is obtained. 1 g of starch-graphene nanosheets was dissolved in 50 g of dimethyl sulfoxide DMSO, and the above solution was separated by centrifugation for 5 times to obtain a dispersion of graphene in DMSO.

Embodiment 2

[0035] Chitin and solid graphite are mixed at a ratio of 19:1, and the mixture is added to a grinder for solid-state mechanical grinding. The grinding rotation number is 200r.p.m, and the grinding time is 48h respectively, and the single-layer or several-layer graphene nanosheet material with a thickness of 0.35nm-7nm dispersed in chitin is obtained. Dissolving 1 g of chitin-graphene nanosheets in 50 g of hydrochloric acid solution, and centrifuging the dissolved chitin solution five times to obtain a dispersion of graphene in hydrochloric acid.

Embodiment 3

[0037] Same as Example 2, except that chitin is replaced by one of natural woody cellulose or natural herbal cellulose.

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Abstract

Provided are a graphene nanosheet dispersion and a preparation method therefor. In the dispersion, the graphene nanosheet has a thickness of 0.35 - 7 nm, and is dispersed in a solvent in the form of a single layer or multiple layers. The preparation method comprises the following steps: (1) mixing graphite with a solid polymer proportionally, and grinding mechanically to obtain a mixed powder of graphene nanosheets / solid polymer; (2) adding the mixed powder of graphene nanosheets / solid polymer into a solvent capable of dissolving the polymer, so as to obtain an intermediate of graphene nanosheet dispersion; and (3) removing the solid polymer dissolved in the solvent from the obtained intermediate of the dispersion, so as to obtain the graphene nanosheet dispersion. The polymer is used as a dispersion phase in the method and promotes the stripping of graphite during grinding so as to effectively inhibit the obtained graphene nanosheets from reaggregation. The method is simple and has a low cost.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a dispersion liquid of graphene nanosheets and a preparation method thereof. Background technique [0002] Graphene is a new carbonaceous material with a two-dimensional honeycomb crystal structure formed by stacking a single layer of carbon atoms. Graphite materials with a layered structure will be exfoliated to obtain flakes with layers ranging from 1 to 10 layers, which are called single-layer or several-layer graphene nanosheets. In recent years, graphene has attracted much attention due to its excellent properties in electrical, optical, and mechanical properties. The preparation of graphene is currently commonly divided into chemical vapor deposition (CVD), chemical synthesis (Bottom-up method), and Top-down method exfoliated from graphite. Among them, the Top-down method should be the most efficient and have few structural defects. [0003] Graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B32/19
Inventor 吴敏黄勇空闲重则孙佩佩
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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