Preparation method of graphene water solution

A kind of olefin aqueous solution and graphene technology, applied in the direction of graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of unfavorable factors in the application of graphene, difficult to remove, etc., and achieve the effect of short time consumption and simple operation process

Active Publication Date: 2014-07-23
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these methods, the obtained graphene dispersion system often contains residual impurities such as surfactants, polymers, and chemical modification modifiers, which are difficult to remove, and are also unfavorable factors for the application of graphene.

Method used

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  • Preparation method of graphene water solution
  • Preparation method of graphene water solution

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Experimental program
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Embodiment 1

[0013] Example 1: Weigh 20 mg of reduced graphene oxide powder, 10 mg of graphene oxidized graphene quantum dot powder obtained by concentrated sulfuric acid or a mixed acid of concentrated sulfuric acid and concentrated nitric acid, wherein the carbon and oxygen atomic content ratio is 20 : 1, the average lateral dimension is about 10nm. The above two powders were added to 40 mL of deionized water to prepare a mixed suspension of graphene and graphene quantum dots, and the suspension was ultrasonically dispersed to obtain a stably dispersed graphene aqueous solution. The obtained graphene aqueous solution and its absorbance change with time are as follows: figure 2 (a) and (b), shown by figure 2 (b) It can be seen that the absorbance of the graphene aqueous solution does not change much with the extension of time. After standing still for 200 hours, the absorbance is basically unchanged, which shows that the graphene aqueous solution prepared according to the conditions o...

Embodiment 2

[0014] Example 2: Weigh 40 mg of reduced graphene oxide powder and 10 mg of graphene quantum dot powder, wherein the carbon and oxygen atomic content ratio is 20:1, and the average lateral size is about 25 nm. The above two powders are added to 40mL deionized water to prepare a mixed suspension of graphene and graphene quantum dots, and ultrasonically disperse the suspension to obtain a mixture with figure 2 (a) and (b) are similar to stable dispersed graphene aqueous solution.

Embodiment 3

[0015] Example 3: Weigh 80 mg of reduced graphene oxide powder, 20 mg of graphene oxide is thermally cut by DMF solvent method to obtain graphene quantum dot powder, wherein the carbon and oxygen atomic content ratio is 13:1, and the average lateral size is about 5nm. The above two powders are added to 40mL deionized water to prepare a mixed suspension of graphene and graphene quantum dots, and ultrasonically disperse the suspension to obtain a mixture with figure 2 (a) and (b) are similar to stable dispersed graphene aqueous solution.

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Abstract

The invention discloses a preparation method of a graphene water solution, which is characterized in that graphene quantum dots used as a dispersant and graphene sheets are subjected to non-covalent binding in a water solution to promote dispersion of the graphene in water, thereby obtaining the graphene water solution which can be dispersed stably. The technical scheme is as follows: the method comprises the following steps: (1) preparing a mixture of graphene powder and graphene quantum dot water to obtain a graphene suspension; and (2) mechanically dispersing the mixture to obtain the stable graphene water solution. Compared with the existing preparation technique of the graphene water solution, the method disclosed by the invention fully utilizes the dispersivity of the graphene quantum dots in water to assist in dispersing the graphene powder which can not be easily dispersed in water, thereby obtaining the stably-dispersed graphene water solution; and thus, the technique is simple. The method solves the problem that the surfactant, polymer and the like, which must be introduced to disperse the graphite powder in water in the past, are hard to remove; and the method is very suitable for mass production of the graphene water solution.

Description

technical field [0001] The invention relates to a preparation method of a graphene aqueous solution, which belongs to the technical field of new nanometer materials. Background technique [0002] Graphene is composed of a single layer of carbon atoms with sp 2 The nano-carbon material with a hexagonal lattice honeycomb structure formed by hybridization bonding belongs to a new type of two-dimensional crystal material. Graphene has good electrical conductivity, thermal conductivity, optical transparency, and special mechanical and electronic properties. It has good application prospects in energy storage, transparent conductive devices, composite materials, and optoelectronic devices. Therefore, graphene has become a research hotspot in many disciplines such as materials science, physics and chemistry. In terms of industrialization, the development of graphene products has also made remarkable progress in recent years due to the development of various preparation technologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184C01B32/194
Inventor 何朋丁古巧孙静田素云谢晓明江绵恒
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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