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Self-assembly graphene nanometer thin film and preparing method and application thereof

A nano-film and graphene technology, applied in the field of materials, can solve the problems of polluting the environment, complex processes and equipment, and difficulty in preparing nano-scale graphene films.

Pending Publication Date: 2019-01-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process and equipment required by the above method are relatively complicated, and the film formation speed is slow, which limits the large-scale preparation of graphene films.
Moreover, the existing methods have problems such as difficulty in preparing nanoscale graphene films, high cost, and environmental pollution. The limitations of these methods force researchers to propose new methods for preparing graphene films.

Method used

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  • Self-assembly graphene nanometer thin film and preparing method and application thereof
  • Self-assembly graphene nanometer thin film and preparing method and application thereof
  • Self-assembly graphene nanometer thin film and preparing method and application thereof

Examples

Experimental program
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preparation example Construction

[0048] More specifically, the invention provides a kind of preparation method of self-assembled graphene nano film, comprises the steps:

[0049] 1) providing a first dispersion liquid, a second solvent and a substrate, wherein the first dispersion liquid comprises a first solvent and a graphene-like material dispersed in the first solvent;

[0050] 2) adding the first dispersion liquid dropwise to the second solvent at a first rate, and obtaining a thin layer of the graphene-based material at the liquid level of the resulting mixed liquid based on the Marangoni effect;

[0051] 3) transferring the thin layer of the graphene-based material obtained in step 2) onto the substrate, and drying the resulting product to obtain a self-assembled graphene nanofilm.

[0052] In the present invention, the mixing volume ratio of the first dispersion liquid and the second solvent is 1:200˜1:5.

[0053]It should be understood that, in the present invention, the ratio of the surface tension...

Embodiment 1

[0072] Embodiment 1 Graphene nano film 1

[0073] The electrochemically exfoliated graphene was mixed with ethanol to prepare a dispersion with a concentration of 0.5 mg / mL, and placed in an ultrasonic machine for 60 min. Take 20mL of the ultrasonically dispersed dispersion, slowly drop it into 200mL of water, and self-assemble on the water surface to form a uniform thin layer. The formed thin layer was transferred to a quartz substrate, and dried at 60° C. for 60 minutes to remove residual water and dispersant to obtain a self-assembled graphene nanofilm 1 .

[0074] figure 1 It is the scanning electron micrograph of embodiment 1 gained self-assembled graphene nano film 1.

[0075] From figure 1 It can be seen that graphene is spliced ​​into a relatively dense nanoscale film through self-assembly, and the coverage rate exceeds 99%.

[0076] figure 2 It is the Raman graph of the self-assembled graphene nanofilm 1 obtained in embodiment 1.

[0077] From figure 2 It can...

Embodiment 2

[0081] Embodiment 2 graphene nano film 2

[0082] The electrochemically exfoliated graphene was mixed with methanol to form a dispersion with a concentration of 1 mg / mL, and placed in an ultrasonic machine for 60 min. Take 10mL of the ultrasonically dispersed dispersion and slowly add it dropwise (for example, at a rate of 20mL / min) into 200mL of water, and self-assemble on the water surface to form a uniform thin layer. The formed thin layer was transferred to a glass substrate, and dried at 60° C. for 60 minutes to remove residual water and dispersant to obtain a self-assembled graphene nanofilm 2 .

[0083] The performance of the graphene nano-film 2 obtained in embodiment 2 is similar to that of the graphene nano-film 1 obtained in embodiment 1.

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Abstract

The invention relates to self-assembly graphene nanometer thin film and a preparing method and application thereof. The method specifically comprises the following steps of 1, providing first dispersing liquid, a second solvent and a substrate, wherein the first dispersing liquid comprises a first solvent and a graphene material dispersed in the first solvent; 2, dropwise adding the first dispersing liquid into the second solvent at a first speed, and based on the Marangoni effect, obtaining a thin layer of the graphene material on the liquid level of the obtained mixed liquid; 3, transferringthe obtained thin layer of the graphene material in step 2 into the substrate, and drying the obtained product to obtain the self-assembly graphene nanometer thin film. The invention further discloses the self-assembly graphene nanometer thin film prepared by means of the method and the application of the self-assembly graphene nanometer thin film. The method is quick, efficient, low in cost, safe, environmentally friendly, free of limitation on the substrate and capable of preparing the graphene nanometer thin film on a large scale. The graphene nanometer thin film is good in uniformity, high in light transmittance and excellent in electric conductivity.

Description

technical field [0001] The invention relates to the field of materials, in particular to a self-assembled graphene nano film and its preparation method and application. Background technique [0002] Since its discovery in 2004, graphene has attracted widespread attention for its excellent mechanical properties, electrical and thermal conductivity and other properties. Graphene has a very broad application prospect. Graphene film based on graphene sheet assembly is an important form for its application in macroscopic occasions. It has a wide range of applications in transparent conductive and heat-conducting films, lithium-ion battery negative electrodes, supercapacitors, etc. [0003] At present, the preparation methods of graphene-based thin films mainly include filtration method, electrophoretic deposition method, chemical vapor deposition method, epitaxial growth method, LB self-assembly film formation method and so on. The process and equipment required by the above met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01B13/00H01B13/30H01B5/14H01B1/04H05K9/00
CPCH05K9/0081H01B1/04H01B5/14H01B13/00H01B13/30C01B2204/22C01P2004/03C01P2002/82C01P2004/62
Inventor 林正得江南孙洪岩叶辰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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