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Preparation method of efficient heat-conducting composite graphene oxide film

A graphene film and composite oxidation technology, which is applied in the field of preparation of composite graphene oxide films, can solve problems such as insufficient utilization of mechanical properties of graphene films, and achieve controllable performance and thickness, improved thermal conductivity, and low cost. Effect

Inactive Publication Date: 2020-05-05
NANJING XINYUE MATERIAL SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the preparation methods of graphene films, vapor deposition and redox methods are the most common methods, and the obtained graphene films have good electrical conductivity, thermal conductivity and mechanical strength; currently, graphene films are widely used in composite films, such as Combining graphene oxide with polymers such as polyvinyl alcohol (PVA) and compounding with ionic liquids to form thin films are the main research directions of graphene oxide composite thin films, but they still stick to the good properties of polymer materials themselves. The preparation of blending does not involve the use of a small amount of small molecules to form covalent bonds to strengthen the force between graphene layers, and these composites form a single-layer graphene composite film, which makes the graphene film good. Mechanical properties are not fully utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, 1,8-octanediamine was used as the solute of the coagulation solution to prepare a composite film. The preparation process is as follows:

[0026] Equipped with composite graphene oxide mixed solution: graphene oxide is made from graphite by traditional hummers method or improved hummers method: mix and dissolve 200mg freeze-dried GO powder, 15mg nano-tin powder, and 30mg carbon nanotubes Put it into 40ml of distilled durian water, ultrasonically disperse for 1h, make it fully dispersed, and form a 6.125mg / mL composite graphene oxide mixed aqueous solution;

[0027] Equipped with coagulation solution: Dissolve 5mg of 1,8-octanediamine in 50ml of distilled water, and disperse it by ultrasonic for 10 minutes to fully disperse it to form a coagulation solution of 0.1mg / mL;

[0028] Apply the above-mentioned graphene oxide aqueous solution to the substrate, wherein the substrate material is a glass substrate of 60mm*30mm*2mm, immerse the glass substrate with...

Embodiment 2

[0030] In this embodiment, ethanol is used as coagulation liquid solute to prepare a composite film, and the preparation process is as follows:

[0031] Equipped with composite graphene oxide mixed solution: Graphene oxide is made from graphite by traditional hummers method or improved hummers method: 200mg freeze-dried GO powder, 15mg nano-silver powder, and 30mg carbon nanotubes are mixed and dissolved in 40ml of distilled durian water, ultrasonic dispersion for 1h, so that it is fully dispersed to form a 6.125mg / mL composite graphene oxide mixed aqueous solution;

[0032] Equipped with coagulation solution: Dissolve 5mg of ethanol in 50ml of distilled pomegranate water, ultrasonically disperse for 10 minutes to fully disperse, and form a 0.1mg / mL coagulation solution;

[0033] Apply the above-mentioned graphene oxide aqueous solution to the substrate, wherein the substrate material is a glass substrate of 60mm*30mm*2mm, immerse the glass substrate with the composite graphen...

Embodiment 3

[0035] In this example, biphenylenediamine is used as coagulation liquid solute to prepare a composite film, and the preparation process is as follows:

[0036] Equipped with composite graphene oxide mixed solution: graphene oxide is made from graphite by traditional hummers method or improved hummers method: 200mg freeze-dried GO powder, 15mg nano-copper powder, 30mg carbon nanotubes are mixed and dissolved Put it into 40ml of distilled durian water, ultrasonically disperse for 1h, make it fully dispersed, and form a 6.125mg / mL composite graphene oxide mixed aqueous solution;

[0037] Equipped with coagulation solution: Dissolve 5mg of biphenyldiamine in 50ml of distilled water, and disperse it by ultrasonic for 10min to fully disperse it to form a coagulation solution of 0.1mg / mL;

[0038] Apply the above-mentioned graphene oxide aqueous solution to the substrate, wherein the substrate material is a glass substrate of 60mm*30mm*2mm, immerse the glass substrate with the compo...

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PUM

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Abstract

The invention provides a preparation method of an efficient heat-conducting composite graphene oxide film. The preparation method comprises the following steps: firstly, coating a substrate with a mixed dispersion liquid of graphene oxide water / nanoscale metal powder / carbon nanotubes; immersing the substrate mixed with the dispersion liquid into the solidification liquid, then taking out the substrate for drying, repeatedly coating the substrate with the mixed dispersion liquid of graphene oxide water / nanoscale metal powder / carbon nanotubes, immersing the substrate into the solidification liquid, taking out the substrate, drying, repeating the process, and obtaining a thin film with a corresponding layer number according to needs. In the process, groups on the graphene oxide and groups inthe solidification liquid spontaneously form covalent bonds or ionic bonds for fast cross-linking self-assembly, and graphene sheet layers which are naturally stacked originally are connected togetherby utilizing bond energy; and the heat conductivity coefficient of the graphene film in the Z direction is greatly improved due to the addition of the nanoscale metal powder and the carbon nanotubes,so that the efficient heat-conducting composite graphene oxide film is obtained, and the performance and the thickness of the film are controllable due to the repeated process. The preparation methoddisclosed by the invention is simple to operate and low in cost, and the obtained composite film has high mechanical properties and can realize mass production.

Description

technical field [0001] The invention belongs to the technical field of graphene composite materials, and in particular relates to a preparation method of a composite graphene oxide film with high thermal conductivity. Background technique [0002] Graphene is a substance composed of carbon atoms arranged in a hexagonal arrangement with a single atomic layer thickness in a two-dimensional plane. It has excellent properties such as high charge mobility, high mechanical strength, and high surface area. It is used in thin-film solar cells, flat panel display electrodes, It has a wide range of applications in capacitors, electric carp, and enhancement of mechanical strength of coatings. [0003] Vapor deposition and redox methods are the most common methods for preparing graphene films, and the obtained graphene films have good electrical conductivity, thermal conductivity and mechanical strength; currently, graphene films are widely used in composite films, such as Combining gr...

Claims

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Application Information

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IPC IPC(8): C03C17/00
CPCC03C17/007C03C17/008
Inventor 闵永刚刘屹东简凌峰
Owner NANJING XINYUE MATERIAL SCI & TECH