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Method for preparing reduced graphene oxide heat conductive film

A heat-conducting film and graphene technology, applied in the field of carbon materials, can solve the problems of low graphene sheet orientation, many voids, and poor flexibility, and achieve the effect of easy industrial production, good flexibility, and smooth surface

Inactive Publication Date: 2015-07-01
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of reduced graphene oxide heat conduction film in order to solve the above-mentioned technical problems such as difficulty in keeping a large area intact after reduction of the graphene oxide film, poor flexibility, many voids, and low in-plane orientation of graphene sheets. The preparation method, the reduced graphene oxide film obtained by the preparation method has the characteristics of large area and integrity, good flexibility, less voids, high orientation degree of graphene sheets along the plane, and high thermal conductivity.

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  • Method for preparing reduced graphene oxide heat conductive film
  • Method for preparing reduced graphene oxide heat conductive film
  • Method for preparing reduced graphene oxide heat conductive film

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Embodiment 1

[0032] A method for preparing a reduced graphene oxide heat conduction film, specifically comprising the steps of:

[0033] (1) Add graphite oxide to deionized water, sonicate at 80W, 40KHz for 10min, centrifuge the suspension obtained after sonication at 3000rpm for 5min, take the supernatant in a vacuum drying oven at 80°C for 24h, and then grind to obtain oxidized Graphene;

[0034] Graphite oxide and deionized water consumption, by graphite oxide: deionized water is the ratio calculation of 1g:500mL; Described graphite oxide is prepared by improved Hummers method;

[0035] (2) Add 400mg of the graphene oxide obtained in step (1) into 200mL of solvent, ultrasonicate at 100W, 40KHz for 1h, and obtain a graphene oxide dispersion with a concentration of 2mg / mL;

[0036] Described solvent is the mixed solution that deionized water and ethanol are 1:1 composition by volume ratio;

[0037](3) Vacuum filter 30 mL of the graphene oxide dispersion obtained in step (2) with a mixed...

Embodiment 2

[0046] A method for preparing a reduced graphene oxide heat conduction film, specifically comprising the steps of:

[0047] (1) Add graphite oxide into deionized water, sonicate for 30min (80W, 40KHz), centrifuge the suspension obtained after sonication at 2500rpm for 10min, take the supernatant and dry it in a vacuum drying oven at 80°C for 24h, then grind to obtain Graphene oxide;

[0048] Graphite oxide and deionized water consumption, by graphite oxide: deionized water is the ratio calculation of 1g:800mL; Described graphite oxide is prepared by improved Hummers method;

[0049] (2) Add 200mg of graphene oxide obtained in step (1) into 200mL of solvent, and ultrasonically treat it for 1h (100W, 40KHz) to obtain a dispersion of graphene oxide with a concentration of 1mg / mL;

[0050] Described solvent is the mixed solution that deionized water and ethanol are 1:1 composition by volume ratio;

[0051] (3) Vacuum filter 20 mL of the graphene oxide dispersion obtained in step...

Embodiment 3

[0055] A method for preparing a reduced graphene oxide heat conduction film, specifically comprising the steps of:

[0056] (1) Add graphite oxide to deionized water, ultrasonicate at 80W, 40KHz for 10min, centrifuge the suspension obtained after ultrasonication at 2000rpm for 20min, take the supernatant and dry it in a vacuum drying oven at 80°C for 24h, then grind to obtain oxidized Graphene;

[0057] The amount of graphite oxide and deionized water is calculated according to the ratio of graphite oxide: deionized water is 1g:1000mL; the graphite oxide is prepared by the improved Hummers method;

[0058] (2) Add 400mg of the graphene oxide obtained in step (1) into 200mL of solvent, ultrasonicate at 100W, 40KHz for 1h, and obtain a graphene oxide dispersion with a concentration of 2mg / mL;

[0059] Described solvent is the mixed solution that deionized water and ethanol are 1:1 composition by volume ratio;

[0060] (3) Vacuum filter 40 mL of the graphene oxide dispersion ob...

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Abstract

The invention discloses a method for preparing a reduced graphene oxide heat conductive film. The method comprises the following steps: adding graphite oxide into the deionized water to perform ultrasonic treatment, centrifuging the obtained suspension solution for 5-20 min at the speed of 2000-3000 rpm, getting a supernate, drying and grinding to obtain the graphene oxide; and adding the obtained graphene oxide into a solvent to perform ultrasonic treatment to obtain a graphene oxide dispersed solution with the concentration of 1-5 mg / ml, performing vacuum filtration by a millipore filter, drying the obtained filter cake with the filter membrane, stripping the filter cake from the filter membrane, exerting the pressure of 0-10 MPa to the obtained graphene oxide, under the atmosphere of nitrogen, argon or helium, and processing for 2-8h at the temperature of 600-1000 DEG C to obtain the reduced graphene oxide heat conductive film with high heat conductivity, high reduction degree, high graphene lamellar surface inner orientation degree, smooth surface, good flexibility, wide curl degree without crack and small interlamellar spacing. The preparation method is simple and the reduced graphene oxide heat conductive film is easy for realization of industrial production.

Description

technical field [0001] The invention relates to a preparation method of a reduced graphene oxide heat conduction film, which belongs to the field of carbon materials. Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of closely arranged carbon atoms. Since its discovery, its special structure and excellent performance have attracted extensive attention from the material science and physics circles. Research in recent years has shown that graphene has an ultra-high in-plane thermal conductivity, with a value as high as 4800-6000W / m K, and has a good application prospect in improving the heat dissipation of high-power, integrated micro / nano devices . The two-dimensional film based on the oriented assembly of graphene sheets can give full play to its structural advantages, and can provide heat insulation in the thickness direction while dissipating heat in the sheet layer, which is conducive to its application in thermal mana...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 金双玲高倩金鸣林曾祥英张睿邵霞王占勇
Owner SHANGHAI INST OF TECH
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