Graphene-based thermal conductive film preparing method

A graphene film and thermally conductive film technology, applied in the field of preparing graphene-based thermally conductive films, can solve the problems affecting the working stability and safety and reliability of electronic devices, the influence of graphene-based film thermal conductivity, strong corrosion, etc., and achieve molding Simple and controllable process, easy mass production, smooth temperature gradient effect

Inactive Publication Date: 2015-10-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at the same time, an important problem is that the equipment generates a lot of heat during operation. If the heat is not removed in time, it will seriously affect the working stability and safety reliability of electronic devices.
The key technology for preparing graphene-based thermally conductive films is to reduce graphene oxide. The current methods for reducing graphene oxide mainly include: (1) Thermal reduction. However, this method has relatively high requirements for the furnace, because the general processing of samples It needs to be at 1000°C, even as high as 2000°C, and it consumes energy; (2) solution chemical reduction, the reduction reagents used in this method are generally sodium borohydride, hydrazine hydrate, hydrogen iodide, and these reagents have strong Toxicity or strong corrosion; (3) hydrothermal reduction, this method needs to be carried out under high temperature and high pressure, and the prepared samples are extremely easy to agglomerate, once agglomeration occurs, the thermal conductivity of graphene-based films will be reduced greatly affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Make graphite oxide into a hydrosol with a concentration of 0.5 mg / mL, and obtain graphene oxide (GO) hydrosol through ultrasonication, remove the core of jujube and crush it, mix and dilute it with deionized water to obtain biomaterial slurry, slurry The concentration of the material is 1 mg / mL; the obtained biomaterial slurry is ultrasonically filtered to obtain the filtrate, which is sealed for use; the above biomaterial filtrate is mixed with graphene oxide sol, wherein the mass ratio of slurry to graphite oxide is 1 : 5, let the mixed solution react at 25°C for 48h, and naturally evaporate and dry to form a film after the reaction is completed. The specific method is as follows: pour the reduced graphene oxide solution into a flat-bottomed open container with a certain depth, and then Under room temperature conditions, let its liquid volatilize, make the remaining graphene oxide sheets assemble into a film, wherein the amount of graphene oxide contained in the solut...

Embodiment 2

[0025] Graphite oxide was formulated into a hydrosol with a concentration of 1.0 mg / mL, and graphene oxide (GO) hydrosol was obtained by ultrasonication, crushed kiwi fruit, mixed and diluted with deionized water to obtain a biomaterial slurry, the slurry The concentration is 2 mg / mL; the obtained biomaterial slurry is ultrasonically filtered to obtain the filtrate, which is sealed for use; the above biomaterial filtrate is mixed with graphene oxide sol, wherein the mass ratio of slurry to graphite oxide is 1:6 , allowing the mixed solution to react at 40° C. for 46 hours, and evaporate and dry naturally to form a film after the reaction is completed. The specific method is as follows: the reduced graphene oxide solution is poured into a flat-bottomed open container with a certain depth, and then at room temperature, the liquid is volatilized, so that the remaining graphene oxide sheets are assembled into a film, wherein The amount of graphene oxide contained in the solution (...

Embodiment 3

[0027] Make graphite oxide into a hydrosol with a concentration of 1.5mg / mL, and obtain graphene oxide (GO) hydrosol through ultrasonication, crush the unevenness, mix and dilute it with deionized water to obtain a biomaterial slurry, slurry The concentration of the material is 3.5mg / mL; the obtained biomaterial slurry is ultrasonically filtered to obtain its filtrate, which is sealed for use; the above biomaterial filtrate is mixed with graphene oxide sol, wherein the mass ratio of slurry and graphite oxide is 1:7, let the mixed solution react at 60°C for 40 hours, and evaporate and dry naturally to form a film after the reaction is completed. The specific method is as follows: the reduced graphene oxide solution is poured into a flat-bottomed open container with a certain depth, and then at room temperature, the liquid is volatilized, so that the remaining graphene oxide sheets are assembled into a film, wherein The amount of graphene oxide contained in the solution (mg): th...

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Abstract

The invention provides a graphene-based thermal conductive film preparing method which includes the steps that biological materials are stirred and squeezed broken, and a solvent is added to the biological materials to dilute the materials; ultrasonic suction filtration is conducted on the obtained biological material pulp, and filter liquor of the biological material pulp is obtained and sealed for use; ultrasound is conducted on a graphite oxide solution, and oxidized graphene sol is obtained; the biological material filter liquid is mixed with the oxidized graphene sol, the mixed solution is made to react, and a reduced graphene film is obtained; the thermal annealing is conducted on the obtained film under the conditions of the inert atmosphere and low temperature, and the high-thermal-conductive graphene film is obtained. The graphene film prepared through the method has the advantages of being thermal conductive, electric conductive, good in mechanical property, controllable in thickness, wide in raw material source and capable of achieving batch production easily.

Description

technical field [0001] The invention belongs to a method for preparing a heat-conducting film, in particular to a method for preparing a graphene-based heat-conducting film. Background technique [0002] In recent years, with the rapid development of science and technology, the design of instruments and equipment has become more and more obvious in the characteristics of lightness, thinness, shortness, smallness and high efficiency. However, at the same time, an important problem is that the equipment generates a lot of heat during operation. If the heat is not removed in time, it will seriously affect the working stability, safety and reliability of electronic devices. The key technology for preparing graphene-based thermally conductive films is to reduce graphene oxide. The current methods for reducing graphene oxide mainly include: (1) Thermal reduction. However, this method has relatively high requirements for the furnace, because the general processing of samples It ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 吕春祥陈成猛宋宁静蔡榕
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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