Thickness-controllable high-performance graphene film and preparation method thereof

A graphene film and graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as phonon scattering, disadvantages, and difficulty in application

Active Publication Date: 2021-06-18
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are always two problems in the prepared graphene thermal conductivity film: (1) the inherent foaming characteristics of the GO film during the heat treatment process will cause wrinkles and phonon scattering, which will affect its thermal conductivity; (2) the cost of GO raw materials Expensive, complex production process
This problem limits the large-scale industrial application of graphene membranes and is...

Method used

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  • Thickness-controllable high-performance graphene film and preparation method thereof
  • Thickness-controllable high-performance graphene film and preparation method thereof
  • Thickness-controllable high-performance graphene film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Structural unit research

[0032] (1) Evenly disperse graphene oxide and graphitizable polymer PAN in DMF, wherein the mass ratio of graphene oxide and graphitizable polymer PAN is 1:1; the mixed liquid-solid content is 1.02%.

[0033] (2) The mixture of graphene oxide and graphitizable polymer PAN is sprayed with a 50nm submicron film by means of centrifugal spraying. On the submicron membrane, a layer of 3nm polyvinyl alcohol (PVA) polymer was centrifugally sprayed. By spraying while drying (the drying temperature is 60°C), the submicron film and polyvinyl alcohol (PVA) layer are sprayed layer by layer to obtain a graphene film composite film with a thickness of 3 μm. After the membrane was removed, it was pre-oxidized at 270°C for 2 hours.

[0034] (3) A 1 μm high-performance graphene film was obtained after a 3 μm thick film was processed at a high temperature of 2800 ° C.

[0035] Through such layer-by-layer assembly and high temperature treatment ...

Embodiment 2

[0036] Embodiment 2: structural unit research

[0037] (1) Evenly dispersing graphene oxide and graphitizable polymer PAA in water, wherein the mass ratio of graphene oxide and graphitizable polymer PAN is 2 / 3; the solid content of the mixed liquid is 1.5%;

[0038] (2) The graphene oxide and graphitizable polymer PAA mixture is sprayed with a layer of 100nm submicron film by means of centrifugal spraying. On the submicron membrane, a layer of 5nm polyvinyl alcohol (PVA) polymer was centrifugally sprayed. By spraying while drying (the drying temperature is 60°C), the submicron film and polyvinyl alcohol (PVA) layer are sprayed layer by layer to obtain a graphene film composite film with a thickness of about 15 μm.

[0039] (3) Put the 15 μm composite film into a vacuum oven for thermal imidization, and treat it in the vacuum oven at 250° C. for 2 hours. A graphene-PI composite film is obtained, and the composite film is processed at a high temperature of 2800°C to obtain a h...

Embodiment 3

[0041] Embodiment 3: structural unit research

[0042] (1) Evenly dispersing graphene oxide and graphitizable polymer lignin in water, wherein the mass ratio of graphene oxide to graphitizable polymer PAN is 1.5; the solid content of the mixed liquid is 1.48%;

[0043] (2) The mixture of graphene oxide and graphitizable polymer lignin is sprayed with a layer of 200nm submicron film by means of centrifugal spraying. On the submicron membrane, a layer of 10nm polyvinyl alcohol (PVA) polymer was centrifugally sprayed. By spraying while drying (the drying temperature is 60° C.), the submicron film and polyvinyl alcohol (PVA) layer are sprayed layer by layer to obtain a graphene film composite film with a thickness of about 30 μm.

[0044] (3) Put the 30 μm composite film into an oven and dry at 60° C. for 12 hours. Graphene-lignin composite film, the composite film is processed at a high temperature of 2800 ° C to obtain a high-performance graphene film of about 20 μm.

[0045]...

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Abstract

The invention discloses a thickness-controllable high-performance graphene film and a preparation method thereof. The preparation method comprises the following steps: uniformly compounding graphene and a polymer by adopting a centrifugal spraying technology to construct a submicron graphene film, assembling the submicron graphene film serving as a structural unit and an adhesive layer by layer, and finally obtaining the graphene composite film with controllable thickness after high-temperature sintering. According to the invention, a multi-stage gas dissipation channel is constructed by utilizing different gas dissipation behaviors of various polymers, so that formation of micro-airbags in a traditional graphene film is avoided, and delamination structures are reduced. In addition, graphene can induce the polymer to form graphene; the polymer can promote AB stacking of graphene, and the polymer and the AB have a synergistic effect to jointly form a high-crystallinity graphene film. The material has excellent thermal conductivity, electrical conductivity and thermal stability, and can be applied to thermal homogenization of aerospace vehicles. In addition, the cost of the graphitizable polymer is far lower than that of graphene, so that the production cost for preparing the composite graphite film is greatly reduced.

Description

technical field [0001] The invention belongs to the field of heat-conducting films, in particular to a high-performance graphene film with controllable thickness. Background technique [0002] In the current period of rapid development of flexible electronic devices, 5G technology, and aerospace technology, the demand for thermal management materials has increased sharply. Thermal management materials can assist equipment to dissipate heat, maintain equipment stability and reliability, and prolong the service life of instruments. In devices with complex structures, graphite films with high flexibility and high thermal conductivity can effectively diffuse locally generated heat. For general polymers, the crystallinity of polymers is much lower than that of inorganic materials, and the degree of crystallization is not very good, and the internal crystal regions and amorphous regions are mixed. This makes the polymer itself have many interfaces, defects, etc., and its phonon s...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B32/184C01B2204/04C01B2204/22C01B2204/24C01B2204/30
Inventor 彭蠡罗诗雨黄昊光沈颖俞丹萍高超
Owner HANGZHOU GAOXI TECH CO LTD
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