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A kind of graphene crystal film with high electrical conductivity and preparation method thereof

A graphene, high-conductivity technology, applied in graphene, cable/conductor manufacturing, conductors and other directions, can solve the problems of low output, difficult scale, limited application, etc. Effect

Active Publication Date: 2021-01-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conductivity of the commonly used pure copper conductor at room temperature is 5.9×10 7 Compared with S / m, the electrical quality of graphene obtained by the above method is low, which limits its application in the field of electricity
[0012] This brief introduction to the above situation shows that the preparation of "current technology level" graphene still limits its application in the field of electricity. The electrical quality of graphene prepared by some existing technologies is low, and the cost of graphene prepared by other existing technologies High, low output, difficult to scale

Method used

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  • A kind of graphene crystal film with high electrical conductivity and preparation method thereof
  • A kind of graphene crystal film with high electrical conductivity and preparation method thereof
  • A kind of graphene crystal film with high electrical conductivity and preparation method thereof

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Embodiment 1

[0043] see figure 1 , the present embodiment discloses a method for preparing a graphene crystal film with high electrical conductivity, which has a high efficiency in the conversion process of organic polymers to graphene induced by micro-nano-scale metal particle catalysts and laser irradiation, and the product graphene The crystal quality is high, and at the same time, due to the reduction of graphene, the oxidation of metal particles is avoided, so that the reaction can be carried out in an air atmosphere, and the final product graphene crystal film is still combined with metal particles, which can be graphene crystals The thin film provides a large number of free electrons, combined with the extremely high electron mobility of graphene itself, it can finally achieve extremely high electrical conductivity.

[0044] The preparation method of graphene crystal film comprises the following steps:

[0045] a. Preparation of organic polymers containing micro-nano-scale metal ca...

Embodiment 2

[0057] According to the description of the embodiment, copper particles with an average diameter of 20 nm are selected as the catalyst, and polyimide is selected as the organic polymer. First, use pyromellitic dianhydride and 4,4'-diaminodiphenyl ether as synthetic raw materials to prepare the precursor of polyimide, that is, polyamic acid solution: measure 4mmol / L 4,4'-diaminodiphenyl ether Dissolve diphenyl ether in 15ml / L N-methylpyrrolidone, add 2mmol / L pyromellitic dianhydride, add the remaining 2mmol / L pyromellitic dianhydride after it is fully dissolved for 20min, and keep stirring for 30min, the solution Become viscous to obtain a polyamic acid solution; then, add copper particles with a diameter of 20nm to 50nm to the above polyamic acid solution to form a mixed solution, the mass fraction of copper particles is 1% to 2%, and stir for 60min.

[0058] In this example, first use pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (ODA) as synthetic raw materi...

Embodiment 3

[0062] The preparation method of the graphene crystal thin film in this embodiment is the same as that in Embodiment 2, the mass fraction of copper nanoparticles added is 2%, and the rest of the conditions are the same as in Embodiment 2. The conductivity of the prepared graphene crystal film can be as high as 5.1×10 7 S / m.

[0063] Image 6 It is a transmission electron microscope photo of the graphene crystal thin film prepared in this embodiment. It can be seen from the figure that the copper nanoparticles are more densely distributed in the graphene, and the content is larger, so the conductivity is larger.

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Abstract

The invention discloses a graphene crystal film with high conductivity and a preparation method thereof. The graphene crystal film is formed by subjecting an organic polymer containing micro-nano-sized metal catalyst particles to laser irradiation. The mass ratio of the metal catalyst particles to the organic polymer is 1:1 to 1:10000. The micro-nano-sized metal particles induce a conversion process from polymer to graphene, provide a large number of free electrons for the graphene crystal film, and finally achieve extremely high conductivity in combination with the extremely high electron mobility of graphene, thereby improving the quality of the graphene. In addition, the reduction of graphene avoids the oxidation of the metal particles under laser irradiation so that the reaction can becarried out under an air atmosphere and the preparation process of the graphene crystal film is simple and easy. The graphene crystal film prepared by the method has excellent performance, simple operation and easy availability of raw materials, and can meet the requirements of different applications, especially in the field of electronic devices. Thus, the graphene crystal film is convenient forpopularization.

Description

technical field [0001] The invention relates to a graphene film material and a preparation method thereof, in particular to a graphene crystal film with high conductivity and a preparation method thereof. Background technique [0002] In 2004, Professor A.Geim and others first used the micromechanical exfoliation method to separate single-layer graphene. As a new material, graphene has excellent properties in the fields of electronics, optics, chemistry, mechanics and thermals. , so it has received extensive attention from all walks of life. Among them, the research on electrical properties is more notable, which has opened up a new direction for the development of next-generation electrical devices. The carbon atoms in graphene form a hexagonal honeycomb structure in the form of sp2 hybrid orbitals, which is a two-dimensional thin film material. There are three strong σ bonds and one π bond between carbon atoms in the graphene lattice structure, which runs through the ent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01B1/04H01B5/00H01B5/14H01B13/00C01B32/184
Inventor 王振洋张淑东李年刘翠张忠平蒋长龙刘变化
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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