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

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...

AI Technical Summary

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 at a disadvantage in commercial competition

In addition, graphene films cannot maintain high thermal conductivity at low temperatures, making them difficult to apply in extreme environments

Therefore, solving the foaming problem of GO film during high temperature treatment, improving thermal conductivity and reducing production cost are the huge challenges to be faced in the preparation of thermal management materials at present.

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