Research progress of graphene thermal conductive materials

Graphene film can be used as a radiator in electronic components. The radiator is usually attached to the surface of electronic components that are easy to heat. In the past, graphene film has been the most ideal choice of thermally conductive film for a long time.

Graphene is a carbon-containing six-membered ring structure with an SP2 hybrid structure, and its physical and chemical properties are very stable. Compared with traditional metal materials such as copper and aluminum, graphene has higher in-plane thermal conductivity. Because of its special structure, graphene has a lower density, good thermal stability, ultra-high conductivity, excellent light transmittance, and better mechanical properties. Graphene is an ideal choice as an additive of thermally conductive material. At the same time, graphene film can be used as a radiator in electronic components, which is bonded to the surface of electronic components easy to heat, to evenly disperse the heat generated by the heat source. Among them, the artificial graphite thermal conductive film obtained from polyimide film through the graphite process has the highest thermal conductivity and the best heat dissipation effect. The thermal conductivity in-plane direction can reach 700 ~ 1950W ∙ M-1 ∙ k-1, and the thickness is 10 ~ 100 μ m. It has a good heat conduction effect.

With the development of large-scale preparation technology of graphene, the thermal conductivity of high thermal conductivity graphene film prepared based on the graphene oxide method can reach 2000W ∙ M-1 ∙ k-1. The thermal conductivity of high thermal conductivity graphene film is equivalent to that of high-quality graphitized polyimide film in industrial applications and has lower cost and better thickness controllability. At the same time, graphene, as a two-dimensional heat conduction filler, it easy to construct a three-dimensional heat conduction network in the polymer matrix, which has a good application prospect in thermal interface materials. By improving the dispersion of graphene in the polymer matrix and constructing a three-dimensional graphene heat conduction network, the thermal conductivity of graphene-filled thermal interface composite is several times higher than that of polymer, and the filler ratio is lower than that of traditional heat conduction filler. Graphene, whether as a self-supporting thermal conductive film or as a thermally conductive filler of thermal interface material, will play an important role in the heat dissipation application of next-generation electronic components.

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