High Thermal Conductivity Graphene Film Researched by Shanxi Coal Chemical Institute, Chinese Academy of Sciences

　 Shanxi Coal Chemical of the Chinese Academy of Sciences has made two major advances in the field of graphene flexible radiators this year. Recently, the institute systematically studied the thermal conductivity evolution mechanism of graphene oxide films during carbonization, and obtained high-performance thermal reduction graphene oxide films. Previously, they also successfully developed a highly thermally conductive graphene/carbon fiber flexible composite film with the relevant teams from Tsinghua University and the Institute of Metal Research of the Chinese Academy of Sciences.

Macro-assembling nanographene into thin-film materials while maintaining its nano-effects is an important way to scale up the application of graphene. Shanxi Coal Institute and related units build structural/functional integrated carbon/carbon composite films through self-assembly technology. This all-carbon film has a multi-stage structure similar to reinforced concrete, its thickness is controllable between 10 ~ 200μm, the thermal conductivity at room temperature is up to 977W/m · K, and the tensile strength exceeds 15MPa. This research solves the problem of heat conduction application of graphene and is a breakthrough in the field of graphene.

Thin film materials are readily available with graphene oxide as a precursor, but such materials require heat treatment to restore their thermal/electrical conductivity. The research results of Shanxi Coal Chemical Institute show that 1000 ℃ is the key point for the transformation of the properties of the film, and the properties of the film change qualitatively at this point. This discovery not only solves the basic scientific problem of graphene thermochemical transformation, but also provides a basis for the large-scale preparation of graphene thermal conductive films.

Graphene-based films can be used as flexible heat sink-oriented materials to meet the heat dissipation needs of high-power, highly integrated systems such as LED lighting, computers, satellite circuits, laser weapons, and handheld terminal equipment. These findings provide a fresh perspective on the design of structurally/functionally integrated carbon/carbon composites.