With the increasing degree of integration of electronic devices,higher requirements are put forward for the thermal conductivity of thermal management materials.Graphene has a high in-plane thermal conductivity,and the gra-phene film made of stacked graphene microsheets has a high in-plane thermal conductivity,but low thermal conductivity a-long thickness direction.Carbon nanotubes have similar crystal structure to graphene,and the axial thermal conductivity of carbon nanotubes is high.In this paper,aluminum oxide particles,catalyst ferrocene and carbon source PMMA were intro-duced into the layers of graphene oxide thin films.During the thermal reduction of graphene oxide thin films,carbon nano-tubes were grown in situ to form a multi-dimensional structure graphene-carbon nanotube composite film containing alu-minum oxide particles,one-dimensional carbon nanotubes and two-dimensional graphene.Among them,two-dimen-sional graphene sheets provide high in-plane thermal conductivity,and one-dimensional carbon nanotubes growing along the thickness of graphene films(interlayer)provide high thickness directional thermal conductivity.Alumina particles as a high thermal conductivity filler,further improve the overall thermal conductivity of graphene film;At the same time,as a substrate for efficient in-situ growth of carbon nanotubes,alumina particles significantly improve the growth efficiency of carbon nanotubes,increase the content of carbon nanotubes in graphene film,and significantly improve the thermal conduc-tivity of graphene film.Results show that the in-plane thermal conductivity of composite film with thickness of 50 μm is 1006±32 W/mk,and the thickness direction thermal conductivity is 7.30±0.16 W/mk.
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维普
