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|Graphite Nanoplatelet-Epoxy Composite Thermal Interface Materials|
|Keywords: thermal conductivity, graphite nanoplatelets, composites|
|Natural graphite was intercalated, thermally exfoliated and dispersed in acetone to prepare graphite nanoplatelets (GNPs, Gn) of controlled aspect ratio. Thermal conductivity measurements indicate that few graphene layer Gn, where n ~ 4, with a thickness of ~2 nm function as a very efficient filler for epoxy composites. When embedded in an epoxy matrix the G4 GNPs provide a thermal conductivity enhancement of more than 3000% (loading of ~25 vol%), and a thermal conductivity of 6.44 W/mK which far surpasses the performance of conventional fillers that require a loading of ~70 vol% to achieve these values. We attribute the outstanding thermal properties of this material to a favorable combination of the high aspect ratio, 2-D geometry, stiffness and low thermal interface resistance of the GNPs.|
|Aiping Yu, Student
University of California - Riverside