TY - JOUR A1 - Levy, Idan A1 - Wormser, Eyal Merary A1 - Varenik, Maxim A1 - Buzaglo, Matat A1 - Nadiv, Roey A1 - Regev, Oren T1 - Graphene–graphite hybrid epoxy composites with controllable workability for thermal management JF - Beilstein Journal of Nanotechnology PY - 2019/// VL - 10 SP - 95 EP - 104 SN - 2190-4286 DO - 10.3762/bjnano.10.9 PB - Beilstein-Institut JA - Beilstein J. Nanotechnol. UR - https://doi.org/10.3762/bjnano.10.9 KW - hybrid composites KW - nanocomposites KW - rheology KW - thermal interface material KW - thermal properties N2 - The substantial heat generation in highly dense electronic devices requires the use of materials tailored to facilitate efficient thermal management. The design of such materials may be based on the loading of thermally conductive fillers into the polymer matrix applied – as a thermal interface material – on the interface between two surfaces to reduce contact resistance. On the one hand, these additives enhance the thermal conductivity of the composite, but on the other hand, they increase the viscosity of the composite and hence impair its workability. This in turn could negatively affect the device–matrix interface. To address this problem, we suggest a tunable composite material comprising a combination of two different carbon-based fillers, graphene nanoplatelets (GNPs) and graphite. By adjusting the GNP:graphite concentration ratio and the total concentration of the fillers, we were able to fine tune the thermal conductivity and the workability of the hybrid polymer composite. To facilitate the optimal design of materials for thermal management, we constructed a ‘concentration–thermal conductivity–viscosity phase diagram’. This hybrid approach thus offers solutions for thermal management applications, providing both finely tuned composite thermal properties and workability. We demonstrate the utility of this approach by fabricating a thermal interface material with tunable workability and testing it in a model electronic device. ER -