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Two-dimensional materials are characterised by a number of unique physicalproperties which can potentially make them useful to a wide diversity ofapplications. In particular, the large thermal conductivity of graphene andhexagonal boron nitride has already been acknowledged and these materials havebeen suggested as novel core materials for thermal management in electronics.However, it was not clear if mass produced flakes of hexagonal boron nitridewould allow one to achieve an industrially-relevant value of thermalconductivity. Here we demonstrate that laminates of hexagonal boron nitrideexhibit thermal conductivity of up to 20 W/mK, which is significantly largerthan that currently used in thermal management. We also show that the thermalconductivity of laminates increases with the increasing volumetric massdensity, which creates a way of fine-tuning its thermal properties.

High thermal conductivity of hexagonal boron nitride laminates