Achieving highly anisotropic thermal and electrical conductivities via synergistic distribution of boron nitride and graphene nanosheets in multilayered composites

Abstract

It has long been a challenging problem to fabricate polymeric composites that could combine high thermal conductivity, electrical insulating and anti-static capacity. Dirven by the fascinating features of multilayer structure in nature, here we report a series of multilayered boron nitride/graphene nanoplate (BN/GNP) composites by virtue of a sequentially layered assembly strategy, which is realized through unidirectional freezing drying followed by alternative compression molding. Due to the high orientation state, as well as the synergistic distribution of BN and GNP in multilayered pattern, the compositing BN/GNP film with optimized filler content displays a satisfying in-plane thermal conductivity of 21.9 W m−1 K−1, which is 6161 % and 669 % higher than that of pure CS and isotropic composite, respectively. Meanwhile, the qualification of such compositing film in factual dissipation of exhaust heat generated by complex electronic devices is further explored and demonstrated. Moreover, such compositing film possesses distinct anisotropic electrical performance, which could simultaneously satisfy the requirement of through-plane insulating and in-plane antistatic property. Given such superior performance, as well as the green and facile process, such work is believed to further inspire the design and fabrication of intelligent electronic device with excellent heat dissipation capacity.