Construction of Oriented Interconnected BNNS Skeleton by Self‐Growing CNTs Leading High Thermal Conductivity

• DOI: 10.1002/admi.202001910
• Publication Date: 2021-01-21T18:29:50Z
• Authors: Xu Li; Bin Wu; Ya Li; Md Mofasserul Alam; Peng Chen; Ru Xia; Cheng‐Te Lin; Jiasheng Qian
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

AbstractThe development of thermal conduction polymer‐based composites is important to solve the heat dissipation of electronic instruments under overheating conditions. The construction of thermal conductive pathways in composites and the reduction of contact resistance between fillers are crucial for concerning excellent thermal conduction properties. Herein, the oriented coherent thermal conductive network in composites is successfully developed via the in situ growth of carbon nanotubes (CNTs) into boron nitride nanosheets (BNNSs) skeleton prepared from ice‐templated. The thermal conductivity of composites reaches 3.21 W m−1 K−1 approximately low filler loading of 9.86 vol%, due to the formation of the covalent bonding between CNTs and BNNSs as reducing the thermal contact resistance by one order of magnitude. More importantly, non‐equilibrium molecular dynamics (NEMD) simulations are carried out to demonstrate the influence of CNTs in elevating the heat conductivity between BNNSs. Meanwhile, the volume resistivity of composites up to 1015 Ω cm far met the requirement of electrical insulation. This study provided a valuable idea for the design of thermal management materials for potential applications in integrated circuits.