3 years ago

Ultrahigh Performance Heat Spreader based on Gas-Liquid Exfoliation Boron Nitride Nanosheets.

Wang, Ding, Zhao, Peng, Yu
Due to its high thermal conductivity, insulation performance, boron nitride nanosheets (BNNS) have a great promising to fabricate thermal management equipments for application in power electronics. Liquid-phase exfoliation route has been regarded as the most commonly used approach to produce single and few-layered BNNS for many research fileds. However, this process has been slow, and the production yield is extremely low. In this work, an efficient technique to obtain few-layered (mostly < 5 layers), high-yield (~33%), and plane-defect-free BNNS by the combination of liquid N2 (L-N2) gasification and liquid exfoliation was developed. The as-obtained BNNS suspensions could be vacuum filtered to make a thermal conductive film. The as-prepared heat spreader of BNNS possessed an surperior thermal conductivity of 61.2 W m-1 K-1 at room temperature. In addition, we also proved that the thermal conductivity of BNNS heat spreader increased with the increasing density, creating an approach for fine tuning the thermal property of this heat spreader.

Publisher URL: http://doi.org/10.1088/1361-6528/aa8e3d

DOI: 10.1088/1361-6528/aa8e3d

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