Self-Modifying Nanointerface Driving Ultrahigh Bidirectional Thermal Conductivity Boron Nitride-Based Composite Flexible Films

• DOI: 10.1007/s40820-022-00972-9
• Publication Date: 2022-11-28T15:11:45Z
• Authors: Taoqing Huang; Xinyu Zhang; Tian Wang; Honggang Zhang; Yongwei Li; Hua Bao; Min Chen; Limin Wu
• Keywords: Phonon scattering

While boron nitride (BN) is widely recognized as the most promising thermally conductive filler for rapidly developing high-power electronic devices due to its excellent thermal conductivity and dielectric properties, a great challenge poor vertical when embedded in composites owing interfacial interaction causing severe phonon scattering. Here, we report novel surface modification strategy called "self-modified nanointerface" using BN nanocrystals (BNNCs) efficiently link interface between polymer matrix. Combining with ice-press assembly method, an only 25 wt% BN-embedded composite film can not possess in-plane of 20.3 W m-1 K-1 but also, more importantly, achieve through-plane high 21.3 K-1, which than twice reported maximum ideal spectrum matching BNNCs fillers, strong self-modified fillers matrix, well ladder-structured skeleton. The has been verified by theoretical calculations heat dissipation CPU. This study provides innovative design principle tailor interfaces opens up new path develop high-performance composites.