Hao Yutao, Li Qihan, Pang Xianhai, Gong Bohong, Wei Chengmei, Ren Junwen
College of Electrical Engineering, Sichuan University, Chengdu 610065, China.
College of Aviation Engineering, Civil Aviation Flight University of China, Guanghan 618307, China.
Materials (Basel). 2021 Sep 13;14(18):5251. doi: 10.3390/ma14185251.
Dielectric materials with high thermal conductivity and outstanding dielectric properties are highly desirable for advanced electronics. However, simultaneous integration of those superior properties for a material remains a daunting challenge. Here, a multifunctional epoxy composite is fulfilled by incorporation of boron nitride nanosheets (BNNSs) and mesoporous silica coated multi-walled carbon nanotubes (MWCNTs@mSiO). Owing to the effective establishment of continuous thermal conductive network, the obtained BNNSs/MWCNTs@mSiO/epoxy composite exhibits a high thermal conductivity of 0.68 W m K, which is 187% higher than that of epoxy matrix. In addition, the introducing of mesoporous silica dielectric layer can screen charge movement to shut off leakage current between MWCNTs, which imparts BNNSs/MWCNTs@mSiO/epoxy composite with high dielectric constant (8.10) and low dielectric loss (<0.01) simultaneously. It is believed that the BNNSs/MWCNTs@mSiO/epoxy composites with admirable features have potential applications in modern electronics.
具有高导热率和出色介电性能的介电材料对于先进电子学来说是非常理想的。然而，将这些优异性能同时集成到一种材料中仍然是一项艰巨的挑战。在此，通过掺入氮化硼纳米片（BNNSs）和介孔二氧化硅包覆的多壁碳纳米管（MWCNTs@mSiO）制备了一种多功能环氧复合材料。由于有效地建立了连续的热传导网络，所得的BNNSs/MWCNTs@mSiO/环氧复合材料表现出0.68 W m K的高导热率，比环氧基体高出187%。此外，介孔二氧化硅介电层的引入可以屏蔽电荷移动，切断MWCNTs之间的漏电流，这使得BNNSs/MWCNTs@mSiO/环氧复合材料同时具有高介电常数（8.10）和低介电损耗（<0.01）。据信，具有令人钦佩特性的BNNSs/MWCNTs@mSiO/环氧复合材料在现代电子学中具有潜在应用。
