Flexible yet impermeable composites with wrinkle structured BNNSs assembling for high-performance thermal management  

作　　者：Guilei Guo Yijie Liu Yafei Ding Wenjie Liu Guimei Zhu Xiaoli Hao Xingyi Huang Jianfei Xia Baowen Li Tong-Yi Zhang Bin Sun 

机构地区：[1]College of Electronics and Information,Qingdao University,266071 Qingdao,PR China [2]Department of Polymer Science and Engineering,Shanghai Key Laboratory of Electrical Insulation and Thermal Aging,Shanghai Jiao Tong University,200240 Shanghai,PR China [3]School of Electrical Engineering,Southwest Jiaotong University,611756 Chengdu,China [4]Department of Materials Science and Engineering,Southern University of Science and Technology,518055 Shenzhen,PR China [5]School of Microelectronics,Southern University of Science and Technology,518055 Shenzhen,PR China [6]College of Chemistry and Chemical Engineering,Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials,Instrumental Analysis Center of Qingdao University,Qingdao University,266071 Qingdao,PR China [7]Department of Physics,Southern University of Science and Technology,518055 Shenzhen,PR China [8]Guangzhou Municipal Key Laboratory of Materials Informatics,Sustainable Energy and Environment Thrust,Advanced Materials Thrust,Hong Kong University of Science and Technology(Guangzhou),511400 Guangzhou,PR China [9]Weihai Innovation Research Institute of Qingdao University,264200 Weihai,PR China

出　　处：《npj Flexible Electronics》2024年第1期568-576,共9页npj-柔性电子(英文)

基　　金：supported by the Natural Science Foundation of Shandong Province(ZR2020ME193)。

摘　　要：Efficient thermal management has becomeone of the most critical issues of electronics because of the high heat flux generated from highly integrated,miniaturized,and increased power.Here we report highly flexible composites with aligned and overlapping interconnected boron nitride nanosheets(BNNSs)assembled in wrinkle structures.Besides high in-plane thermal conductivity of more than 26.58Wm^(−1) K^(−1),such structure rendered enhanced through-plane conduction along with increasing pre-stain.As thermal interface materials(TIMs)of both rigid and flexible devices,the composites revealed an outstanding thermal cooling capability outperforming some commercial TIMs.During a record-long bending process of more than 3000 cycles,the maximum temperature fluctuation of the flexible device with 100%-prestrained composite was only within 0.9℃,less than one-third of that with commercial thermal pad.Moreover,the composite revealed a superior impermeability for flexible seals.Our results illustrate that the composites could be an ideal candidate for the thermal management of emerging flexible electronics.

关 键 词：COMPOSITES composite thermal 

分 类 号：TB3[一般工业技术—材料科学与工程]