A Thermochromic, Viscoelastic Nacre-like Nanocomposite for the Smart Thermal Management of Planar Electronics  

作　　者：Jiemin Wang Tairan Yang Zequn Wang Xuhui Sun Meng An Dan Liu Changsheng Zhao Gang Zhang Weiwei Lei 

机构地区：[1]College of Biomedical Engineering,Sichuan University,Chengdu 610064,People’s Republic of China [2]Institute for Frontier Materials,Deakin University,Waurn Ponds Campus,Locked Bag 20000,Geelong,Victoria 3220,Australia [3]College of Mechanical and Electrical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,People’s Republic of China [4]State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,People’s Republic of China [5]Institute of High Performance Computing A*STAR,Singapore 138632,Singapore

出　　处：《Nano-Micro Letters》2023年第10期182-196,共15页纳微快报（英文版）

基　　金：the financial support from the National Science Foundation of China (NSFC) (No.52103178);Science and Technology Project of Sichuan Province (No. 2023NSFSC0997);Sixth Two-hundred Talent B plan of Sichuan University;support by the Australian Research Council Discovery Program (DP190103290);Australian Research Council Future Fellowships (FT200100730, FT210100804)。

摘　　要：Cutting-edge heat spreaders for soft and planar electronics require not only high thermal conductivity and a certain degree of flexibility but also remarkable self-adhesion without thermal interface materials, elasticity, arbitrary elongation along with soft devices, and smart properties involving thermal self-healing, thermochromism and so on. Nacre-like composites with excellent in-plane heat dissipation are ideal as heat spreaders for thin and planar electronics. However, the intrinsically poor viscoelasticity, i.e., adhesion and elasticity, prevents them from simultaneous self-adhesion and arbitrary elongation along with current flexible devices as well as incurring high interfacial thermal impedance. In this paper, we propose a soft thermochromic composite(STC) membrane with a layered structure, considerable stretchability, high in-plane thermal conductivity(~30 Wm^(-1) K^(-1)), low thermal contact resistance(~12 mm^2 KW^(-1), 4–5 times lower than that of silver paste), strong yet sustainable adhesion forces(~4607 Jm^(-2), 2220 Jm^(-2) greater than that of epoxy paste) and self-healing efficiency. As a self-adhesive heat spreader, it implements efficient cooling of various soft electronics with a temperature drop of 20℃ than the polyimide case. In addition to its self-healing function, the chameleon-like behavior of STC facilitates temperature monitoring by the naked eye, hence enabling smart thermal management.

关 键 词：Boron nitride nanosheets Nacre-inspired composites VISCOELASTIC THERMOCHROMIC Smart thermal management 

分 类 号：TB33[一般工业技术—材料科学与工程]