Wang Jiemin, Yang Tairan, Wang Zequn, Sun Xuhui, An Meng, Liu Dan, Zhao Changsheng, Zhang Gang, Lei Weiwei
College of Biomedical Engineering, Sichuan University, Chengdu, 610064, People's Republic of China.
Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Locked Bag 20000, Geelong, Victoria, 3220, Australia.
Nanomicro Lett. 2023 Jul 5;15(1):170. doi: 10.1007/s40820-023-01149-8.
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 W m K), low thermal contact resistance (~ 12 mm K W, 4-5 times lower than that of silver paste), strong yet sustainable adhesion forces (~ 4607 J m, 2220 J m 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 °C 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.
用于柔性和平面电子器件的前沿热扩散器不仅需要高导热性和一定程度的柔韧性，还需要在不使用热界面材料的情况下具有出色的自粘性、弹性、能随柔性器件任意伸长，以及具有热自修复、热致变色等智能特性。具有优异面内热耗散性能的类珍珠母复合材料是薄型和平面电子器件理想的热扩散器。然而，其固有的粘弹性较差，即粘附性和弹性不足，这使得它们无法与当前的柔性器件同时实现自粘性和任意伸长，并且会产生较高的界面热阻。在本文中，我们提出了一种具有层状结构、可观拉伸性、高面内热导率（约30 W m K）、低热接触电阻（约12 mm K W，比银浆低4 - 5倍）以及强大且可持续的粘附力（约4607 J m，比环氧胶浆大2220 J m）和自修复效率的软质热致变色复合材料（STC）膜。作为一种自粘性热扩散器，它能实现对各种柔性电子器件的高效冷却，与聚酰亚胺相比，温度可降低20°C。除了自修复功能外，STC类似变色龙的特性便于肉眼进行温度监测，从而实现智能热管理。
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