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

journal contribution
posted on 2023-07-14, 01:46 authored by Jiemin Wang, Tairan Yang, Zequn Wang, Xuhui Sun, Meng An, Dan LiuDan Liu, Changsheng Zhao, Gang Zhang, Weiwei LeiWeiwei Lei
AbstractCutting-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−1 K−1), low thermal contact resistance (~ 12 mm2 K W−1, 4–5 times lower than that of silver paste), strong yet sustainable adhesion forces (~ 4607 J m−2, 2220 J m−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 °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.

History

Journal

Nano-Micro Letters

Volume

15

Article number

170

Pagination

170-

Location

Germany

ISSN

2311-6706

eISSN

2150-5551

Language

en

Issue

1

Publisher

Springer Science and Business Media LLC

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