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Vol. 15 (2023)

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

https://doi.org/10.1007/s40820-023-01149-8
Jiemin Wang
College of Biomedical Engineering, Sichuan University, Chengdu 610064, People’s Republic of China
Tairan Yang
Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Locked Bag 20000, Geelong, Victoria 3220, Australia
Zequn Wang
College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, People’s Republic of China
Xuhui Sun
College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, People’s Republic of China
Meng An
College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, People’s Republic of China
Dan Liu
Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Locked Bag 20000, Geelong, Victoria 3220, Australia
Changsheng Zhao
State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Gang Zhang
Institute of High Performance Computing A*STAR , Singapore 138632, Singapore
Weiwei Lei
Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Locked Bag 20000, Geelong, Victoria 3220, Australia

Corresponding Author: Weiwei Lei

weiwei.lei@deakin.edu.au

Nano-Micro Letters, Vol. 15 (2023), Article Number: 170

Abstract

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−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.


Highlights:


1 Construction of a viscoelastic composite nacre with a ripple-like layered architecture through supramolecular interactions.
2 Outstanding self-adhesion, self-healing and scrape-resistant mechanical and thermal properties.
3 Utility as an integrated heat spreader and TIMs for “chameleon-like” thermal management of planar soft electronics.

Keywords

Boron nitride nanosheets Nacre-inspired composites Viscoelastic Thermochromic Smart thermal management
Wang, Jiemin, Tairan Yang, Zequn Wang, Xuhui Sun, Meng An, Dan Liu, Changsheng Zhao, Gang Zhang, and Weiwei Lei. 2023. “A Thermochromic, Viscoelastic Nacre-Like Nanocomposite for the Smart Thermal Management of Planar Electronics”. Nano-Micro Letters 15 (July):170. https://doi.org/10.1007/s40820-023-01149-8.
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