Jung Yeongju, Pyun Kyung Rok, Yu Sejong, Ahn Jiyong, Kim Jinsol, Park Jung Jae, Lee Min Jae, Lee Byunghong, Won Daeyeon, Bang Junhyuk, Ko Seung Hwan
Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea.
Energy Device Research Team, Hyundai Motor Company, 37 Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16082, South Korea.
Nanomicro Lett. 2025 Jan 31;17(1):127. doi: 10.1007/s40820-024-01627-7.
Metallic nanowires have served as novel materials for soft electronics due to their outstanding mechanical compliance and electrical properties. However, weak adhesion and low mechanical robustness of nanowire networks to substrates significantly undermine their reliability, necessitating the use of an insulating protective layer, which greatly limits their utility. Herein, we present a versatile and generalized laser-based process that simultaneously achieves strong adhesion and mechanical robustness of nanowire networks on diverse substrates without the need for a protective layer. In this method, the laser-induced photothermal energy at the interface between the nanowire network and the substrate facilitates the interpenetration of the nanowire network and the polymer matrix, resulting in mechanical interlocking through percolation. This mechanism is broadly applicable across different metallic nanowires and thermoplastic substrates, significantly enhancing its universality in diverse applications. Thereby, we demonstrated the mechanical robustness of nanowires in reusable wearable physiological sensors on the skin without compromising the performance of the sensor. Furthermore, enhanced robustness and electrical conductivity by the laser-induced interlocking enables a stable functionalization of conducting polymers in a wet environment, broadening its application into various electrochemical devices.
金属纳米线因其出色的机械柔顺性和电学性能，已成为用于柔性电子器件的新型材料。然而，纳米线网络与基底之间的弱粘附力和低机械强度显著削弱了它们的可靠性，因此需要使用绝缘保护层，这极大地限制了它们的实用性。在此，我们提出了一种通用且基于激光的工艺，该工艺能在无需保护层的情况下，同时实现纳米线网络在各种基底上的强粘附力和机械强度。在这种方法中，纳米线网络与基底界面处的激光诱导光热能促进纳米线网络与聚合物基体的互穿，通过渗滤作用形成机械互锁。这种机制广泛适用于不同的金属纳米线和热塑性基底，显著提高了其在各种应用中的通用性。由此，我们展示了纳米线在可重复使用的皮肤可穿戴生理传感器中的机械强度，同时不影响传感器的性能。此外，激光诱导互锁增强的强度和导电性使导电聚合物在潮湿环境中能够实现稳定的功能化，从而将其应用拓展到各种电化学器件中。
