Lee Seungkyu, Yang Jun Chang, Park Steve
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 34141, Republic of Korea.
Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon, 51543, Republic of Korea.
Mater Horiz. 2025 Aug 26;12(17):7033-7041. doi: 10.1039/d5mh00555h.
Serpentine interconnects enable rigid materials to have high stretchability. They are considered to be very effective architectures to enable stretchable electronics. Therefore, research has primarily focused on exploring serpentine-based designs to enhance the stretchability of the interconnect itself. However, in practical applications, the interfacial cracks caused by repetitive stretching becomes a critical issue if serpentine interconnects are encapsulated within a polymer matrix. Here, we introduce geometrically engineered pores in a polymer matrix to suppress interfacial cracks under stretching. The serpentine interconnects with optimized pores in a polymer matrix improved mechanical stability (strain at failure, fatigue life) and electrical stability compared with those without pores. Furthermore, these strategies enabled the demonstration of a stretchable light-emitting diodes (LED) array and an electrical heater.
蛇形互连使刚性材料具有高拉伸性。它们被认为是实现可拉伸电子器件的非常有效的架构。因此，研究主要集中在探索基于蛇形的设计以提高互连本身的拉伸性。然而，在实际应用中，如果蛇形互连封装在聚合物基体中，由反复拉伸引起的界面裂纹就会成为一个关键问题。在此，我们在聚合物基体中引入几何设计的孔隙以抑制拉伸过程中的界面裂纹。与没有孔隙的情况相比，在聚合物基体中具有优化孔隙的蛇形互连提高了机械稳定性（失效应变、疲劳寿命）和电稳定性。此外，这些策略使得可拉伸发光二极管（LED）阵列和电加热器得以展示。
