Gul Osman, Song Myoung, Gu Chang-Yeon, Ahn Jihyeon, Lee Kichul, Kim Taek-Soo, Ahn Junseong, Kim Hye Jin, Park Inkyu
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Daejeon, Yuseong-gu, 34141, Republic of Korea.
Intelligent Components and Sensors Research Section, Electronics and Telecommunication Research Institute (ETRI), 218 Gajeong-ro, Daejeon, Yuseong-gu, 34129, Republic of Korea.
Small. 2025 Jan 31:e2410247. doi: 10.1002/smll.202410247.
With the advancement of electronics, there is a growing need to effectively combine rigid, flexible, and stretchable materials to build hybrid electronics. However, the interfacial transition between rigid/flexible and stretchable substrates presents considerable challenges, mainly due to differences in elastic moduli, complicating their integration for practical usage. Here, bioinspired omnidirectional interfacial-engineered flexible islands (BOIEFI) are introduced for a robust transition from flexible to stretchable substrates. These BOIEFIs enable the creation of highly stretchable and durable hybrid substrates capable of withstanding diverse physical deformations such as stretching, twisting, and even poking. Inspired by plant roots, BOIEFIs are designed with primary and secondary root structures that provide flexible mechanical interlocking between substrates with different elastic moduli. Through experimental and computational methods, optimized BOIEFIs exhibit significantly enhanced stretchability and improved fatigue life. To demonstrate the broad applicability, light-emitting diodes (LEDs) are integrated into BOIEFIs to establish a stretchable display. In addition, a human-machine interface device with soft pressure sensors and an LED array is fabricated for the implementation of hybrid electronics. This approach facilitates the harmonious integration of rigid, flexible, and stretchable substrates, leading to the creation of soft, highly stretchable, and durable hybrid electronics.
随着电子技术的进步，有效结合刚性、柔性和可拉伸材料以构建混合电子产品的需求日益增长。然而，刚性/柔性与可拉伸基板之间的界面过渡带来了相当大的挑战，主要是由于弹性模量的差异，这使得它们在实际应用中的集成变得复杂。在此，引入了受生物启发的全向界面工程柔性岛（BOIEFI），以实现从柔性基板到可拉伸基板的稳健过渡。这些BOIEFI能够创建高度可拉伸且耐用的混合基板，能够承受各种物理变形，如拉伸、扭曲甚至戳刺。受植物根系启发，BOIEFI设计有主根和次根结构，可在具有不同弹性模量的基板之间提供灵活的机械互锁。通过实验和计算方法，优化后的BOIEFI表现出显著增强的拉伸性和改善的疲劳寿命。为了证明其广泛的适用性，将发光二极管（LED）集成到BOIEFI中以建立可拉伸显示器。此外，还制造了一种带有软压力传感器和LED阵列的人机接口设备，以实现混合电子产品。这种方法有助于刚性、柔性和可拉伸基板的和谐集成，从而创造出柔软、高度可拉伸且耐用的混合电子产品。
