LAUSR

Integrating the topology design and printing method offers a promising methodology to realize large stretchability for interconnects. Herein, eco-friendly and water-based Ag nanowires (NWs) inks were formulated and used for screen-printing highly stretchable and flexible interconnects on a large area (more than 335 mm × 175 mm). The stretchability of the interconnects was realized by introducing kirigami topology structures. The topology designed models were established to simulate the influence of kirigami patterns on wire compliance and to estimate the maximum stretchability via finite element analysis (FEA). The mechanic mechanism results demonstrate that an increase of the wave numbers results in larger stretchability, and the rectangular type of wave shows better stretchability than the zigzag and sine structures. Comparatively, the electrical and mechanical properties of the interconnects were measured and analyzed, and the experimental results were consistent with FEA. The electric conductivity of the interconnects is stable at ∼10,427 S cm−1 even after 1000 cycles of 15.83 mm radius bending, 280% stretching and 200% twisting-stretching deformation, demonstrating outstanding mechanical reliability of the interconnects. The topology designed interconnects have been applied in stretchable flexible light-emitting diode, indicating their broad application prospects in next-generation stretchable electronics.摘要结合拓扑设计和印刷方法来实现高可拉伸性互连电极的制 备有望成为一种非常有前途的策略. 本文借助丝网印刷技术, 所配 制的银纳米线水性油墨被用于制备大面积(超过335 mm × 177 mm) 的高可拉伸柔性互连电极. 电极的可拉伸性通过引入剪纸拓扑结 构来实现, 并通过有限元法分析了所设计的系列剪纸拓扑模型对 变形顺应性的影响, 以此探究其最优拉伸性. 系统的力学机理分析 表明结构的可拉伸性随着波数的增加而增加, 与锯齿形波和正弦 形波剪纸结构相比, 矩形波结构具有最佳可拉伸性. 此外, 电极的 电学性能测试结果与有限元分析预测的结果相一致. 该方法制备 的互连电极具有 ∼10427 S cm−1 的高电导率, 并且表现出优异的力 学稳定性, 经过 1000次的弯曲循环(弯曲半径为 15.83 mm)、拉伸 循环(拉伸率为280%)和扭转-拉伸循环(扭转 180°, 拉伸率为 200%) 测试, 电导率始终保持稳定. 基于拓扑设计的互连电极被应用于可 拉伸柔性LED电路, 进一步证明其在下一代可拉伸电子产品中具有 广泛的应用前景.