题目：

Freestanding Serpentine Silicon Strips with Ultrahigh Stretchability over 300% for Wearable Electronics

作者：

Yihao Shi^1#, Jianzhong Zhao^2,3#, Bingchang Zhang⁴*, Jiahao Qin^1,5,6, Xinyue Hu¹, Yuan Cheng^5,6, Jia Yu¹, Jiansheng Jie¹* and Xiaohong Zhang^1,7*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, Jiangsu, China

²Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, P.R. China

³Laboratory of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, Jiangsu, China

Laboratory of Flexible Electronics Technology, Tsinghua University, Beijing 100084, P.R. China

⁴School of Optoelectronic Science and Engineering, Key Laboratory of Advanced Optical Manufacturing, Technologies of Jiangsu Province, Key Laboratory of Modern Optical Technologies of Education, Ministry of China, Soochow University, Suzhou 215006, P. R. China

⁵Suzhou Industrial Park Monash Research Institute of Science and Technology, Monash University, Suzhou 215000, China

⁶Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia

⁷Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Suzhou, 215123, Jiangsu, China

摘要：

Well-functionalized electronic materials, such as silicon, in a stretchable format are desirable for high-performance wearable electronics. However, obtaining Si materials that meet the required stretchability of over 100% for wearable applications remains a significant challenge. Herein, a rational design strategy is proposed to achieve freestanding serpentine Si strips (FS-Si strips) with ultrahigh stretchability, fulfilling wearable requirements. The self-supporting feature makes the strips get rid of excessive constraints from substrates and enables them to deform with the minimum strain energy. Micrometer-scale thicknesses enhance robustness, and large diameter-to-width ratios effectively reduce strain concentration. Consequently, the FS-Si strips with the optimum design could withstand 300% stretch, bending, and torsion without fracturing, even under rough manual operation. They also exhibit excellent stability and durability over 50,000 cycles of 100% stretching cycles. For wearable applications, the FS-Si strips can maintain conformal contact with the skin and have a maximum stretchability of 120%. Moreover, they are electrically insensitive to large deformations, which ensure signal stability during their daily use. Combined with mature processing techniques and the excellent semiconductor properties of Si, FS-Si strips are promising core stretchable electronic materials for wearable electronics.

影响因子：

32.086

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/adma.202313603