Investigation of Electromechanical Reliability and Radio Frequency Performance of a Highly Stretchable Liquid Metal Conductor for Wearable Electronics

材料科学 导线 复合材料 导电体 液态金属 热塑性聚氨酯 张力(地质) 光电子学 弹性体 极限抗拉强度
作者
Behnam Garakani,Udara S. Somarathna,Ashraf Umar,Gurvinder Singh Khinda,Mohamed Y. Abdelatty,El Mehdi Abbara,Sari Al Zerey,Michael J. Hopkins,Sai Srinivas,Chuck Kinzel,Christopher Halseth,Mark Ronay,Mark D. Poliks
出处
期刊:Journal of Electronic Packaging [ASME International]
卷期号:145 (3) 被引量:2
标识
DOI:10.1115/1.4056640
摘要

Abstract Liquid metal-based gallium conductors exhibit unique physical and electromechanical properties, which make them excellent candidates for the next generation of wearable electronics. In this study, a novel fluid phase-based gallium conductor was stencil printed on thermoplastic polyurethane (TPU) to fabricate a stretchable conductor as well as a stretchable radio frequency (RF) transmission line. The electromechanical reliability of the conductor during high elongation as well as cyclic tension and bend fatigue was evaluated and compared with commercially available stretchable silver-filled polymer paste. The microstructure of the liquid metal conductor and the silver paste was investigated via scanning electron microscopy (SEM) before and after the samples were subjected to high elongation (>100%). Unlike the silver paste, the liquid metal conductor maintained its microstructural integrity while its resistance showed a linear response to changes in length. A cyclic tension fatigue test confirmed the fatigue-free performance of the liquid metal conductor during 8000 stretching cycles at a strain amplitude of 30%. The electromagnetic structure of the RF transmission line was simulated and then compared to the measured data. The measurements for insertion loss showed that U-bending, 90 deg twisting, and 1000 stretching cycles at a strain amplitude of 100% did not have a significant impact on the RF performance. Details of the DC tests and RF measurements, including the microstructural analysis and simulation results, will be discussed in this article.

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