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. 2021 Sep;33(37):e2102684.
doi: 10.1002/adma.202102684. Epub 2021 Aug 2.

An Anti-Fatigue Design Strategy for 3D Ribbon-Shaped Flexible Electronics

Xu Cheng  1   2 , Fan Zhang  1   2 , Renheng Bo  1   2 , Zhangming Shen  1   2 , Wenbo Pang  1   2 , Tianqi Jin  1   2 , Honglie Song  1   2 , Zhaoguo Xue  1   2 , Yihui Zhang  1   2
Affiliations

An Anti-Fatigue Design Strategy for 3D Ribbon-Shaped Flexible Electronics

Xu Cheng et al. Adv Mater. 2021 Sep.

Abstract

Three-dimensional (3D) flexible electronics represent an emerging area of intensive attention in recent years, owing to their broad-ranging applications in wearable electronics, flexible robots, tissue/cell scaffolds, among others. The widely adopted 3D conductive mesostructures in the functional device systems would inevitably undergo repetitive out-of-plane compressions during practical operations, and thus, anti-fatigue design strategies are of great significance to improve the reliability of 3D flexible electronics. Previous studies mainly focused on the fatigue failure behavior of planar ribbon-shaped geometries, while anti-fatigue design strategies and predictive failure criteria addressing 3D ribbon-shaped mesostructures are still lacking. This work demonstrates an anti-fatigue strategy to significantly prolong the fatigue life of 3D ribbon-shaped flexible electronics by switching the metal-dominated failure to desired polymer-dominated failure. Combined in situ measurements and computational studies allow the establishment of a failure criterion capable of accurately predicting fatigue lives under out-of-plane compressions, thereby providing useful guidelines for the design of anti-fatigue mesostructures with diverse 3D geometries. Two mechanically reliable 3D devices, including a resistance-type vibration sensor and a janus sensor capable of decoupled temperature measurements, serve as two demonstrative examples to highlight potential applications in long-term health monitoring and human-like robotic perception, respectively.

Keywords: 3D ribbon-shaped mesostructures; anti-fatigue strategy; fatigue life prediction; flexible electronics; mechanically-guided assembly.

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