• 文献标题:   Scorpion-inspired dual-bionic, microcrack-assisted wrinkle based laser induced graphene-silver strain sensor with high sensitivity and broad working range for wireless health monitoring system
  • 文献类型:   Article
  • 作  者:   WANG WT, LU LS, LU XY, LIANG ZB, LIN HH, LI ZH, WU XH, LIN LH, XIE YX
  • 作者关键词:   laserinduced graphene, strain sensor, scorpion, dualbionic, microcrackassisted wrinkle, health monitoring system
  • 出版物名称:   NANO RESEARCH
  • ISSN:   1998-0124 EI 1998-0000
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1007/s12274-022-4680-0 EA AUG 2022
  • 出版年:   2023

▎ 摘  要

Scorpions, through ruthless survival of the fittest, evolve the unique ability to quickly locate and hunt prey with slit receptors near the leg joints and a sharp sting on the multi freedom tail. Inspired by this fantastic creature, we herein report a dual-bionic strategy to fabricate microcrack-assisted wrinkle strain sensor with both high sensitivity and stretchability. Specifically, laser-induced graphene (LIG) is transferred from polyimide film to Ecoflex and then coated with silver paste using the casting-and-peeling and prestretch-and-release methods. The shape-adaptive and long-range ordered geometry (e.g., amplitude and wavelength) of dual-bionic structure is prestrain-tuned to optimize the superfast response time (similar to 76 ms), high sensitivity (gauge factor = 223.6), broad working range (70%-100%), and good reliability (> 800 cycles) of scorpion-inspired strain sensor, outperforming many LIG-based materials and other bionic sensors. The alternate reconnect/disconnect behaviors of slit-organ-like microcracks in the mechanical weak areas initiate tremendous resistance changes, whereas the scorpion-tail-like wrinkles act as a "bridge" connecting the adjacent LIG resistor units, enabling reversible resilience and unimpeded electrical linkages over a wide strain range. Combined with the self-developed miniaturized, flexible, and all-in-one wireless transmission system, a variety of scenarios such as large body movements, tiny pulse, and heartbeat are real-time monitored via bluetooth and displayed in the client-sides, revealing a huge promise in future wearable electronics.