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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

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Abstract

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 (∼ 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.

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Acknowledgements

The current study was supported by the Natural Science Foundation of Guangdong Province, China (No. 2021B1515020087) and the National Natural Science Foundation of China (No. 51905178).

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  1. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, 510641, China

    Wentao Wang, Longsheng Lu, Xiaoyu Lu, Zhanbo Liang, Honghao Lin, Zehong Li, Xiaohua Wu, Lihui Lin & Yingxi Xie

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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

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Wang, W., Lu, L., Lu, X. et al. 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. Nano Res. 16, 1228–1241 (2023). https://doi.org/10.1007/s12274-022-4680-0

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