American Chemical Society
se3c01835_si_001.pdf (1.85 MB)

Rapid Self-Healing Hydrogel with Ultralow Electrical Hysteresis for Wearable Sensing

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journal contribution
posted on 2024-02-01, 17:50 authored by Seokkyoon Hong, Taewoong Park, Junsang Lee, Yuhyun Ji, Julia Walsh, Tianhao Yu, Jae Young Park, Jongcheon Lim, Claudia Benito Alston, Luis Solorio, Hyowon Lee, Young L. Kim, Dong Rip Kim, Chi Hwan Lee
Self-healing hydrogels are in high demand for wearable sensing applications due to their remarkable deformability, high ionic and electrical conductivity, self-adhesiveness to human skin, as well as resilience to both mechanical and electrical damage. However, these hydrogels face challenges such as delayed healing times and unavoidable electrical hysteresis, which limit their practical effectiveness. Here, we introduce a self-healing hydrogel that exhibits exceptionally rapid healing with a recovery time of less than 0.12 s and an ultralow electrical hysteresis of less than 0.64% under cyclic strains of up to 500%. This hydrogel strikes an ideal balance, without notable trade-offs, between properties such as softness, deformability, ionic and electrical conductivity, self-adhesiveness, response and recovery times, durability, overshoot behavior, and resistance to nonaxial deformations such as twisting, bending, and pressing. Owing to this unique combination of features, the hydrogel is highly suitable for long-term, durable use in wearable sensing applications, including monitoring body movements and electrophysiological activities on the skin.