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

• DOI: 10.1021/acssensors.3c01835
• Publication Date: 2024-02-01T17:59:40Z
• Authors: Seokkyoon Hong; Taewoong Park; Junsang Lee; Yuhyun Ji; Julia Walsh; Tianhao Yu; Jae Young Park; Jongcheon Lim; Claudia Benito Al...; Luis Solorio; Hyowon Lee; Young L. Kim; Dong Rip Kim; Chi Hwan Lee
• Keywords: Hysteresis; Electrical current

Self-healing hydrogels are in high demand for wearable sensing applications due to their remarkable deformability, ionic and electrical conductivity, self-adhesiveness human skin, as well resilience both mechanical damage. However, these face challenges such delayed healing times unavoidable hysteresis, which limit practical effectiveness. Here, we introduce a self-healing hydrogel that exhibits exceptionally rapid with recovery time of less than 0.12 s an ultralow hysteresis 0.64% under cyclic strains up 500%. This strikes ideal balance, without notable trade-offs, between properties softness, self-adhesiveness, response times, durability, overshoot behavior, resistance nonaxial deformations twisting, bending, pressing. Owing this unique combination features, the is highly suitable long-term, durable use applications, including monitoring body movements electrophysiological activities on skin.