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Ionically Conductive Hydrogel with Fast Self‐Recovery and Low Residual Strain as Strain and Pressure Sensors
Author(s) -
Sun Xia,
Yao Fanglian,
Wang Chenying,
Qin Zhihui,
Zhang Haitao,
Yu Qingyu,
Zhang Hong,
Dong Xiaoru,
Wei Yuping,
Li Junjie
Publication year - 2020
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000185
Subject(s) - self healing hydrogels , materials science , electrical conductor , gelatin , ultimate tensile strength , composite material , ionic bonding , polyacrylamide , electrolyte , flexible electronics , nanotechnology , electrode , polymer chemistry , ion , chemistry , biochemistry , organic chemistry
Hydrogel‐based sensors have attracted enormous interest due to their broad applications in wearable devices. However, existing hydrogel‐based sensors cannot integrate satisfying mechanical performances with excellent conductivity to meet the requirements for practical application. Herein, an ionically conductive hydrogel with high strength, fast self‐recovery, and low residual strain is constructed through a facile soaking strategy. The proposed ionically conductive double network hydrogel is achieved by combining chemically crosslinked polyacrylamide and physically crosslinked gelatin network followed by sodium citrate solution immersing. The obtained hydrogel has a tensile strength of 1.66 MPa and an elongation of 849%. The ionically conductive hydrogels can be utilized as both strain and pressure sensors with high sensitivity. Moreover, they can be used as ionic skin to monitor various human movements precisely, demonstrating their promising potential in wearable devices and flexible electronics.