Journal
SCIENCE CHINA-MATERIALS
Volume 64, Issue 4, Pages 942-952Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-020-1507-0
Keywords
hydrogel; ionic cross-linking; strain sensor; E-skin
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Funding
- National Natural Science Foundation of China [21872119, 22072127]
- Talent Engineering Training Funding Project of Hebei Province [A201905004]
- Research Program of the College Science and Technology of Hebei Province [ZD2018091]
- Hebei Province Graduate Innovation Funding Project [CXZZSS2020047]
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The study presents a novel multifunctional ion-crosslinked hydrogel with high sensitivity and excellent mechanical properties, which can be used for wearable strain sensors and monitoring human motion.
Flexible sensors that can respond to multiple mechanical excitation modes and have high sensitivity are of great significance in the fields of electronic skin and health monitoring. Simulating multiple signal responses to skin such as strain and temperature remains an important challenge. Therefore, new multifunctional ion-crosslinked hydrogels with toughness and conductivity were designed and prepared in this work. A chemical gel with high mechanical strength was prepared by cross-linking acrylamide with N,N '-methylene-bisacrylamide and ammonium persulfate. In addition, in order to enhance the conductive properties of the hydrogel, Ca2+, Mg2+ and Al3+ ions were added to the hydrogel during cross-linking. The double-layer network makes this ionic hydrogel show excellent mechanical properties. Moreover, the composite hydrogel containing Ca2+ can reach a maximum stretch of 1100% and exhibits ultra-high sensitivity (S-p = 10.690 MPa-1). The obtained hydrogels can successfully prepare wearable strain sensors, as well as track and monitor human motion. The present prepared multifunctional hydrogels are expected to be further expanded to intelligent health sensor materials.
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