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As a kind of typical soft and wet material, hydrogel has been increasing investigated as another way to develop flexible electronics. However, the traditional hydrogel with poor strain and strength cannot meet the requirement as stretchable electronics, fabricating stretchable hydrogel with balanced tensile strength, toughness and conductivity is still a big challenge. Herein, a new type of physically cross-linked hydrogel with poly(acrylamide-co-acrylic acid)-Fe3+ and chitosan-SO42- dual ionic networks via facile free radical polymerization and soaking processes is developed to fabricate excellent high-performance flexible sensors. The abundant Fe3+ and SO42- ions in the hydrogel can not only construct tough and strong dual ionic networks but also give hydrogel high conductivity. Consequently, the optimal hydrogel possesses high tensile strength (∼5.1 MPa), large strain (~1225%), elasticity (∼1.13 MPa), high toughness (∼32.1 MJ/m3), high conductivity (3.04 S/m at f = 0.1M), as well as rapid self-recovery property. Furthermore, the hydrogel conductor has high stretching sensitivity with a gauge factor of 6.0 at strain of 700% and demonstrates to be able to detect the conventional motion signal of the human body such as the motion of knuckle, speaking and swallowing, which indicates our ionic conductive hydrogels can be used to fabricate excellent high-performance flexible sensors.
This article was published in the following journal.
Name: ACS applied materials & interfaces
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