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Tough but self-healing and 3D printable hydrogels for E-skin, E-noses and laser controlled actuators

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Abstract

A versatile hydrogel with extraordinary mechanical strength and self-healing efficiency was developed by integrating physically crosslinked graphene oxide (GO) into a chemically crosslinked polyacrylic acid (PAA) network. The PAA–GO–Ca2+ hydrogel with dual-crosslinked networks exhibited remarkable mechanical properties, such as an outstanding stretchability to 2500% and high toughness (∼9.73 MJ m−3) along with high stiffness (Young's modulus:∼753.667 kPa). The hydrogel also showed a remarkable self-healing capability to maintain ∼87.47%, 88.02% and 86.93% of its tensile strength, tensile strain, and toughness, respectively, which was attributed to the reversible hydrogen bonding and ionic interactions of Ca2+ with PAA and GO. Reduction was further performed on 3D printed PAA–GO–Ca2+ hydrogels to reduce GO and produce conductive PAA–rGO–Ca2+ hydrogels as wearable biosensors for monitoring different human activities, ammonia detection and laser-driven actuators.

Graphical abstract: Tough but self-healing and 3D printable hydrogels for E-skin, E-noses and laser controlled actuators

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Publication details

The article was received on 24 Apr 2019, accepted on 01 Aug 2019 and first published on 01 Aug 2019


Article type: Paper
DOI: 10.1039/C9TA04248B
J. Mater. Chem. A, 2019, Advance Article

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    Tough but self-healing and 3D printable hydrogels for E-skin, E-noses and laser controlled actuators

    Y. Wang, Q. Chang, R. Zhan, K. Xu, Y. Wang, X. Zhang, B. Li, G. Luo, M. Xing and W. Zhong, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA04248B

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