writer：Gehong Su, Shuya Yin, Youhong Guo, Fei Zhao, Quanquan Guo, Xinxing Zhang, and Tao Zhou,* and Guihua* Yu
keywords：Self-healing, conductive, hydrogel, sensor, human-machine-interfaces
source：期刊
specific source：Materials Horizons, 2021, 8, 1795-1804
Issue time：2021年

Conductive self-healing hydrogels (CSHs) that

match the mechanical properties of biological tissues are highly desired for

emerging wearable electronics. However, It is still a fundamental challenge to

balance the trade-offs among the mechanical, electronic, and self-healing

properties in CSHs. Herein, we presented supramolecular double-network (DN)

CSHs by pre-infiltrating conductive polyaniline (PANI) precursor into the

self-healable hydrophobic association poly(acrylic acid) (HAPAA) hydrogel

matrix. The dynamic interfacial interactions between HAPAA and PANI networks efficiently

enhanced the mechanical performances of the HAPAA/PANI (PAAN) hydrogel and can

compensate for the negative effect of the enhanced mechanical strength on

self-healing. In addition, the interconnected PANI network endowed the PAAN

hydrogel with high conductivity and excellent sensory performances. As such,

the mechanical and electronic properties of PAAN hydrogel were simultaneously enhanced

significantly without compromising the self-healing performance of the HAPAA matrix,

achieving balanced mechanical, electronic, and self-healing properties in PAAN

hydrogel. Last, proof-of-concept applications like human

physiological monitoring electronics, flexible touch screen, and artificial electronic skin are

successfully demonstrated using PAAN hydrogel with the capability of restoring

their electronic performances after the healing process. It is anticipated that

such hydrogel network design can be extended into next-generation hydrogel

electronics for human-machine-interfaces and soft robotics.