writer：Shuai Hao, Tianci Li, Xuemeng Yang, Hongzan Song
keywords：I-Skin, stretchable ionogels, self-healing, adhesive, photoluminescent, 3D printing, flexible sensor, human?machine interface
source：期刊
specific source：ACS Appl. Mater. Interfaces
Issue time：2022年

Developing multifunctional stretchable ionic skin (I-Skin) to mimic

the sensations of the human skin is of great interest and shows promising potential

in wearable sensors and human?machine interfaces (HMIs). However, common

ionogels prepared with small-molecule cross-linkers and single networks can hardly

satisfy the requirements of adjustable mechanical properties, strong adhesion, fast

self-healability, and good stability in extreme environments. Herein, an

ultrastretchable (>10,000%), ultrastrong adhesive (>6.8 MPa), ultrafast selfhealable

(10 s), high thermally stable (?60 to 250 °C), and three-dimensional

(3D)-printable photoluminescent ionogel with shape memory properties has been

designed. The ionogel consists of hyperbranched polymer covalent-cross-linked

poly(zwitterionic ionic liquid)-co-poly(acrylic acid) and multiple dynamic bonding cross-linked networks. The excellent

performance of the ionogel-based high-stretchable strain sensor and the triboelectric nanogenerator (TENG)-based self-powered

touch sensor is further demonstrated over a wide temperature range (?40 to 150 °C). More importantly, ionogel-based I-Skin can

work as an HMI for human gesture recognition and real-time wireless control of robots under extreme vacuum conditions and can

also self-heal immediately along with function recovery after mechanical damage