Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 1, Pages 2029-2037Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c21325
Keywords
I-Skin; stretchable ionogels; self-healing; adhesive; photoluminescent; 3D printing; flexible sensor; human-machine interface
Funding
- National Science Foundation of China [22075066]
- Natural Science Foundation of Hebei Province [B2020201037]
- Open Research Fund of CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences
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This article introduces an ultrastretchable, ultrastrong adhesive, ultrafast self-healable, and high thermally stable ionogel with shape memory properties. The ionogel demonstrates excellent performance in sensors and human-machine interfaces, and can work effectively over a wide temperature range.
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 self-healable (10 s), high thermally stable (-60 to 250 degrees 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 degrees 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.
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