Ultrafast, autonomous self-healable iontronic skin exhibiting piezo-ionic dynamics

Elvis K. Boahen, Baohai Pan, Hyukmin Kweon, Joo Sung Kim, Hanbin Choi, Zhengyang Kong, Dong Jun Kim, Jin Zhu, Wu Bin Ying (), Kyung Jin Lee () and Do Hwan Kim ()
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Elvis K. Boahen: Hanyang University
Baohai Pan: Chungnam National University
Hyukmin Kweon: Hanyang University
Joo Sung Kim: Hanyang University
Hanbin Choi: Hanyang University
Zhengyang Kong: Hanyang University
Dong Jun Kim: Hanyang University
Jin Zhu: Chinese Academy of Sciences
Wu Bin Ying: Hanyang University
Kyung Jin Lee: Chungnam National University
Do Hwan Kim: Hanyang University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The self-healing properties and ionic sensing capabilities of the human skin offer inspiring groundwork for the designs of stretchable iontronic skins. However, from electronic to ionic mechanosensitive skins, simultaneously achieving autonomously superior self-healing properties, superior elasticity, and effective control of ion dynamics in a homogeneous system is rarely feasible. Here, we report a Cl-functionalized iontronic pressure sensitive material (CLiPS), designed via the introduction of Cl-functionalized groups into a polyurethane matrix, which realizes an ultrafast, autonomous self-healing speed (4.3 µm/min), high self-healing efficiency (91% within 60 min), and mechanosensitive piezo-ionic dynamics. This strategy promotes both an excellent elastic recovery (100%) and effective control of ion dynamics because the Cl groups trap the ions in the system via ion-dipole interactions, resulting in excellent pressure sensitivity (7.36 kPa−1) for tactile sensors. The skin-like sensor responds to pressure variations, demonstrating its potential for touch modulation in future wearable electronics and human–machine interfaces.

Date: 2022
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DOI: 10.1038/s41467-022-35434-8

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