Issue 2, 2020

An ambient-stable and stretchable ionic skin with multimodal sensation

Abstract

Skin serves as a physical and hygroscopic barrier to protect the inner body, and also contains sensory receptors to perceive environmental and mechanical stimuli. To recapitulate these salient features, hydrogel-based artificial skins have been developed. However, existing designs are constrained by limited functionality, low stability, and requirement of external power. Herein, a novel artificial ionic skin (AIskin) – an analog of the diode based on controlled ion mobility – is demonstrated with high toughness, stretchability, ambient stability and transparency. The AIskin consists of a bilayer of oppositely-charged, double-network hydrogel, and converts mechanical stimuli and humidity into signals of resistance, capacitance, open-circuit voltage (OCV), and short-circuit current (SCC), among which the OCV- and SCC-based sensing signals are self-generated. Its multimodal sensation is maintained in a wide range of relative humidities (13–85%). It is demonstrated for wearable strain-humidity sensing, human–machine interaction and walking energy harvesting. This work will open new avenues toward next-generation, skin-inspired wearable electronics.

Graphical abstract: An ambient-stable and stretchable ionic skin with multimodal sensation

Supplementary files

Article information

Article type
Communication
Submitted
09 ⵎⴰⵢ 2019
Accepted
08 ⴽⵜⵓ 2019
First published
11 ⴽⵜⵓ 2019

Mater. Horiz., 2020,7, 477-488

An ambient-stable and stretchable ionic skin with multimodal sensation

B. Ying, Q. Wu, J. Li and X. Liu, Mater. Horiz., 2020, 7, 477 DOI: 10.1039/C9MH00715F

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