Mechanically Robust, Antifatigue, and Temperature-Tolerant Nanocomposite Ionogels Enabled by Hydrogen Bonding as Wearable Sensors
ACS APPLIED POLYMER MATERIALS(2022)
摘要
Flexible wearable sensors originating from ionogels have found extensive and significant applications in electronic skins, body-health monitoring, and personal healthcare diagnosis. Developing an ionogel-based sensor with robust mechanics and durable sensing in a wide service temperature range remains challenging. Herein, a high-performance wearable sensor with temperature-tolerant mechanics and durable sensing was constructed by virtue of hydrogen bonding between a poly(vinyl alcohol) (PVA)-incorporated nanocomposite interpenetrating network and an ionic liquid, i.e., 1-butyl-3-methylimidazolium iodide ([C4mim][I]). Through modulation of hydrogen bonding and thus good compatibility between [C4mim][I] and the network, the ionogels exhibited superior mechanics, excellent antifatigue, and durable sensing in a wide working temperature range. The ionogel-based wearable sensor exhibited stable and repeatable sensitivity toward various human motions including finger bending, elbow joint bending, and swallowing. More importantly, the pressure sensing can be completely preserved in a service temperature range of -20 to 80 degrees C. This work provided a feasible method to construct a mechanically strong, temperature-durable ionogel-based multimode sensor, which would find versatile applications as electronic skins, human-motion detection, and intelligent devices.
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关键词
nanocomposite,ionogels,temperature-tolerant,wearable sensing,hydrogen bonding
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