A facile strategy for fabricating self-healable, adhesive and highly sensitive flexible ionogel-based sensors
JOURNAL OF MATERIALS CHEMISTRY C(2022)
摘要
Stretchable ionogels have been intensively investigated for the development of flexible and wearable sensors. Integration of excellent mechanical properties, high conductivity, reliable adhesiveness, remarkable self-healing ability, favorable transparency and biocompatibility is highly desired for ionogel-based flexible sensors but is still challenging. Herein, a high-performance flexible sensor based on a well-designed ionogel with excellent comprehensive properties was facilely fabricated via introducing oppositely charged poly(acrylic acid) (PAA) and polyethyleneimine (PEI) into a green deep eutectic solvent (DES) composed of biocompatible choline chloride and urea. Dynamic physically cross-linked networks were efficiently constructed through noncovalent interactions, including PAA/PEI electrostatic interactions and hydrogen bonding interactions between PAA/PEI and DES. The as-prepared PAA/PEI/DES ionogels exhibit well-tailored mechanical properties, high conductivity, desirable transparency, strong adhesiveness and highly efficient self-healing ability simultaneously. More importantly, the assembled ionogel-based sensor possesses excellent sensory capabilities towards strain and temperature, including high sensitivity (gauge factor up to 6), wide sensing range (1-600% strain), short response time and outstanding durability. The fractured sensor could be easily healed at 40 degrees C and their initial sensing performance can be fully restored. This study offers a promising strategy for fabricating biocompatible, flexible and highly sensitive ionogel-based wearable sensors for a full-range of human motion detection.
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