Highly stretchable and self-healable ionogels with multiple sensitivity towards compression, strain and moisture for skin-inspired ionic sensors

Ionic skin (I-skin) is an emerging skin-inspired sensor that has received increasing interest for the next-generation wearable electronics. However, profound challenges I-skin remain in achieving multiple signal responses (e.g., strain, pressure, and humidity) self-healability to fully mimic human skin. Herein, a Fe3+ ion-coordinated poly(acrylic acid) ionogel (PAIFe) with high stretchability, extreme temperature tolerance, self-healing capability prepared by dynamic ionic cross-linking strategy. The coordination PAIFe contributes formation of highly network, its high-efficient reliable performance even at low ?20°C. Using 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]) as solvent achieves wide-temperature tolerance under temperatures. More interestingly, humidity sensing function realized skillfully utilizing hygroscopic properties [BMIm][BF4]. resultant proof-of-concept demonstrated deformation-tolerant conductor sensor, showing variety sensory capabilities towards compression, strain humidity.