Robust and reliable piezo-ionic materials that are both crack resistant and selfhealable like biological skin hold great promise for applications inflexible electronics and intelligent systems with prolonged service l...Robust and reliable piezo-ionic materials that are both crack resistant and selfhealable like biological skin hold great promise for applications inflexible electronics and intelligent systems with prolonged service lives.However,such a combination of high toughness,superior crack resistance,autonomous self-healing and effective control of ion dynamics is rarely seen in artificial iontronic skin because these features are seemingly incompatible in materials design.Here,we resolve this perennial mismatch through a molecularly engineered strategy of implanting carboxyl-functionalized groups into the dynamic hard domain structure of synthesized poly(urethane-urea).This design provides an ultra-high fracture energy of 211.27 kJ m^(-2)that is over 123.54 times that of tough human skin,while maintaining skin-like stretchability,elasticity,and autonomous self-healing with a 96.40%healing efficiency.Moreover,the carboxyl anion group allows the dynamic confinement of ionic fluids though electrostatic interaction,thereby ensuring a remarkable pressure sensitivity of 7.03 kPa^(-1)for the tactile sensors.As such,we successfully demonstrated the enormous potential ability of this skin-like piezoionic sensor for biomedical monitoring and robotic item identification,which indicates promising future uses in flexible electronics and human-machine interactions.展开更多
基金National Key Research and Development Program of China(Grant No.2022YFB3808800)the National Nature Science Foundation of China(Grant No.52272084,Grant No.52202101,Grant No.52203002,Grant No.52072177)+2 种基金the National Science Foundation of Jiangsu Province(Grant No.BK20220430)the Natural Science Foundation of Jiangsu Higher Education Institutions of China(Grant No.22KJB430007)the Fundamental Research Funds for the Central Universities(Grant No.2023102003,Grant No.30924010202).
文摘Robust and reliable piezo-ionic materials that are both crack resistant and selfhealable like biological skin hold great promise for applications inflexible electronics and intelligent systems with prolonged service lives.However,such a combination of high toughness,superior crack resistance,autonomous self-healing and effective control of ion dynamics is rarely seen in artificial iontronic skin because these features are seemingly incompatible in materials design.Here,we resolve this perennial mismatch through a molecularly engineered strategy of implanting carboxyl-functionalized groups into the dynamic hard domain structure of synthesized poly(urethane-urea).This design provides an ultra-high fracture energy of 211.27 kJ m^(-2)that is over 123.54 times that of tough human skin,while maintaining skin-like stretchability,elasticity,and autonomous self-healing with a 96.40%healing efficiency.Moreover,the carboxyl anion group allows the dynamic confinement of ionic fluids though electrostatic interaction,thereby ensuring a remarkable pressure sensitivity of 7.03 kPa^(-1)for the tactile sensors.As such,we successfully demonstrated the enormous potential ability of this skin-like piezoionic sensor for biomedical monitoring and robotic item identification,which indicates promising future uses in flexible electronics and human-machine interactions.
