Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 11, Pages 5949-5956Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta00641a
Keywords
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Funding
- NNSF of China [21704043]
- Natural Science Foundation of Jiangsu Province [BK20170990, 17KJB150020]
- Six Talent Peak Innovation Team in Jiangsu Province [TD-SWYY-009]
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A highly sensitive sensor platform is significant for human-machine interactions and healthcare applications due to its instantaneous monitoring of human physiological activities. However, current flexible sensors are confronted with liability to rupture, malfunction under subzero temperatures and deficient recyclability, posing great challenges to long-term implementation. Herein, a highly stretchable and healable somatosensory platform with excellent low temperature tolerance was demonstrated by adopting self-healing hydrogels as building blocks. Both metal-coordinated bonds and tetrahedral borate interactions within the binary-networked frameworks account for the satisfactory stretchability (similar to 550%), remarkable healed strain (similar to 497% after 6 h) and high healing efficiency (similar to 90.4%). Self-remolding capacity to regain the mechanical performance is also presented, showing superb malleability. Low temperature (-25 degrees C) tolerance of the sensor is favorable for all-weather applications. In addition, the piezoresistive sensor has negligible electrical hysteresis, fast response (similar to 31 ms) and electrically self-healable behavior. Various human motions (e.g., finger bending, phonation, and limb activity) can be differentiated by this hydrogel-based sensor.
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