Journal
ADVANCED ELECTRONIC MATERIALS
Volume 5, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/aelm.201900285
Keywords
capacitive strain sensors; electronic skin; human motion detection; MXene; PVA hydrogels; self healing
Funding
- National Key Research and Development Program of China [2018YFB1105400]
- National Natural Science Foundation of China [51705154, 61804054]
- Shanghai Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Shanghai Rising-Star Program (A type) [18QA1401300]
- Shanghai Sailing Program [17YF1403300]
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Capacitive strain sensors could become an important component of electronic skin (E-skin) due to their low hysteresis and high linearity. However, to fully mimic the functionality of human skin, a capacitive strain sensor should be stretchable and self-healable. The development of such a sensor is limited by electrode materials which generally lack self-healability and/or stretchability. A highly stretchable and self-healing MXene (Ti3C2Tx)/polyvinyl alcohol (PVA) hydrogel electrode is developed for use in capacitive strain sensors for E-skin. The incorporation of MXene into the PVA enhances the conductivity and self-healability of the hydrogel. The electrode exhibits high stretchability at break (approximate to 1200%) and instantaneous self healing (healing time approximate to 0.15 s). A capacitive sensor based on these electrodes shows high linearity, up to 200%, low hysteresis, a sensitivity of approximate to 0.40, and good mechanical durability (a 5.8% reduction in relative capacitance change after 10 000 cycles). Moreover, this sensor maintains its performance after a self-healing test, proving its potential for the monitoring of human motion.
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