Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 47, Pages 44642-44651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17030
Keywords
cellulose nanocrystals; cellulose nanofibers; polypyrrole; nanocomposites; skin sensors
Funding
- Zhejiang Provincial Natural Science key Foundation of China [LZ20E030003]
- Fundamental Research Funds of Zhejiang Sci-Tech university [2019QN09]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- NSERC
- Candidates of Young and Middle Aged Academic Leader of Zhejiang Province
- CelluForce
- FP Innovations
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Electronic skins are developed for applications such as biomedical sensors, robotic prosthetics, and human-machine interactions, which raise the interest in composite materials that possess both flexibility and sensing properties. Polypyrrole-coated cellulose nanocrystals and cellulose nanofibers were prepared using iron(III) chloride (FeCl3) oxidant, which were used to reinforce polyvinyl alcohol (PVA). The combination of weak H-bonds and iron coordination bonds and the synergistic effect of these components yielded self-healing nanocomposite films with robust mechanical strength (409% increase compared to pure PVA and high toughness up to 407.1%) and excellent adhesion (9670 times greater than its own weight) to various substrates in air and water. When damaged, the nanocomposite films displayed good mechanical (72.0-76.3%) and conductive (54.9-91.2%) recovery after a healing time of 30 min. More importantly, the flexible nanocomposites possessed high strain sensitivity under subtle strains (<48.5%) with a gauge factor (GF) of 2.52, which was relatively larger than the GF of ionic hydrogel-based skin sensors. These nanocomposite films possessed superior sensing performance for real-time monitoring of large and subtle human motions (finger bending motions, swallowing, and wrist pulse); thus, they have great potentials in health monitoring, smart flexible skin sensors. and wearable electronic devices.
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