Journal
ACS APPLIED POLYMER MATERIALS
Volume 4, Issue 5, Pages 3394-3407Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.2c00028
Keywords
wearable flexible sensors; self-healing hydrogels; Janus nanosheets; Pickering emulsion; RAFT polymerization
Funding
- Natural Science Foundation of Shandong Province [ZR2021MB124]
- National Natural Science Foundation of China [51773086, 51973086]
- Key Research and Development Program of Shandong Province [2019GGX102012]
- Project of Shandong Province Higher Educational Science [2019KJA011]
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In this study, a flexible sensor using self-healing hydrogels with Janus nanosheets was developed. The sensor exhibited outstanding flexibility, high sensitivity, and excellent durability, and could accurately monitor various human movements.
Flexible and wearable sensors based on nanocomposite hydrogels have been used to monitor human physiological signals. However, it is still a challenge to develop flexible sensors using self-healing hydrogels with the properties of biocompatibility and flexibility. In this manuscript, Janus nanosheets were implanted into guar gum (GG)/poly(vinyl alcohol) (PVA) 3-dimensional network structure. The obtained flexible sensor with nanocomposite hydrogels had outstanding flexibility, high sensitivity, and excellent durability. In typical oil-in-water (O/W) Pickering emulsion, GO-poly(4-vinylphenylboronic acid)/polydopamine Janus nanosheets (JNs) were surface-initiated with 4-vinyl-phenylboronic acid (4VPBA) on the side of GO by RAFT polymerization and self-polymeriztion of dopamine (DA) on the other side by mussel-inspired chemistry, respectively. The JNs hydrogels had the preferable mechanical strength (1.0 MPa) and self-healing efficiency (93.1%) in the presence of reversible interaction. The resistive-type hydrogels sensor with these JNs hydrogels exhibited high sensitivity (gauge factor (GF) = 12.5) and antifatigue sensing performance (100% strain, 600 cycles). The sensor could monitor different human movements, which includes both large-scale (wrist bending, elbow bending, and running) and small-scale (cough vibrations, pulse rates, and finger bending) motion precisely. These nanocomposite hydrogels will provide strategies for wearable flexible sensors with superior stability and repeatability.
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