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Updated: Jun 4, 2025
Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
Published on: November 7, 2016
Cellulose nanofibril enhanced ionic conductive hydrogels with high stretchability, high toughness and self-adhesive
Mengqian Shi1, Ya Liang1, Chengyu Zhang2
1State Key Laboratory of Metastable Materials Science and Technology, Hebei Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Nanobiotechnology, Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, Yanshan University, Qinhuangdao 066004, China.
Abstract:
Preparation of ion-conductive hydrogels with excellent mechanics, good conductivity and adhesiveness is promising for flexible sensors, but remains a challenge. Here, we prepare a self-adhesive and ion-conductive hydrogel by introducing cellulose nanofibers (CNF) and ZnSO4 into a covalently-crosslinked poly (acrylamide-co-2-acrylamide-2-methyl propane sulfonic acid) (P(AM-co-AMPS)) network. Owing to the hydrogen bonding and metal coordination interactions among P(AM-co-AMPS) chains, CNF, and Zn2+, the resulting P(AM-co-AMPS)/CNF/ZnSO4 hydrogel exhibits high stretchability (1092 %), high toughness (244 kJ m-3), and skin-like elasticity (3.53 kPa). Moreover, the hydrogel has strong adhesion with different substrates by multiple non-covalent interfacial interactions. The SO3- on AMPS and COO- on CNF largely promptes the ionic migration (Zn2+, SO42-) through electrostatic interaction and hydrogen bonding, thus the hydrogel has high ion conductivity (5.85 S m-1). Finally, this hydrogel has high strain-sensitivity in a wide strain range, exhibiting great potential applications in wearable sensors.
