Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 8, Pages 2353-2360Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc05448g
Keywords
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Funding
- National Natural Science Foundation of China [51703165]
- Young Elite Scientist Sponsorship Program by CAST [2016QNRC001]
- Shanghai Science and Technology Commission [14DZ2261100]
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Regarding artificial intelligence and wearable soft electronics, increasing attention has been dedicated to hydrogel strain sensors. However, traditional hydrogels are insulating and fragile. To obtain a continuous and repeatable electrical signal output upon external stress or strain in a hydrogel, the combination of good mechanical property, good elasticity and high electrical conductivity is demanded. In order to apply hydrogel in the strain sensing field, in this work, a smart, flexible organic-inorganic polyanion polyacrylic acid (PAA) hybrid hydrogel is designed with nano barium ferrite (BaFe12O19) as a cross-linker without the addition of any chemically covalent or ionic cross-linkers, exhibiting a high ionic conductivity of 1.22 x 10(-2) S cm(-1). Due to high porosity as confirmed by scanning electron microscope (SEM), the BaFe12O19/PAA hybrid hydrogel demonstrates 100% recoverability and stable piezoresistive sensing performance with negligible hysteresis loops under cyclic compression loading tests compared with the N,N-methylene bisacrylamide chemically cross-linked PAA hydrogel. This demonstrates that the BaFe12O19/PAA hydrogel is not only favorable to be used as a candidate for strain sensors in soft electronics but also facilitates the evolution of a new generation of flexible, wearable, and human-friendly intelligent devices.
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