Polysaccharide-based high-strength, self-healing and ultra-sensitive wearable sensors

As abundant, biodegradable, and biocompatible materials, polysaccharides have received great attention in many fields. Ionic conductive hydrogels based on sodium alginate and its derivatives have been extensively studied in the field of wearable sensors due to their low cost, non-toxic and biocompat...

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Bibliographic Details
Published inIndustrial crops and products Vol. 178; p. 114618
Main Authors Wang, Jing, Dai, Tianyi, Lin, Yankun, Jia, Hongbing, Ji, Qingmin, Yuan, Guoliang
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2022
Subjects
High-strength
Hydrogel
Polysaccharide
Self-healing
High-strength
Self-healing
Hydrogel
Polysaccharide
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Summary:As abundant, biodegradable, and biocompatible materials, polysaccharides have received great attention in many fields. Ionic conductive hydrogels based on sodium alginate and its derivatives have been extensively studied in the field of wearable sensors due to their low cost, non-toxic and biocompatible. However, the inherent low mechanical strength of hydrogels leads to poor accuracy and durability of electrical signals under high loads. Herein, the intelligent ionic hydrogels based on oxide sodium alginate (OSA), poly (acrylamide-co-acrylic acid) (PACA), and FeCl3 were synthesized by a simple one-pot method. Reversible imine and hydrogen bonds between OSA and PACA, and coordination interactions among PACA, OSA, and Fe3+ were successfully designed to provide hydrogels with excellent elongation at break (830%), strong tensile strength (370 kPa), and high self-healing efficiency (90%). They also show controlled conductivity and high tensile sensitivity (Gauge factor, GF=7.8) for accurate and stable detection of human movement and physiological stimuli. Given these findings, the developed polysaccharide-based hydrogels represent a great application prospect in strain sensors for wearable electronic devices, soft robotics, and human-machine interfaces. •A simple one-pot method was used to develop polysaccharide-based hydrogel.•Strength and self-healing were achieved by introducing polysaccharides.•Hydrogel had high sensitivity and electrical signal stability.•Hydrogel could detect human movement and physiological stimuli.
ISSN:0926-6690
1872-633X
DOI:10.1016/j.indcrop.2022.114618