Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 176, Issue -, Pages 78-86Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.02.055
Keywords
Lignin; Nanoparticle; Hydrogel
Funding
- National Natural Science Foundation of China [32071720]
- Young Elite Scientists Sponsorship Program by Tianjin [TJSQNTJ-2017-19, AWS18J004]
- Foundation of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences [KF201912]
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This study demonstrates a green and simple design strategy for piezoresistive pressure sensors based on nanocomposite hydrogel, using hybrid organic-inorganic nanoparticles synthesized from alkaline lignin and silver nanoparticles. The novel nanomaterial effectively enhances the compressibility, pressure sensitivity, and signal response stability of the hydrogel.
Hydrogel-based piezoresistive sensors have high practical value in many revolutionary applications, such as intelligent and electronic devices. However, with existing hydrogels, it is very difficult to achieve a combination of good mechanical properties, stable conductivity, and simple/green fabrication method. In this study, hybrid organic-inorganic nanoparticles (lignin-silver hybrid nanoparticles, Lig-Ag NPs) were synthesized by using alkaline lignin as the organic component and silver nanoparticle (Ag NPs) as the inorganic component. Interaction between the lignin and Ag NPs leads to the composite of hybrid nanoparticles that not only decreased the release of Ag NPs but also generated dynamically stable semi-quinone radicals in lignin. After compositing with polyvinyl alcohol (PVA) matrix, Lig-Ag NPs provided strong sacrificial hydrogen bonds and facilitated the delivery of electronic. Benefiting from these structural features and the pore-forming effect of ammonia (from Lig-Ag NPs solution), the PVA/Lig-Ag NPs hydrogel exhibits outstanding compressibility, pressure sensitivity, and stability of signal response. This study provides a green and simple design strategy for piezoresistive pressure sensors based on nanocomposite hydrogel. (c) 2021 Elsevier B.V. All rights reserved.
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