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In relation to this article, we declare that there is no conflict of interest.
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Received July 9, 2022
Accepted October 5, 2022
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Conductive double-network hydrogel composed of sodium alginate, polyacrylamide, and reduced graphene oxide

School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea
Korean Journal of Chemical Engineering, February 2023, 40(2), 352-360(9), 10.1007/s11814-022-1311-0
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Abstract

Conductive hydrogels have garnered considerable attention as novel materials for biomedical devices and tissue engineering because they exhibit electroactivity and tissue-like softness. Various composites and manufacturing techniques have been developed in this regard. However, conductive hydrogels often exhibit poor mechanical properties (e.g., low toughness), which impedes their biomedical application. In this study, we fabricated double network (DN) hydrogels composed of sodium alginate (SA), polyacrylamide (PAAm), and graphene oxide (GO) to promote elasticity, toughness, and mechanical strength. Subsequently, we reduced the composite hydrogels to improve electrical conductivity by converting GO to more conductive reduced graphene oxide (rGO). The electrical, electrochemical, and mechanical properties of the produced hydrogels, r(GO/SA/PAAm), were characterized. Particularly, crosslinking density and reducing time were varied to obtain optimal conditions. The produced r(GO/SA/PAAm) demonstrated excellent electrical conductivity, mechanical strength, and toughness compared to homopolymers and unreduced DN hydrogels. We demonstrated that conductive DN hydrogels are suitable strain sensors. Electrically conductive and mechanically strong hydrogels will be beneficial in various biomedical applications, such as tissue engineering scaffolds and bioelectrodes.

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