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Conductive double-network hydrogel composed of sodium alginate, polyacrylamide, and reduced graphene oxide

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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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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2021R1A4A3025206) and a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare (HI14C3484).

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  1. These authors contributed equally.

Authors and Affiliations

  1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Korea

    Byongyeon Kim, Junggeon Park & Jae Young Lee

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  1. Byongyeon Kim
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  2. Junggeon Park
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  3. Jae Young Lee
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Corresponding author

Correspondence to Jae Young Lee.

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Credit Authorship Contribution Statement

Byongyeon Kim: Methodology, Investigation, Data curation, Writing — original draft, Formal analysis. Junggeon Park: Methodology, Investigation. Jae Young Lee: Conceptualization, Supervision, Writing — review & editing.

Conflict of Interest Statement

The authors declare no competing financial interest.

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Kim, B., Park, J. & Lee, J.Y. Conductive double-network hydrogel composed of sodium alginate, polyacrylamide, and reduced graphene oxide. Korean J. Chem. Eng. 40, 352–360 (2023). https://doi.org/10.1007/s11814-022-1311-0

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  • DOI: https://doi.org/10.1007/s11814-022-1311-0

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