Abstract
Metallically conducting flexible alginate fibers with superior mechanical strength and environmental stability was obtained by metal ion-exchange using a simply modified continuous wet-spinning process. Spinning solution was prepared by dissolving Na-alginate polymer in distilled water, followed by spinning into CaCl2 coagulation bath to form Ca-alginate swollen gel fiber. The Ca-alginate fiber was then immersed into AgNO3 aqueous solution for incorporation of Ag+ ion into the swollen Ca-alginate alginate fiber, resulting in the alginate fiber complexed with both Ca++ and Ag+ ions (Ag/Ca-alginate fiber). The Ag/Ca-alginate fiber was finally immersed into aqueous dimethylamine borane complex (DMAB) reduction solution, reducing Ag+ ions to Ag nanoparticles (AgNP) in the fiber. The AgNP embedded Ca-alginate conducting fiber (AgNP/Ca-alginate fiber) was washed with distilled water several times and dried. It was observed that AgNPs were uniformly formed and dispersed both on the surface and inside of the AgNP/Ca-alginate fiber. The fiber exhibits superior room temperature electrical conductivity and mechanical strength as high as 2,000 S/cm and 290 MPa, respectively. The AgNP/ Ca-alginate fiber also possessed excellent environmental stability, showing little conductivity change even after 800 hours under a harsh 60 oC and 70% relative humidity condition. Conductive fabric with extremely low surface resistivity of 0.6 Ω/□ could be fabricated using the AgNP/Ca-alginate fibers.
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Acknowledgments: This research was financially supported by Ministry of Trade, Industry and Energy of Korea (10048884) and National Research Foundation (NRF) of Korea (Ministry of Science and ICT) (2014-M3A7B4052200 and 2010-0027955). This research was also supported by the Korea Institute of Industrial Technology as “Development of smart textronic products based on electronic fibers and textiles (Kitech JA-17-0045)”.
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Lee, T.H., Kim, J.H. & Lee, J.Y. Fabrication of highly conductive fibers by metal ion-exchange using a simply modified wet-spinning process. Macromol. Res. 25, 1230–1236 (2017). https://doi.org/10.1007/s13233-017-5167-9
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DOI: https://doi.org/10.1007/s13233-017-5167-9