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Highly Conductive Fiber with Waterproof and Self-Cleaning Properties for Textile Electronics

  • Byungwoo Choi
    Byungwoo Choi
    Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
  • Jaehong Lee
    Jaehong Lee
    Laboratory of Biosensors and Bioelectronics, ETH Zürich, Gloriastrasse 35, 8092 Zurich, Switzerland
    More by Jaehong Lee
  • Heetak Han
    Heetak Han
    Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
    More by Heetak Han
  • Janghoon Woo
    Janghoon Woo
    Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
    More by Janghoon Woo
  • Kijun Park
    Kijun Park
    Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
    Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea
    More by Kijun Park
  • Jungmok Seo*
    Jungmok Seo
    Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea
    Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
    *E-mail: [email protected] (J.S.).
    More by Jungmok Seo
  • , and 
  • Taeyoon Lee*
    Taeyoon Lee
    Nanobio Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
    *E-mail: [email protected] (T.L.).
    More by Taeyoon Lee
Cite this: ACS Appl. Mater. Interfaces 2018, 10, 42, 36094–36101
Publication Date (Web):September 17, 2018
Copyright © 2018 American Chemical Society

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    Abstract Image

    Major concerns in the development of wearable textile electronics are exposure to moisture and contamination. The exposure can cause electrical breakdown of the device and its interconnections, and thus continuous efforts have been made to fabricate textile electronics which are free from moisture and pollution. Herein, we developed a highly conductive and waterproof fiber with excellent electrical conductivity (0.11 Ω/cm) and mechanical stability for advanced interconnector components in wearable textile electronics. The fabrication process of the highly conductive fiber involves coating of a commercial Kevlar fiber with Ag nanoparticle–poly(styrene-block-butadiene-block-styrene) polymer composites. The fabricated fiber then gets treated with self-assembled monolayer (SAM)-forming reagents, which yields waterproof and self-cleaning properties. To find optimal SAM-forming reagents, four different kinds of reagents involving 1-decane thiol (DT), 1H,1H,2H,2H-perfluorohexanethiol, 1H,1H,2H,2H-perfluorodecyltrichlorosilane, 1H,1H,2H,2H-perfluodecanethiol (PFDT) were compared in terms of their thiol group and carbon chain lengths. Among the SAM-forming reagents, the PFDT-treated conductive fiber showed superior waterproof and self-cleaning property, as well as great sustainability in the water with varying pH because of nanoscale roughness and low surface energy. In addition, the functionality of the conductive fiber was tested under mechanical compression via repeated washing and folding processes. The developed conductive fiber with waterproof and self-cleaning property has promising applications in the interconnector operated under water and textile electronics.

    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b10217.

    • Resistance change according to the reduction cycle of the Ag NP-SBS polymer composite, TGA analysis of the conductive fiber according to the reduction cycle, AFM analysis of surface of SBS-coated fiber and conductive fiber, and surface energy of DT, PFHT, FDTS, and PFDT (PDF)

    • Waterproof conductive fiber (PDF)

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