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    Extraordinarily High Conductivity of Stretchable Fibers of Polyurethane and Silver Nanoflowers
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    † ‡ †Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), and ‡School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
    *Address correspondence to [email protected]
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    ACS Nano

    Cite this: ACS Nano 2015, 9, 11, 10876–10886
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    https://doi.org/10.1021/acsnano.5b03864
    Published October 20, 2015
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    Stretchable conductive composites have received considerable attention recently, and they should have high conductivity and mechanical strength. Here we report highly conductive stretchable fibers synthesized by the scalable wet spinning process using flower-shaped silver nanoparticles with nanodisc-shaped petals (Ag nanoflowers) and polyurethane. An extraordinarily high conductivity (41 245 S cm–1) was obtained by Ag nanoflowers, which is 2 orders of magnitude greater than that of fibers synthesized using spherical Ag nanoparticles. This was due to the enhanced surface area and vigorous coalescence of nanodisc-shaped petals during the curing process. There was a trade-off relationship between conductivity and stretchability, and the maximum rupture strain was 776%. An analytical model revealed that the enhanced adhesion between Ag nanoflowers and polyurethane provided a high Young’s modulus (731.5 MPa) and ultimate strength (39.6 MPa) of the fibers. The fibers exhibited an elastic property after prestretching, and the resistance change of weft-knitted fabric was negligible up to 200% strain. The fibers with extraordinarily high conductivity, stretchability, and mechanical strength may be useful for wearable electronics applications.

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    • Additional data, SEM analysis, differential scanning calorimetry analysis, thermogravimetric analysis, energy dispersive X-ray analysis, optical images of ropes and weft-knitted fabric, and theoretical analysis (PDF)

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