Journal
ACS NANO
Volume 9, Issue 11, Pages 10876-10886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03864
Keywords
silver nanoflowers; polyurethane; stretchable conductive fibers; elasticity; strength
Categories
Funding
- Ministry of Trade, Industry Energy [10048884]
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2014R1A2A1A10050639]
- Fundamental Technology Research Program through NRF - Korean government (MSIP) [2014M3A7B4052200]
- [IBS-R011-D1]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10048884] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R011-D1-2015-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2014R1A2A1A10050639, 2014M3A7B4052200] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 5 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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