Electron tunneling of hierarchically structured silver nanosatellite particles for highly conductive healable nanocomposites

Daewoo Suh, K. P. Faseela, Wonjoon Kim, Chanyong Park, Jang Gyun Lim, Sungwon Seo, Moon Ki Kim, Hyungpil Moon and Seunghyun Baik ()
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Daewoo Suh: Sungkyunkwan University
K. P. Faseela: Sungkyunkwan University
Wonjoon Kim: Sungkyunkwan University
Chanyong Park: Sungkyunkwan University
Jang Gyun Lim: Sungkyunkwan University
Sungwon Seo: Sungkyunkwan University
Moon Ki Kim: Sungkyunkwan University
Hyungpil Moon: Sungkyunkwan University
Seunghyun Baik: Sungkyunkwan University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Healable conductive materials have received considerable attention. However, their practical applications are impeded by low electrical conductivity and irreversible degradation after breaking/healing cycles. Here we report a highly conductive completely reversible electron tunneling-assisted percolation network of silver nanosatellite particles for putty-like moldable and healable nanocomposites. The densely and uniformly distributed silver nanosatellite particles with a bimodal size distribution are generated by the radical and reactive oxygen species-mediated vigorous etching and reduction reaction of silver flakes using tetrahydrofuran peroxide in a silicone rubber matrix. The close work function match between silicone and silver enables electron tunneling between nanosatellite particles, increasing electrical conductivity by ~5 orders of magnitude (1.02×103 Scm−1) without coalescence of fillers. This results in ~100% electrical healing efficiency after 1000 breaking/healing cycles and stability under water immersion and 6-month exposure to ambient air. The highly conductive moldable nanocomposite may find applications in improvising and healing electrical parts.

Date: 2020
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DOI: 10.1038/s41467-020-15709-8

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