한빛사논문
서울대학교, IBS
Dongjun Jung1,2,⊥, Yeongjun Kim1,2,⊥, Hyunjin Lee1,2,⊥, Sonwoo Jung1,2, Chansul Park1,2, Taeghwan Hyeon1,2, Dae-Hyeong Kim1,2,3,*
1Center for Nanoparticle Research, Institute for Basic Science(IBS), Seoul 08826, Republic of Korea
2School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea
3Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
⊥These authors contributed equally to this work.
*To whom correspondence should be addressed.
Abstract
Stretchable conductive nanocomposites have been intensively studied for wearable bioelectronics. However, development of nanocomposites that simultaneously feature metal-like conductivity (> 100,000 S/cm) and high stretchability (> 100%) for high-performance skin-mountable devices is still extremely challenging. Here we present a material strategy for such a nanocomposite by using local bundling of silver nanowires stabilized with dual ligands (i.e., 1-propanethiols and 1-decanethiols). When the nanocomposite was solidified via solvent evaporation under a highly humid condition, the nanowires in the organic solution are bundled and stabilized. The resulting locally-bundled nanowires lower contact resistance while maintain their percolation network, leading to high conductivity. Dual ligands of 1-propanethiol and 1-decanethiol further boost up the conductivity. As a result, a nanocomposite with both high conductivity of ∼ 122,120 S/cm and high stretchability of ∼ 200% is obtained. Such superb electrical and mechanical properties are critical for various applications in skin-like electronics, and we herein demonstrated a wearable thermo-stimulation device.
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