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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Self-Healing of Nanoporous Gold Under Ambient Conditions

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Title
Self-Healing of Nanoporous Gold Under Ambient Conditions
Author
Gwak, Eun-JiJeon, HansolSong, EunjiKim, Ju-Young
Issue Date
2020-09
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.20, no.9, pp.6706 - 6711
Abstract
Failure of a material is an irreversible process since the material loses its original characteristics and properties. The catastrophic brittle failure under tensile stress of nanoporous gold (np-Au) with a bicontinuous open-cell structure makes impossible otherwise attractive applications. Here, we first demonstrate a self-healing process in tensile-fractured np-Au to overcome the limit of fragility via mechanically assisted cold-welding under ambient conditions. The self-healing ability of np-Au in terms of mechanical properties shows strength recovery up to 64.4% and fully recovered elastic modulus compared with initial tensile properties. Topological parameters obtained by three-dimensional reconstruction of self-healed np-Au clarify the strength, elastic modulus, and strain distribution. The self-healing process in np-Au is attributed to surface diffusion expedited by local compressive stress in the ultrasmall dimension of ligaments formed by ductile failures of individual ligaments.
URI
https://scholarworks.unist.ac.kr/handle/201301/48300
URL
https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.0c02551
DOI
10.1021/acs.nanolett.0c02551
ISSN
1530-6984
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