Size-dependent hardness of five-fold twin structured Ag nanowires

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In this study, the size dependent hardness of silver nanowires with a five-fold twin structure was examined using nanoindentation. As the diameter of the nanowires is reduced, the five-fold twin boundaries restrict the dislocation motion, and therefore a size dependent plasticity is expected for these uniquely structured nanowires. The polyol reduction method with modifications was used to synthesize silver nanowires with different diameters in the range of 70 nm to 144 nm. The nanoindentation experiments were performed on silver nanowires deposited on a stiff MgO substrate, and the resulting h, P, and S data were analyzed using the analytical double contact model for nanowire indentation. The hardness of the nanowires determined using the double contact model showed an increase in the hardness with reduction in the diameter of the nanowires, as expected due to the presence of the twin boundaries. The hardness values determined using the analytical double contact model compared favorably to the hardness values calculated from the contact areas that were extracted from finite element method simulations of an elastic indentation into the silver nanowires on the MgO substrate.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2017
Language
English
Article Type
Article
Keywords

MECHANICAL-PROPERTIES; SILVER NANOWIRES; TRANSPARENT ELECTRODE; NUMERICAL-SIMULATION; CRYSTAL PLASTICITY; OPTICAL-PROPERTIES; ELASTIC-MODULUS; THIN-FILM; NANOINDENTATION; SUBSTRATE

Citation

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.19, no.2, pp.1311 - 1319

ISSN
1463-9076
DOI
10.1039/c6cp07424c
URI
http://hdl.handle.net/10203/220957
Appears in Collection
EEW-Journal Papers(저널논문)
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