Journal
NANOSCALE
Volume 10, Issue 21, Pages 9862-9866Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr02875c
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Funding
- Ministry of Science and Technology, Taiwan [MOST 102-2221-E-007-048-MY3, MOST 105-2221-E-007-016-MY2]
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Lattice-mismatch is an important factor for the heteroepitaxial growth of core-shell nanostructures. A large lattice-mismatch usually leads to a non-coherent interface or a polycrystalline shell layer. In this study, a conformal Ag layer is coated on Cu nanowires with dense nanoscale twin boundaries through a galvanic replacement reaction. Despite a large lattice mismatch between Ag and Cu (approximate to 12.6%), the Ag shell replicates the twinning structure in Cu nanowires and grows epitaxially on the nanotwinned Cu nanowire. A twin-mediated growth mechanism is proposed to explain the epitaxy of high lattice-mismatch bimetallic systems in which the misfit dislocations are accommodated by coherent twin boundaries.
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