Abstract
Co-Ni alloy nanowires were in situ sheathed inside carbon nanotubes by a detonation-assisted chemical vapor deposition. The nanowires exhibit an unusual high-density lamellar-twinned structure. The observations of the frozen intermediates suggested that the nanowires form from a fusion of small alloy particles. The formation of the unusual high-density lamellar-twinned structures is associated with a confinement effect of the closed narrow channels of carbon nanotubes. Within the channels, the fusion of Co-Ni alloy particles proceeds in a unique kinetic environment, in which high-density lamellar twinning boundaries are formed to meet a quick reduction of excess energy.
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