Abstract
Tadpole-shaped Au nano-particles with controllable tails are
successfully fabricated by simply using laser fragmentation of separated
Au nano-spheres in liquid. The optimum laser power densities
(1.5–3 GW/cm2) can enable part of the individual Au
nano-sphere to be re-melted, released, and ultra-rapidly
recondensed/crystallized on the outside of the original region. We find
that the length of the tail in a tadpole-shaped Au nano-particle
significantly increases from about 10 to 25 nm by increasing the laser
power density. Benefiting from the unique structural features, the
localized surface plasmon resonance (LSPR) absorption spectra of the
tadpole-shaped Au nano-particles become broader by increasing the tail
length. Moreover, the LSPR absorption band also exhibits a noticeable red
shift from about 520 to 650 nm. Our results provide a convenient and
valuable strategy to fabricated novel anisotropic-shaped nano-structures
with fascinating properties.
© 2016 Chinese Laser Press
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