Controlling the Topography and Surface Plasmon Resonance
of Gold Nanoshells by a Templated Surfactant-Assisted Seed Growth
Method
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Abstract
Gold
nanoshells with varying surface topographies and tunable SPR
bands were synthesized in high yields by the templated surfactant-assisted
seed growth method. By changing the types and amounts of surfactants
and ionic additives in the growth solution, the nanoshell topography
was controlled from smooth shells to highly structured nanoshells
composed of spherical nanoparticles or sharp spikes of varying aspect
ratios. The SPR band of the nanoshells could be tuned over a wide
range of wavelengths by varying the nanoshell topography, without
significantly changing the amount of gold. Finite-difference time-domain
(FDTD) modeling was used to predict and understand the optical properties
of nanoshells composed of various subparticles, providing insight
into the origins of the tunable SPR band