Surface Plasmon Coupling
on Linked Au–Pt Nanorods
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Abstract
This work demonstrates that surface plasmon coupling
in linked
Au–Pt NRs (NRs) can be controlled by adjusting the relative
ratio of material segment lengths. The NRs were synthesized through
an anodic aluminum oxide template assisted sequential electrochemical
deposition route. Optical spectra of the NRs in solution were acquired
in the UV–vis–NIR region to examine surface plasmon
coupling. Analysis of the spectra indicated that effective surface
plasmon coupling could occur in Au-dominated NRs but not in Pt-dominated
ones. The optical properties of Au–Pt–Au three-segment
NRs were also examined, and the results provided further clarification
regarding the conditions that yield effective coupling of NR segments
in these structures. Electrodynamics calculations on two- and three-segment
NRs were performed and found to be in good agreement with experiment.
These findings regarding surface plasmon coupling of linked, hybrid
NRs extend the fundamental knowledge of surface plasmon coupling from
single component to hybrid systems and are useful for a variety of
applications that necessitate fine controllability of the plasmonic
properties