la803900w_si_001.pdf (179.82 kB)
Multiple Surface Plasmon Modes for Gold/Silver Alloy Nanorods
journal contribution
posted on 2009-05-05, 00:00 authored by Hye-Mi Bok, Kevin
L. Shuford, Sungwan Kim, Seong Kyu Kim, Sungho ParkAlloy nanorods consisting of bimetallic gold and silver are synthesized
by employing the electrochemical codeposition of Au/Ag alloy materials
into the pores of anodized aluminum oxide templates. This paper presents
the variation of localized surface plasmon resonance (LSPR) modes
of the Aux/Ag1−x alloy nanorods as a function of relative compositions of Au
and Ag. Transverse and multiple longitudinal modes were observed when
the length was longer than ca. 300 nm. For a given length, the transverse
LSPR mode systematically blue-shifted as the Ag portion increased,
while there was little variation in peak positions of the longitudinal
LSPR modes. The optical properties of the Aux/Ag1−x alloy nanorods were
calculated using the discrete dipole approximation and showed a good
agreement with the experimental measurements.