| Abstract
| - The optical properties of Au/Pt nanorods with different morphologies are analyzed in detail through comparisonof experimental UV−vis−NIR spectra and calculations based on the boundary element method (BEM). Thestudied morphologies refer to two different Pt deposition modes on Au nanorods, which have beenexperimentally realized through the presence or absence of Ag+ ions in solution. While in the absence ofAg+, complete overcoating was obtained, the presence of these ions induced preferential growth on the tips,as recently reported by us. The changes in the optical spectra are different for both Pt deposition modes, andthis is fully accounted for using appropriate geometrical models in the BEM calculations. The presence of Pttips is shown to lead to red-shifts of the longitudinal plasmon band because of geometrical effects, thoughaccompanied by damping due to increased absorption.
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