Issue 5, 2014

Aspect-ratio- and size-dependent emergence of the surface-plasmon resonance in gold nanorods – an ab initio TDDFT study

Abstract

It is known that the surface-plasmon resonance (SPR) in small spherical Au nanoparticles of about 2 nm is strongly damped. We demonstrate that small Au nanorods with a high aspect ratio develop a strong longitudinal SPR, with intensity comparable to that in Ag rods, as soon as the resonance energy drops below the onset of the interband transitions due to the geometry. We present ab initio calculations of time-dependent density-functional theory of rods with lengths of up to 7 nm. By changing the length and width, not only the energy but also the character of the resonance in Au rods can be tuned. Moreover, the aspect ratio alone is not sufficient to predict the character of the spectrum; the absolute size matters.

Graphical abstract: Aspect-ratio- and size-dependent emergence of the surface-plasmon resonance in gold nanorods – an ab initio TDDFT study

Supplementary files

Article information

Article type
Communication
Submitted
05 Aug 2013
Accepted
14 Nov 2013
First published
15 Nov 2013

Phys. Chem. Chem. Phys., 2014,16, 1820-1823

Aspect-ratio- and size-dependent emergence of the surface-plasmon resonance in gold nanorods – an ab initio TDDFT study

X. López-Lozano, H. Barron, C. Mottet and H. Weissker, Phys. Chem. Chem. Phys., 2014, 16, 1820 DOI: 10.1039/C3CP53702A

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