Reflectance and SERS from an ordered array of gold nanorods

L.E.A. Berlouis, B.G. McMillan, F.R. Cruickshank, P.F. Brevet

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The optical properties of arrays of Au nanorods were studied by specular reflectance spectroscopy. The spectra were dominated by the surface plasmon modes of the Au nanoarrays superimposed on the effects of interference through the films. The longitudinal plasmon resonance moved to longer wavelength as the aspect ratio of the nanorods increased. The reflectance spectra were modelled by applying the Maxwell-Garnett approximation to a uniaxial thin film (composite Au/alumina) and this yielded a good match to the experimental data. SERS spectra on the Au nanorod arrays were recorded at different externally applied potentials and significant differences with respect to an electrochemically roughened Au electrode were revealed. These have been attributed to the nature of the composite nanoarrays, both their nanostructuring into rods and the regular arrangement of these rods.
Original languageEnglish
Pages (from-to)1157-1163
Number of pages7
JournalElectrochimica Acta
Volume53
Issue number3
DOIs
Publication statusPublished - 2007

Keywords

  • Au nanorods reflectance
  • uniaxial material
  • surface plasmons
  • reflectance
  • SERS

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