Cavity ring-down spectroscopy of metallic gold nanoparticles

S. Gilb, K. Hartl, A. Kartouzian, J. Peter, U. Heiz, H. G. Boyen, P. Ziemann

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The optical properties of supported gold nanoparticles with sizes of 1.3 nm, 1.6 nm, 2.5 nm, and 2.9 nm have been studies by using cavity ring-down spectroscopy in the photon energy range between 1.8 eV and 3.0 eV. The obtained results show the possibility to obtain optical information of nanoassembled materials with high sensitivity. The experimental findings are compared to calculations using Mie-Drude theory. Whereas the broadening of the surface plasmon resonance with decreasing size is well described by this model, the observed blue-shift of the surface plasmon resonance contradicts the predictions of the Mie-Drude theory. The latter effect can be explained by the presence of a skin region with decreased polarizability typical for coinage metal particles. Furthermore, it is found that the supported gold nanoparticles are robust under ambient conditions, an important issue when using these materials for optical applications.

Original languageEnglish
Pages (from-to)501-506
Number of pages6
JournalEuropean Physical Journal D
Volume45
Issue number3
DOIs
StatePublished - Dec 2007
Externally publishedYes

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