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Optical properties of mixed clusters: comparative study of Ni/Ag and Pt/Ag clusters

  • E. Cottancin
  • M. Gaudry
  • M. Pellarin
  • J. Lermé
  • L. Arnaud
  • J. R. Huntzinger
  • J. L. Vialle
  • M. Treilleux
  • P. Mélinon
  • J.-L. Rousset
  • M. Broyer

Abstract.

The optical properties of mixed (Ni0.5Ag0.5)n and Pt/Ag clusters are investigated in the size range 2-5 nm. Low Energy Ion Spectroscopy (LEIS) experiments show that the cluster surface is entirely covered by silver atoms for the two systems. The optical spectra of Ni/Ag clusters exhibit a large Surface Plasmon Resonance (SPR), damped and widened when the cluster size decreases, in agreement with a classical model assuming a core-shell geometry and including the reduction of the conduction electron mean-free path in the silver shell. For Pt/Ag clusters, no SPR emerges in the size range 2-5 nm, although it is predicted within a classical model, a pronounced SPR appearing only for clusters larger than 10 nm in diameter.

PACS.

36.40.Vz Optical properties of clusters 36.40.-c Atomic and molecular clusters 78.66.Bz Metals and metallic alloys 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2003

Authors and Affiliations

  • E. Cottancin
    • 1
  • M. Gaudry
    • 1
  • M. Pellarin
    • 1
  • J. Lermé
    • 1
  • L. Arnaud
    • 1
  • J. R. Huntzinger
    • 1
  • J. L. Vialle
    • 1
  • M. Treilleux
    • 2
  • P. Mélinon
    • 2
  • J.-L. Rousset
    • 3
  • M. Broyer
    • 1
  1. 1.Laboratoire de Spectrométrie Ionique et MoléculaireCNRS and Université Lyon I, bâtiment KastlerVilleurbanne CedexFrance
  2. 2.Département de Physique des MatériauxCNRS and Université Lyon I, bâtiment BrillouinVilleurbanne CedexFrance
  3. 3.Institut de Recherche sur la Catalyse, CNRSVilleurbanne CedexFrance

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