Optical properties of mixed clusters: comparative study of Ni/Ag and Pt/Ag clusters |
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| Authors: | E Cottancin M Gaudry M Pellarin J Lermé L Arnaud J R Huntzinger J L Vialle M Treilleux P Mélinon J-L Rousset and M Broyer |
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| Institution: | (1) Laboratoire de Spectrométrie Ionique et Moléculaire, CNRS and Université Lyon I, bâtiment Kastler, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France;(2) Département de Physique des Matériaux, CNRS and Université Lyon I, bâtiment Brillouin, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France;(3) Institut de Recherche sur la Catalyse, CNRS, 2 avenue Albert Einstein, 69626 Villeurbanne Cedex, France |
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| 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. |
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| Keywords: | 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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