Size and concentration effects in the optical properties of alloyed (AuxAg1 - x)n and core-shell (NixAg1 - x)n embedded clusters View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-10

AUTHORS

M. Gaudry, J. Lermé, E. Cottancin, M. Pellarin, B. Prével, M. Treilleux, P. Mélinon, J.-L. Rousset, M. Broyer

ABSTRACT

Optical properties of mixed clusters (AuxAg 1 - x)n and (NixAg 1 - x)n, produced by laser vaporization and embedded in an alumina matrix, are reported. The size effects are investigated for different concentrations (x = 0.25, 0.5 and 0.75) in the diameter range 2-4 nm. For alloyed clusters (AuxAg 1 - x)n of a given size an almost linear evolution of the surface plasmon frequency ωs with the concentration is observed (between those of pure gold and pure silver clusters). Moreover the blue-shift and the damping of the resonance with decreasing size is all the more important as the gold concentration in the particles increases. Such results are in agreement with theoretical calculations carried out in the frame of the time-dependent local-density-approximation (TDLDA) including an inner skin of ineffective screening and the porosity of the matrix. The optical response of (NixAg 1 - x)n clusters exhibits a surface plasmon resonance in the same spectral range as the one observed for pure silver clusters, but considerably damped and broadened. For a given mean cluster size 3.0 nm, a blue-shift of the resonance is observed when increasing the nickel concentration (between x = 0.25 and x = 0.75). The results are in good qualitative agreement with classical predictions in the dipolar approximation, assuming a core-shell geometry. More... »

PAGES

201-204

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s100530170092

DOI

http://dx.doi.org/10.1007/s100530170092

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034281834


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