Optical extinction resonance of Au and Ag clusters formed by ion irradiation in SiO2 and Al2O3 |
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| Authors: | JC Pivin M Sendova-Vassileva M Nikolaeva D Dimova-Malinovska A Martucci |
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| Institution: | (1) CSNSM, IN2P3-CNRS, Batiment 108, 91 405 Orsay Campus, France, FR;(2) Central Laboratory for Solar Energy and New Energy Sources, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, 1784 Sofia, Bulgaria, BG;(3) Departimento di Ingegneria Meccanica, Settore Materiali, Universita di Padova, via Marzolo 9, 35 131 Padova, Italy, IT |
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| Abstract: | Three methods based on ion-beam irradiation were used to fabricate Ag and Au colloids in silica and alumina. Their surface-plasmon
resonance in the visible was characterised by transmittance measurements and interpreted on the basis of transmission electron
microscope observations. Despite their bimodal size distribution, particles formed by ion-beam mixing of sandwich layers exhibit
much narrower resonances than those obtained by ion implantation. This unusual effect of an inhomogeneity in cluster size
is ascribed to the spatial organisation of these clusters. Irradiation of supersaturated solid solutions at much lower ion
fluences produces colloids with more uniform size and spatial distributions, and equally strong resonances.
Received: 17 March 2001 / Accepted: 31 July 2001 / Published online: 11 February 2002 |
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| Keywords: | PACS: 78 20 -e 78 66 Vs 61 46 +w 61 80 Jh |
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