Quasiquenching Size Effects in Gold Nanoclusters Embedded in Silica Matrix
Journal
Chemical Physics Letters
Journal Volume
370
Journal Issue
1-2
Pages
254-260
Date Issued
2003
Author(s)
S. Dhara
R. Kesavamoorthy
P. Magudapathy
M. Premila
B. K. Panigrahi
K. G. M. Nair
C. T. Wu
K. H. Chen
Abstract
The surface plasmon energy of gold clusters formed by Ar + ion beam mixing of Au/silica is investigated for the size effect. The redshift with decreasing cluster size is assigned to the 'spillout' effect in small clusters (<5 nm). Core-electron contribution to the metal dielectric function is mainly responsible for the blueshift with decreasing cluster size (quenching of the size effect) in case of bigger cluster size (>5 nm), assisted with annealing treatment. The competition between 'spillout' effect and the frequency dependence of interband dielectric function leads to a quasiquenching of the size effects in the optical response. © 2003 Elsevier Science B.V. All rights reserved.
Publisher
Elsevier B.V.
Type
journal article