UNUSUAL EXTINCTION SPECTRA OF NANOMETER-SIZED SILVER PARTICLES ARRANGED IN 2-DIMENSIONAL ARRAYS

Citation
G. Chumanov et al., UNUSUAL EXTINCTION SPECTRA OF NANOMETER-SIZED SILVER PARTICLES ARRANGED IN 2-DIMENSIONAL ARRAYS, Journal of physical chemistry, 100(13), 1996, pp. 5166-5168
Citations number
19
Categorie Soggetti
Chemistry Physical
ISSN journal
00223654
Volume
100
Issue
13
Year of publication
1996
Pages
5166 - 5168
Database
ISI
SICI code
0022-3654(1996)100:13<5166:UESONS>2.0.ZU;2-E
Abstract
Two-dimensional arrays of 1000 Angstrom silver particles were prepared by adsorption from colloidal suspensions onto glass slides derivatize d with (3-mercaptopropyl)trimethoxysilane. By variation of the concent ration of the colloidal suspensions, slides with different interpartic le distances were obtained, and their extinction spectra were measured in water. A blue shift (up to 90 nm) and sharpening of the peak corre sponding to the plasmon resonance was observed as the distance between particles decreased to a value comparable to, or less than, their dia meter. The angular dependence of the extinction spectra was studied fo r s- and p-polarized light. The data are interpreted to result from co herent coupling of the plasmon resonances in closely spaced silver par ticles upon irradiation with light.