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The Aspect Ratio Dependence of the Fluorescence of Gold Nanorods: An Experimental and Theoretical Study

Published online by Cambridge University Press:  01 February 2011

Susie Eustis  and
Mostafa A. El-Sayed
Susie Eustis
Affiliation:
gte377x@mail.gatech.edu, Georgia Tech, School of Chemistry and Biochemistry, Atlanta, GA, 30309, United States, 404-894-4009
Mostafa A. El-Sayed
Affiliation:
mostafa.el-sayed@chemistry.gatech.edu, Georgia Tech, Laser Dynamics Laboratory, School of Chemistry and Biochemistry
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Abstract

Experimental observations and theoretical treatments are carried out for the band shape and relative intensity of the emission from gold nanorods of various aspect ratios in the range between 2.6 (1.5 theory) and 6.3 (9 theory). The calculation of the fluorescence spectra requires knowledge of the nanorod size distribution, the enhancement factors and the shape of the un-enhanced fluorescence spectrum. The comparison between the observed and calculated fluorescence band shapes is found to be good. The calculated changes in the relative intensities with aspect ratios are found to be much greater than that observed experimentally. This is due to the fact that for the observed emission of all the rods studied, nonradiative processes dominate the relaxation mechanism of the excited state, a fact that was not included in the theoretical treatments. Experimental results and theoretical treatments will be presented.

Keywords

nanostructureAuoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O02-07
Copyright
Copyright © Materials Research Society 2006

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