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Excitation Energy Transfer between Non-Spherical Metal Nanoparticles: Effects of Shape and Orientation on Distance Dependence of Transfer Rate

Saini, Sangeeta and Shenoy, Vijay B and Bagchi, Biman (2008) Excitation Energy Transfer between Non-Spherical Metal Nanoparticles: Effects of Shape and Orientation on Distance Dependence of Transfer Rate. In: Journal of Physical Chemistry C, 112 (16). 6299 -6306.

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Abstract

Surface plasmon mediated excitation energy transfer (EET) between two nonspherical metal nanoparticles (MNP) is studied through a microscopic theoretical formulation that provides quantitative information about the distance, size, shape, and orientation dependence of the transfer rate. At constant separation, the EET rate increases with increase in the size of the nanoparticle and decreases with increase in the aspect ratio of the particle. The relative orientation of the nanoparticles is found to markedly influence the center-to-center distance (r) dependence of the excitation energy transfer rate. At intermediate separations, we find a significant deviation from $1/r^6$ dependence (which is robust for spherical particles at these separations), and it becomes more pronounced with increase in the aspect ratio of the particles. Interestingly, the relative orientation of the nanoparticles effect the surface-to-surface distance (d) dependence of the rate to lesser extend in comparison to the r-dependence of the rate. Our results suggest that for nonspherical particles studying EET rate as a function of d (not r) provides more conclusive results.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 May 2008
Last Modified: 19 Sep 2010 04:44
URI: http://eprints.iisc.ernet.in/id/eprint/13966

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