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Proceedings Paper

Dynamics and two-photon absorption properties of chromophore functionalized semiconductor nanoparticles
Author(s): Shankar Varaganti; Mathias Gessesse; Sherine O. Obare; Guda Ramakrishna
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Paper Abstract

Two photon absorption cross-sections and fluorescence dynamics of Riboflavin, Fluorescein 548, Coumarin 519 and Quinizarin adsorbed onto reactive (TiO2) and non-reactive (ZrO2) semiconductor nanoparticles have been investigated. These dye molecules are chosen because of their inherently different anchoring groups with which they can bind to semiconductor nanoparticles giving a handle to probe the influence of anchoring group as well as molecule-nanoparticle electronic coupling on the two-photon absorption and nonlinear optical properties. Two-photon excited fluorescence technique has been utilized to monitor the two photon absorption cross-sections and the dynamics of singlet states are followed with femto second fluorescence upconversion. Interesting cross-section trends have been observed where the TPA cross-section of chromophore on ZrO2 surface is similar or lower to that of the free dye while the cross-sections seem to be higher on the surface of reactive TiO2 nanoparticle surface. Fluorescence upconversion investigations were able to probe the electronic interactions of the chromophore with semiconductor nanoparticle and also the adsorption of the chromophores on the surface of the nanoparticle.

Paper Details

Date Published: 21 August 2009
PDF: 10 pages
Proc. SPIE 7413, Linear and Nonlinear Optics of Organic Materials IX, 741309 (21 August 2009); doi: 10.1117/12.829276
Show Author Affiliations
Shankar Varaganti, Western Michigan Univ. (United States)
Mathias Gessesse, Western Michigan Univ. (United States)
Sherine O. Obare, Western Michigan Univ. (United States)
Guda Ramakrishna, Western Michigan Univ. (United States)

Published in SPIE Proceedings Vol. 7413:
Linear and Nonlinear Optics of Organic Materials IX
Theodore G. Goodson, Editor(s)

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