Blinking suppression and intensity recurrences in single CdSe-oligo (phenylene vinylene) nanostructures: experiment and kinetic model

Early, KT and McCarthy, KD and Hammer, NI and Odoi, MY and Tangirala, R and Emrick, T and Barnes, MD. (2007) Blinking suppression and intensity recurrences in single CdSe-oligo (phenylene vinylene) nanostructures: experiment and kinetic model. Nanotechnology, 18. ISSN 0957-4484

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Abstract

We report time-resolved single molecule fluorescence imaging of individual CdSe quantum dots that are functionalized with oligomeric conjugated organic ligands. The fluorescence intensity trajectories from these composite nanostructures display both a strong degree of blinking suppression and interesting intensity fluctuations with recurrence times on the order of 10-60 seconds (quantified by Fourier transform analysis). In addition, Time-Tagged-Time-Resolved (TTTR) fluorescence measurements of the fluorescence decay rate of individual hybrid nanostructures indicate significantly modified non-radiative decay rates relative to conventional ZnS-capped CdSe quantum dots. Modeling of fluorescence intensity trajectories using a diffusive reaction coordinate model shows that slow fluctuations in electron energies (1Se, 2Pe) can give rise to the recurrences via modified Auger-assisted hole-trapping rates. We briefly discuss a possible ligand-induced mechanism for such behavior.

Item Type: Article
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials > Nanocomposites
Nanoscale Objects and Nanostructured Materials > Nanoparticles > Nanospheres
Nanoscale Objects and Nanostructured Materials > Nanoparticles > Quantum confinement
Nanomanufacturing Characterization Techniques > Other Characterization Techniques > Laser induced fluorescence (LIF)
Collections: Nanomanufacturing Research Collection
Depositing User: Rebecca Reznik-Zellen
Date Deposited: 04 Mar 2009 17:20
Last Modified: 15 Sep 2011 16:44
URI: http://eprints.internano.org/id/eprint/54

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