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
|
PDF
EmrickBarnes-Nanotechnology-2007.pdf - Accepted Version Download (1MB) | Preview |
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 |
Actions (login required)
 |
View Item |
