Issue 21, 2009
From the journal:

Physical Chemistry Chemical Physics

Photoenhancement of lifetimes in CdSe/ZnS and CdTe quantum dot-dopamine conjugates†

Daniel R. Cooper,a   Diana Suffern,b   Lina Carlini,a   Samuel J. Clarke,a   Rupesh Parbhoo,b   Stephen E. Bradforthb  and  Jay L. Nadeau*a  

* Corresponding authors

a Department of Biomedical Engineering, McGill University, 3775 Rue University, Montreal, Canada
E-mail: daniel.cooper@mail.mcgill.ca; jay.nadeau@mcgill.ca
Fax: +1 514 398 7461
Tel: +1 514 398 8372

b Department of Chemistry, University of Southern California, Los Angeles, USA

Abstract

The response of water-soluble, mercaptocarboxylic acid-capped fluorescent semiconductor nanoparticles, or quantum dots (QDs), to extended visible-light irradiation is variable and poorly described. Here we use time-resolved spectroscopy to investigate the photoluminescence intensities and lifetimes of CdSe/ZnS and CdTe QDs as a function of blue light illumination. Conjugates of the particles to the electron donor dopamine were also investigated, and the effect of the antioxidant beta-mercaptoethanol was explored. Both types of QD showed signs of direct electron transfer to the conjugate, but enhancement was much more pronounced in CdSe/ZnS. A model of the two different types of enhancement is proposed.

Graphical abstract: Photoenhancement of lifetimes in CdSe/ZnS and CdTe quantum dot-dopamine conjugates

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Article information

DOI
https://doi.org/10.1039/B820602C
Article type
Paper
Submitted
18 Nov 2008
Accepted
06 Mar 2009
First published
26 Mar 2009

Phys. Chem. Chem. Phys., 2009,11, 4298-4310

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Photoenhancement of lifetimes in CdSe/ZnS and CdTe quantum dot-dopamine conjugates

D. R. Cooper, D. Suffern, L. Carlini, S. J. Clarke, R. Parbhoo, S. E. Bradforth and J. L. Nadeau, Phys. Chem. Chem. Phys., 2009, 11, 4298 DOI: 10.1039/B820602C

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