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    Phys Chem Chem Phys. 2009 Jun 7;11(21):4298-310. Epub 2009 Mar 26.

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

    Cooper DR, Suffern D, Carlini L, Clarke SJ, Parbhoo R, Bradforth SE, Nadeau JL.

    Source

    Department of Biomedical Engineering, McGill University, 3775 Rue University, Montreal, QC H3A 2B4, Canada. daniel.cooper@mail.mcgill.ca

    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.

    PMID:
    19458832
    [PubMed - indexed for MEDLINE]

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