Optical detection of gadolinium(III) ions via quantum dot aggregation

Quinn, S. D. and Magennis, S. W. (2017) Optical detection of gadolinium(III) ions via quantum dot aggregation. RSC Advances, 7(40), pp. 24730-24735. (doi: 10.1039/C7RA03969G) (PMID:29308186) (PMCID:PMC5735353)

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A rapid, sensitive and selective optical readout of the presence of gadolinium(III) ions would have a wide range of applications for clinical and environmental monitoring. We demonstrate that water-soluble CdTe quantum dots (QDs) are induced to aggregate by Gd3+ ions in aqueous solution. By using a combination of photoluminescence spectroscopy, dynamic light scattering and fluorescence correlation spectroscopy (FCS) to monitor quantum dot aggregation kinetics, we correlate the efficiency of the self-quenching process with the degree of aggregation across a broad range of conditions, including different sizes of QDs. We attribute the aggregation to metal binding to the QD's surface ligands and the quenching to intra-aggregate energy transfer between QDs. When the strategy was applied to additional trivalent ions, the aggregation rate varied according to the particular trivalent metal ion used, suggesting that the selectivity can be enhanced and controlled by appropriate design of the capping ligands and solution conditions.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Quinn, Dr Steven and Magennis, Dr Steven
Authors: Quinn, S. D., and Magennis, S. W.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:RSC Advances
Publisher:Royal Society of Chemistry
ISSN (Online):2046-2069
Published Online:11 May 2017
Copyright Holders:Copyright © 2017 The Royal Society of Chemistry
First Published:First published in RSC Advances 7(40:24730-24735
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
647971Speeding and stuttering: analysing the dynamics of DNA replication at the single molecule levelSteven MagennisBiotechnology and Biological Sciences Research Council (BBSRC)BB/K001957/1SCHOOL OF CHEMISTRY