Quinn, Steven D orcid.org/0000-0003-3442-4103 and Magennis, Steven W. (2017) Optical detection of gadolinium(iii) ions quantum dot aggregation. RSC Advances. pp. 24730-24735. ISSN 2046-2069
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Journal Article |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) The University of York > Faculty of Sciences (York) > Biology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 22 Jun 2018 11:10 |
Last Modified: | 24 Oct 2024 00:03 |
Published Version: | https://doi.org/10.1039/c7ra03969g |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1039/c7ra03969g |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132463 |