Germanium nanocrystals as luminescent probes for rapid, sensitive and label-free detection of Fe3+ ions

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Show simple item record Carolan, Darragh Doyle, Hugh 2016-05-05T10:23:54Z 2016-05-05T10:23:54Z 2015-02-24
dc.identifier.citation CAROLAN, D. & DOYLE, H. 2015. Germanium nanocrystals as luminescent probes for rapid, sensitive and label-free detection of Fe3+ ions. Nanoscale, 7, pp. 5488-5494. doi: 10.1039/C4NR07470J en
dc.identifier.volume 7 en
dc.identifier.startpage 5488 en
dc.identifier.endpage 5494 en
dc.identifier.issn 2040-3364
dc.identifier.doi 10.1039/C4NR07470J
dc.description.abstract Luminescent water-soluble germanium nanocrystals (Ge NCs) have been developed as a fluorescent sensing platform for the highly selective and sensitive detection of Fe3+ via quenching of their strong blue luminescence, without the need for analyte-specific labelling groups. The amine-terminated Ge NCs were separated into two discrete size fractions with average diameters of 3.9 +/- 0.4 nm and 6.8 +/- 1.8 nm using centrifugation. The smaller 3.9 nm NCs possessed a strong blue luminescence, with an average lifetime of 6.1 ns and a quantum yield (QY) of 21.5%, which is strongly influenced by solution pH. In contrast, 6.8 nm NCs exhibited a green luminescence with a longer lifetime of 7.8 ns and lower QY (6.2%) that is insensitive to pH. Sensitive detection of Fe3+ was successfully demonstrated, with a linear relationship between luminescence quenching and Fe3+ concentration observed from 0-800 mu M, with a limit of detection of 0.83 mu M. The Ge NCs show excellent selectivity toward Fe3+ ions, with no quenching of the fluorescence signal induced by the presence of Fe2+ ions, allowing for solution phase discrimination between ions of the same element with different formal charges. The luminescence quenching mechanism was confirmed by static and time-resolved photoluminescence spectroscopies, while the applicability for this assay for detection of Fe3+ in real water samples was successfully demonstrated. en
dc.description.sponsorship European Commission (FP7 Projects: HYSENS, grant agreement no 263091; COMMONSENSE, grant agreement no 261809; SNAPSUN, grant agreement no 246310); Higher Education Authority (PRTLI programs: Cycle 3 “Nanoscience” and Cycle 4 “INSPIRE”) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher The Royal Society of Chemistry en
dc.rights © 2015, the Authors. en
dc.subject Fluorescent sensing platform en
dc.subject Nanocrystals en
dc.subject Highly luminescent en
dc.subject Metal ions en
dc.subject Germanium en
dc.subject Sensitive detection en
dc.title Germanium nanocrystals as luminescent probes for rapid, sensitive and label-free detection of Fe3+ ions en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Hugh Doyle, Micro-Nanoelectronics Centre, Tyndall National Institute, Cork, Ireland. +353-21-490-4310 Email: en
dc.internal.availability Full text available en 2016-04-10T17:45:09Z
dc.description.version Accepted Version en
dc.internal.rssid 322050583
dc.internal.wokid 000351372400046
dc.contributor.funder Higher Education Authority en
dc.contributor.funder European Commission
dc.description.status Peer reviewed en
dc.identifier.journaltitle Nanoscale en
dc.internal.copyrightchecked Yes. !!CORA!! AV permitted by the publisher: "Accepted manuscripts may be distributed via repositories after an embargo period of 12 months". Must include link to version of record. en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress en

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