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dc.contributor.authorGarcia Melchor, Maxen
dc.contributor.authorGounko, Iourien
dc.date.accessioned2020-10-05T11:28:28Z
dc.date.available2020-10-05T11:28:28Z
dc.date.issued2019en
dc.date.submitted2019en
dc.identifier.citationKuznetsova, V.; Mates-Torres, E.; Prochukhan, N.; Marcastel, M.; Purcell-Milton, F.;O Brien, J.; Visheratina, Anastasia; Martínez-Carmona, M.; Gromova, Y.; *García-Melchor, M.;Gun ko, Y., Effect of chiral ligand concentration and binding mode on chiroptical activity of CdSe/CdS quantum dots, ACS Nano, 13, 2019, 13560 - 13572en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/93679
dc.descriptionPUBLISHEDen
dc.description.abstractChiroptically active fluorescent semiconductor nanocrystals, quantum dots (QDs), are of high interest from a theoretical and technological point of view, because they are promising candidates for a range of potential applications. Optical activity can be induced in QDs by capping them with chiral molecules, resulting in circular dichroism (CD) signals in the range of the QD ultraviolet–visible (UV-vis) absorption. However, the effects of the chiral ligand concentration and binding modes on the chiroptical properties of QDs are still poorly understood. In the present study, we report the strong influence of the concentration of a chiral amino acid (cysteine) on its binding modes upon the surface of CdSe/CdS QDs, resulting in varying QD chiroptical activity and corresponding CD signals. Importantly, we demonstrate that the increase of cysteine concentration is accompanied by the growth of the QD CD intensity, reaching a certain critical point, after which it starts to decrease. The intensity of the CD signal varies by almost an order of magnitude across this range. Nuclear magnetic resonance and Fourier transform infrared data, supported by density functional theory calculations, reveal a change in the binding mode of cysteine molecules from tridentate to bidentate when going from low to high concentrations, which results in a change in the CD intensity. Hence, we conclude that the chiroptical properties of QDs are dependent on the concentration and binding modes of the capping chiral ligands. These findings are very important for understanding chiroptical phenomena at the nanoscale and for the design of advanced optically active nanomaterials.en
dc.format.extent13560en
dc.format.extent13572en
dc.language.isoenen
dc.relation.ispartofseriesACS Nanoen
dc.relation.ispartofseries13en
dc.rightsYen
dc.subjectChiralityen
dc.subjectQuantum dotsen
dc.subjectChiroptical activityen
dc.subjectCysteineen
dc.subjectLigand concentrationen
dc.subjectBinding modeen
dc.subjectDensity functional theoryen
dc.titleEffect of chiral ligand concentration and binding mode on chiroptical activity of CdSe/CdS quantum dotsen
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/garciammen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/igounkoen
dc.identifier.rssinternalid212931en
dc.identifier.doihttps://doi.org/10.1021/acsnano.9b07513en
dc.rights.ecaccessrightsopenAccess
dc.contributor.sponsorGrantNumberSFI 16/RC/3889en
dc.subject.TCDThemeNanoscience & Materialsen
dc.identifier.orcid_id0000-0003-1348-4692en
dc.status.accessibleNen


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