Sensitive surface states and their passivation mechanism in CdS quantum dots

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buir.contributor.authorUyar, Tamer
buir.contributor.orcidUyar, Tamer|0000-0002-3989-4481
dc.citation.epage21618en_US
dc.citation.issueNumber41en_US
dc.citation.spage21609en_US
dc.citation.volumeNumber117en_US
dc.contributor.authorVempati S.en_US
dc.contributor.authorErtas, Y.en_US
dc.contributor.authorUyar, Tameren_US
dc.date.accessioned2016-02-08T09:34:37Z
dc.date.available2016-02-08T09:34:37Z
dc.date.issued2013en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractWe report on phase sensitive surface states of CdS quantum dots (QDs), where it is noticed that a simple phase change from dispersion to solid has shown significant influence on the emission spectrum. As the solvent evaporates from the dispersion, apparently yellow dispersion transforms into a white light emitter because of the conformal changes in the polymer that surrounds the QDs. In turn, these changes catalyze the emission from three specific wavelengths in the blue region of the spectrum, shifting the surface defects closer to the conduction band of CdS. In the phase change from dispersion to solid, flexible and dangling polymer chains are transformed into rigid moieties that can be treated as a modified chemical environment. Furthermore, to ascertain the origin of the new emission lines, we have studied a dipole interaction-based passivation mechanism between QDs and the polymer. The proposed mechanism may be valuable for designing future QD-based fluorophores and explains the sensitivity of the surface states in the case of CdS. © 2013 American Chemical Society.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T09:34:37Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2013en
dc.identifier.doi10.1021/jp408160hen_US
dc.identifier.eissn1932-7455
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/20756
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jp408160hen_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.titleSensitive surface states and their passivation mechanism in CdS quantum dotsen_US
dc.typeArticleen_US

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Institute of Materials Science and Nanotechnology (UNAM)
Nanotechnology Research Center (NANOTAM)