High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage2328en_US
dc.citation.issueNumber7en_US
dc.citation.spage2317en_US
dc.citation.volumeNumber8en_US
dc.contributor.authorZare, H.en_US
dc.contributor.authorMarandi, M.en_US
dc.contributor.authorFardindoost, S.en_US
dc.contributor.authorSharma, V.K.en_US
dc.contributor.authorYeltik A.en_US
dc.contributor.authorAkhavan, O.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.authorTaghavinia, N.en_US
dc.date.accessioned2016-02-08T09:46:37Z
dc.date.available2016-02-08T09:46:37Z
dc.date.issued2015en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe report high-efficiency CdTe/CdS core/shell nanocrystals synthesized in water by epitaxially growing CdS shells on aqueous CdTe cores at room temperature, enabled by the controlled release of S species under low-intensity ultraviolet (UV) light illumination. The resulting photo-induced dissociation of S<inf>2</inf>O<inf>3</inf>2− ions conveniently triggers the formation of critical two-dimensional CdS epitaxy on the CdTe surface at room temperature, as opposed to initiating the growth of individual CdS core-only nanocrystals. This controlled colloidal hetero-epitaxy leads to a substantial increase in the photoluminescence (PL) quantum yield (QY) of the shelled nanocrystals in water (reaching 64%). With a systematic set of studies, the maximum PL QY is found to be almost independent of the illuminating UV intensity, while the shell formation kinetics required for reaching the maximum QY linearly depends on the illuminating UV intensity. A stability study of the QD films in air at various temperatures shows highly improved thermal stability of the shelled QDs (up to 120 °C in ambient air). These results indicate that the proposed aqueous CdTe/CdS core/shell nanocrystals hold great promise for applications requiring efficiency and stability. [Figure not available: see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.en_US
dc.identifier.doi10.1007/s12274-015-0742-xen_US
dc.identifier.issn1998-0124
dc.identifier.urihttp://hdl.handle.net/11693/21458
dc.language.isoEnglishen_US
dc.publisherTsinghua University Pressen_US
dc.relation.isversionofhttp://dx.doi.org/10.1007/s12274-015-0742-xen_US
dc.source.titleNano Researchen_US
dc.subjectCdTe/CdSen_US
dc.subjectCore/shellen_US
dc.subjectNanocrystalen_US
dc.subjectPhotochemicalen_US
dc.subjectThermal stabilityen_US
dc.titleHigh-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperatureen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
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