Time-dependent growth of silica shells on CdTe quantum dots

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dc.contributor.authorModlitbová, Pavlínacs
dc.contributor.authorKlepárník, Karelcs
dc.contributor.authorFarka, Zdeněkcs
dc.contributor.authorPořízka, Pavelcs
dc.contributor.authorSkládal, Petrcs
dc.contributor.authorNovotný, Karelcs
dc.contributor.authorKaiser, Jozefcs
dc.coverage.issue6cs
dc.coverage.volume8cs
dc.date.issued2018-06-16cs
dc.description.abstractThe purpose of this study is to investigate the time dependent growth of silica shell on CdTe quantum dots to get its optimum thickness for applications in practice. The core/shell structured silica-coated CdTe quantum dots (CdTe/SiO2 QDs) were synthesized by Ströber process which used CdTe QDs co-stabilized by mercaptopropionic acid. The coating procedure used silane primer (3-mercaptopropyltrimethoxysilane) in order to make the QDs surface vitreophilic. The total size of QDs was dependent on the time of silica shell growth in the presence of sodium silicate likewise on the presence of ethanol during this growth. The size of particles was monitored during the first 72 hours using two principally different methods: Dynamic Light Scattering (DLS), and Scanning Electron Microscopy (SEM). The data obtained by both methods were compared and reasons of differences discussed. Without ethanol precipitation, the silica shell thickness grew slowly and increased the nanoparticle total size from approximately 23 nm up to almost 30 nm (DLS data) and up to almost 60 nm (SEM data) in three days. During the same time period but in ethanol presence, the size of CdTe/SiO2 QDs increased more significantly up to 115 nm (DLS data) and up to 83 nm (SEM data). The variances occurring between silica shell thickness caused by different ways of silica growth as well as by different evaluation methods were discussed.en
dc.formattextcs
dc.format.extent1-9cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationNanomaterials. 2018, vol. 8, issue 6, p. 1-9.en
dc.identifier.doi10.3390/nano8060439cs
dc.identifier.issn2079-4991cs
dc.identifier.orcid0000-0003-4970-356Xcs
dc.identifier.orcid0000-0002-8604-7365cs
dc.identifier.orcid0000-0002-7397-125Xcs
dc.identifier.other148468cs
dc.identifier.researcheridH-8100-2017cs
dc.identifier.researcheridG-9463-2014cs
dc.identifier.researcheridD-6800-2012cs
dc.identifier.scopus55312098800cs
dc.identifier.scopus7402184758cs
dc.identifier.urihttp://hdl.handle.net/11012/83849
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofNanomaterialscs
dc.relation.urihttp://www.mdpi.com/2079-4991/8/6/439cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2079-4991/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectquantum dotsen
dc.subjectnanoparticlesen
dc.subjectphotoluminescence spectraen
dc.subjectdynamic light scatteringen
dc.subjectscanning electron microscopyen
dc.titleTime-dependent growth of silica shells on CdTe quantum dotsen
dc.type.driverarticleen
dc.type.versionpublishedVersionen
sync.item.dbidVAV-148468en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 16:10:51en
sync.item.modts2025.01.17 15:27:47en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Pokročilé instrumentace a metody pro charakterizace materiálůcs
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