Synthesis and optical properties of thiol functionalized CdSe/ZnS (Core/Shell) quantum dots by ligand exchange

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DOIResolve DOI: http://doi.org/10.1155/2014/324972
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TypeArticle
Journal titleJournal of Nanomaterials
ISSN1687-4129
Volume2014
Article number324972
SubjectEmission spectroscopy; Ligands; Molecules; Semiconductor quantum dots; 1 ,4-Benzenedimethanethiol; Ligand concentration; Photoluminescent efficiencies; Photoluminescent emission; Surface passivation; Surface passivation effects; Thiol-functionalization; Trioctylphosphine oxide; Optical properties
AbstractThe colloidal photoluminescent quantum dots (QDs) of CdSe (core) and CdSe/ZnS (core/shell) were synthesized at different temperatures with different growth periods. Optical properties (i.e., UV/Vis spectra and photoluminescent emission spectra) of the resulting QDs were investigated. The shell-protected CdSe/ZnS QDs exhibited higher photoluminescent (PL) efficiency and stability than their corresponding CdSe core QDs. Ligand exchange with various thiol molecules was performed to replace the initial surface passivation ligands, that is, trioctylphosphine oxide (TOPO) and trioctylphosphine (TOP), and the optical properties of the surface-modified QDs were studied. The thiol ligand molecules in this study included 1,4-benzenedimethanethiol, 1,16-hexadecanedithiol, 1,11-undecanedithiol, biphenyl-4,4′-dithiol, 11-mercapto-1-undecanol, and 1,8-octanedithiol. After the thiol functionalization, the CdSe/ZnS QDs exhibited significantly enhanced PL efficiency and storage stability. Besides surface passivation effect, such enhanced performance of thiol-functionalized QDs could be due to cross-linked assembly formation of dimer/trimer clusters, in which QDs are linked by dithiol molecules. Furthermore, effects of ligand concentration, type of ligand, and heating on the thiol stabilization of QDs were also discussed. © 2014 Huaping Zhu et al.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Steacie Institute for Molecular Sciences (SIMS-ISSM)
Peer reviewedYes
NPARC number21272231
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Record identifiere643c4ad-f9a4-4f11-9806-410b559365cd
Record created2014-07-23
Record modified2016-05-09
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