In-Situ Preparation of CdTe Quantum Dots Capped with a β-Cyclodextrin-Epichlorohydrin Polymer: Polymer Influence on the Nanocrystal's Optical Properties

β-Cyclodextrin (βCD), the less water soluble of the cyclodextrins, has been used as a capping agent in the preparation of semiconductor nanocrystals or quantum dots (QDs). Nevertheless, no reports have been found in the use of the highly water-soluble polymer of this, prepared by the crosslinking of...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2018-11, Vol.8 (11), p.948
Main Authors: Martin-Trasanco, Rudy, Esparza-Ponce, Hilda E, Ortiz, Pedro D, Oyarzun, Diego P, Zuñiga, Cesar, Montero-Cabrera, Maria E, Tundidor-Camba, Alain, Pizarro, Guadalupe Del C, Arratia-Pérez, Ramiro
Format: Article
Language:English
Subjects:
Cadmium
Cadmium telluride
Cadmium tellurides
Capping
CdTe quantum dots
Crosslinking
Crystals
cyclodextrin-epichlorohydrin polymer
Cyclodextrins
Energy dispersive X ray spectroscopy
Energy transmission
Epichlorohydrin
Ligands
Micrography
Nanocrystals
Nanoparticles
Optical properties
oswald ripening stage
Photoluminescence
Photomicrographs
Polymers
Quantum dots
Ripening
Size distribution
surface modification
Transmission electron microscopy
Water chemistry
Water soluble polymers
X-ray spectroscopy
β-Cyclodextrin
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Summary:β-Cyclodextrin (βCD), the less water soluble of the cyclodextrins, has been used as a capping agent in the preparation of semiconductor nanocrystals or quantum dots (QDs). Nevertheless, no reports have been found in the use of the highly water-soluble polymer of this, prepared by the crosslinking of the βCD units with epichlorohydrin in basic medium (βCDP). This polymer, besides to overcome the low solubility of the βCD, increases the inclusion constant of the guest; two parameters that deserve its use as capping agent, instead of the native cyclodextrin. In the present manuscript, we afforded the in-situ aqueous preparation of cadmium telluride (CdTe) QDs capped with βCDP. The polymer influence on the photoluminescent properties of the nanocrystals was analyzed. The βCDP controls the nanocrystals growth during the Oswald ripening stage. Consequently, the CdTe capped βCDP QDs showed lower Stokes-shift values, higher photoluminescent efficiency, and narrower size distribution than for nanocrystals obtained in the absence of polymer. Transmission electron microscopy (TEM) micrographs and energy dispersive X-ray spectroscopy (EDS) analysis revealed the composition and crystallinity of the CdTe QDs. This βCDP capped CdTe QDs is a potential scaffold for the supramolecular modification of QDs surface.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano8110948