TY - JOUR
T1 - In-situ preparation of CdTe quantum dots capped with a β-cyclodextrin-epichlorohydrin polymer
T2 - Polymer influence on the nanocrystal’s optical properties
AU - Martin-Trasanco, Rudy
AU - Esparza-Ponce, Hilda E.
AU - Ortiz, Pedro D.
AU - Oyarzun, Diego P.
AU - Zuñiga, Cesar
AU - Montero-Cabrera, Maria E.
AU - Tundidor-Camba, Alain
AU - Pizarro, Guadalupe Del C.
AU - Arratia-Pérez, Ramiro
N1 - Funding Information:
This work was supported by the Fondo Nacional de Desarrollo Científico y Tecnológico [Grant FONDECYT-3150205]. The authors thank the support of Carlos Ornelas and from the Laboratorio Nacional de Nanotecnología (NANOTECH) at the Advanced Materials Research Center (CIMAV), in Chihuahua, Mexico. G. del C Pizarro acknowledges the financial assistance of VRAC, Grant Number L217-15 and L217-21 of the Universidad Tecnológica Metropolitana (UTEM).
Publisher Copyright:
© 2018 by the authors.
PY - 2018/11/9
Y1 - 2018/11/9
N2 - 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.
AB - 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.
KW - CdTe quantum dots
KW - Cyclodextrin-epichlorohydrin polymer
KW - Oswald ripening stage
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=85057402003&partnerID=8YFLogxK
U2 - 10.3390/nano8110948
DO - 10.3390/nano8110948
M3 - Article
AN - SCOPUS:85057402003
SN - 2079-4991
VL - 8
JO - Nanomaterials
JF - Nanomaterials
IS - 11
M1 - 948
ER -