In-situ preparation of CdTe quantum dots capped with a β-cyclodextrin-epichlorohydrin polymer

Polymer influence on the nanocrystal’s optical properties

Rudy Martin-Trasanco, Hilda E. Esparza-Ponce, Pedro D. Ortiz, Diego P. Oyarzun, Cesar Zuñiga, Maria E. Montero-Cabrera, Alain Tundidor-Camba, Guadalupe Del C. Pizarro, Ramiro Arratia-Pérez

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number948
JournalNanomaterials
Volume8
Issue number11
DOIs
Publication statusPublished - 9 Nov 2018

Fingerprint

Cadmium telluride
Cytidine Diphosphate
Cyclodextrins
Nanocrystals
Semiconductor quantum dots
Polymers
Optical properties
Epichlorohydrin
Water
Scaffolds
Crosslinking
cyclodextrin-epichlorohydrin polymer
cadmium telluride
Energy dispersive spectroscopy
Solubility
Semiconductor materials
Transmission electron microscopy
Chemical analysis

Keywords

  • CdTe quantum dots
  • Cyclodextrin-epichlorohydrin polymer
  • Oswald ripening stage
  • Surface modification

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

Cite this

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. / In-situ preparation of CdTe quantum dots capped with a β-cyclodextrin-epichlorohydrin polymer : Polymer influence on the nanocrystal’s optical properties. In: Nanomaterials. 2018 ; Vol. 8, No. 11.
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abstract = "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.",
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author = "Rudy Martin-Trasanco and Esparza-Ponce, {Hilda E.} and Ortiz, {Pedro D.} and Oyarzun, {Diego P.} and Cesar Zu{\~n}iga and Montero-Cabrera, {Maria E.} and Alain Tundidor-Camba and Pizarro, {Guadalupe Del C.} and Ramiro Arratia-P{\'e}rez",
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day = "9",
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Martin-Trasanco, R, Esparza-Ponce, HE, Ortiz, PD, Oyarzun, DP, Zuñiga, C, Montero-Cabrera, ME, Tundidor-Camba, A, Pizarro, GDC & Arratia-Pérez, R 2018, 'In-situ preparation of CdTe quantum dots capped with a β-cyclodextrin-epichlorohydrin polymer: Polymer influence on the nanocrystal’s optical properties', Nanomaterials, vol. 8, no. 11, 948. https://doi.org/10.3390/nano8110948

In-situ preparation of CdTe quantum dots capped with a β-cyclodextrin-epichlorohydrin polymer : Polymer influence on the nanocrystal’s optical properties. / 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.

In: Nanomaterials, Vol. 8, No. 11, 948, 09.11.2018.

Research output: Contribution to journalArticle

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

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

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