LrgpV1, Hal, Corpus, bibRecord, 000425

Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling

Identifieur interne : 000425 ( Hal/Corpus ); précédent : 000424; suivant : 000426

Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling

Auteurs : Fadi Aldeek ; Christian Mustin ; Lavinia Balan ; Ghouti Medjahdi ; Thibault Rocques-Carmes ; Philippe Arnoux ; Raphaël Schneider

Source :

European Journal of Inorganic Chemistry [ 1434-1948 ] ; 2011-02.

RBID : Hal:hal-00798365

English descriptors

mix :
- CADMIUM SELENIDE NANOCRYSTALS, CDSE NANOCRYSTALS, Fluorescence, LIGHT-EMITTING-DIODES, NANOPARTICLES, PHOTOLUMINESCENCE, Quantum dots, SEMICONDUCTOR NANOCRYSTALS, SHELL NANOCRYSTALS, SIZE SERIES, SOLAR-CELLS, SURFACE-STATES, Synthesis design.

Abstract

We report on the preparation and on the photophysical and structural characterization of alloyed CdSe(S) nanocrystals, which are covered by a ZnO shell. CdSe(S) QDs were prepared by reaction of CdCl2 with NaHSe in the presence of 3-mercaptopropionic acid (MPA) under hydrothermal conditions. The incorporation of sulfur arises from the surface-mediated MPA hydrolysis on the growing QD surface. Water-dispersible CdSe(S) QDs were successfully capped with a ZnO shell obtained by basic hydrolysis of Zn(OAc)(2). The experimental results from transmission electron microscopy (TEM) imaging and powder X-ray diffractometry (XRD) analyses indicate that the core/shell CdSe(S)/ZnO QDs have a very small diameter (ca. 2.8 nm) and exhibit a face-centered cubic crystal structure. Our results show that core/shell CdSe(S)/ZnO QDs have a higher photostability than CdSe(S) cores. CdSe(S)/ZnO QDs have potential applications as fluorescent biological labels and were successfully used for imaging Schewanella oneidensis bacterial biofilms.

Url:

https://hal.archives-ouvertes.fr/hal-00798365

DOI: 10.1002/ejic.201000790

Links to Exploration step

Hal:hal-00798365

Le document en format XML

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<front><div type="abstract" xml:lang="en">We report on the preparation and on the photophysical and structural characterization of alloyed CdSe(S) nanocrystals, which are covered by a ZnO shell. CdSe(S) QDs were prepared by reaction of CdCl2 with NaHSe in the presence of 3-mercaptopropionic acid (MPA) under hydrothermal conditions. The incorporation of sulfur arises from the surface-mediated MPA hydrolysis on the growing QD surface. Water-dispersible CdSe(S) QDs were successfully capped with a ZnO shell obtained by basic hydrolysis of Zn(OAc)(2). The experimental results from transmission electron microscopy (TEM) imaging and powder X-ray diffractometry (XRD) analyses indicate that the core/shell CdSe(S)/ZnO QDs have a very small diameter (ca. 2.8 nm) and exhibit a face-centered cubic crystal structure. Our results show that core/shell CdSe(S)/ZnO QDs have a higher photostability than CdSe(S) cores. CdSe(S)/ZnO QDs have potential applications as fluorescent biological labels and were successfully used for imaging Schewanella oneidensis bacterial biofilms.</div>
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<abstract xml:lang="en">We report on the preparation and on the photophysical and structural characterization of alloyed CdSe(S) nanocrystals, which are covered by a ZnO shell. CdSe(S) QDs were prepared by reaction of CdCl2 with NaHSe in the presence of 3-mercaptopropionic acid (MPA) under hydrothermal conditions. The incorporation of sulfur arises from the surface-mediated MPA hydrolysis on the growing QD surface. Water-dispersible CdSe(S) QDs were successfully capped with a ZnO shell obtained by basic hydrolysis of Zn(OAc)(2). The experimental results from transmission electron microscopy (TEM) imaging and powder X-ray diffractometry (XRD) analyses indicate that the core/shell CdSe(S)/ZnO QDs have a very small diameter (ca. 2.8 nm) and exhibit a face-centered cubic crystal structure. Our results show that core/shell CdSe(S)/ZnO QDs have a higher photostability than CdSe(S) cores. CdSe(S)/ZnO QDs have potential applications as fluorescent biological labels and were successfully used for imaging Schewanella oneidensis bacterial biofilms.</abstract>
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Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling

Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling

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