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Photostability of the Oleic Acid-Encapsulated Water-Soluble CdxSeyZn1-xS1-y Gradient Core-Shell Quantum Dots

Chen, Junsheng LU ; Yang, B; Li, Chuanshuai LU ; Zheng, Kaibo LU ; Zidek, Karel LU and Pullerits, Tonu LU (2017) In ACS Omega 2(5). p.1922-1929
Abstract

Composite systems where quantum dots (QDs) are combined with other nanomaterials (e.g., gold nanorods) in aqueous solutions have attracted broad attention - both for their potential in applications and for studies of fundamental processes. However, high-quality QDs are typically prepared in organic solvents, and the transfer of QDs to an aqueous phase is needed to create the desired QD composites. Photostability of the transferred QDs - both the steady-state and photo-induced dynamic properties - is essential for studying the processes in the composites and for their applications. We present a detailed study of the photostability of aqueous CdxSeyZn1-xS1-y gradient core-shell QDs obtained by... (More)

Composite systems where quantum dots (QDs) are combined with other nanomaterials (e.g., gold nanorods) in aqueous solutions have attracted broad attention - both for their potential in applications and for studies of fundamental processes. However, high-quality QDs are typically prepared in organic solvents, and the transfer of QDs to an aqueous phase is needed to create the desired QD composites. Photostability of the transferred QDs - both the steady-state and photo-induced dynamic properties - is essential for studying the processes in the composites and for their applications. We present a detailed study of the photostability of aqueous CdxSeyZn1-xS1-y gradient core-shell QDs obtained by various approaches using linker exchange and surfactant encapsulation. Beside the steady-state photoluminescence (PL) emission stability, we also study changes in the PL decay. From the variety of the studied samples, the water-soluble QDs encapsulated by a double layer of oleic acid show superior properties, that is, stable PL emission and PL decay under continuous light or pulsed-laser light irradiation. We demonstrate that the double-layer encapsulation of QDs can be used to create QDs-metal nanoparticle composites.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Omega
volume
2
issue
5
pages
8 pages
publisher
American Chemical Society (ACS)
external identifiers
  • scopus:85028960419
  • wos:000404727800021
ISSN
2470-1343
DOI
10.1021/acsomega.7b00316
language
English
LU publication?
yes
id
35048eef-de42-4237-a818-d8997e36962a
date added to LUP
2017-09-27 13:08:46
date last changed
2018-01-16 13:27:13
@article{35048eef-de42-4237-a818-d8997e36962a,
  abstract     = {<p>Composite systems where quantum dots (QDs) are combined with other nanomaterials (e.g., gold nanorods) in aqueous solutions have attracted broad attention - both for their potential in applications and for studies of fundamental processes. However, high-quality QDs are typically prepared in organic solvents, and the transfer of QDs to an aqueous phase is needed to create the desired QD composites. Photostability of the transferred QDs - both the steady-state and photo-induced dynamic properties - is essential for studying the processes in the composites and for their applications. We present a detailed study of the photostability of aqueous Cd<sub>x</sub>Se<sub>y</sub>Zn<sub>1-x</sub>S<sub>1-y</sub> gradient core-shell QDs obtained by various approaches using linker exchange and surfactant encapsulation. Beside the steady-state photoluminescence (PL) emission stability, we also study changes in the PL decay. From the variety of the studied samples, the water-soluble QDs encapsulated by a double layer of oleic acid show superior properties, that is, stable PL emission and PL decay under continuous light or pulsed-laser light irradiation. We demonstrate that the double-layer encapsulation of QDs can be used to create QDs-metal nanoparticle composites.</p>},
  author       = {Chen, Junsheng and Yang, B and Li, Chuanshuai and Zheng, Kaibo and Zidek, Karel and Pullerits, Tonu},
  issn         = {2470-1343},
  language     = {eng},
  month        = {05},
  number       = {5},
  pages        = {1922--1929},
  publisher    = {American Chemical Society (ACS)},
  series       = {ACS Omega},
  title        = {Photostability of the Oleic Acid-Encapsulated Water-Soluble Cd<sub>x</sub>Se<sub>y</sub>Zn<sub>1-x</sub>S<sub>1-y</sub> Gradient Core-Shell Quantum Dots},
  url          = {http://dx.doi.org/10.1021/acsomega.7b00316},
  volume       = {2},
  year         = {2017},
}