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Urea-type ligand-modified CdSe quantum dots as a fluorescence "turn-on" sensor for CO3(2-) anions.

Authors
  • Han, Cuiping
  • Cui, Zhimin
  • Zou, Zhilong
  • Tian, Demei
  • Li, Haibing
Type
Published Article
Journal
Photochemical & Photobiological Sciences
Publisher
The Royal Society of Chemistry
Publication Date
Sep 24, 2010
Volume
9
Issue
9
Pages
1269–1273
Identifiers
DOI: 10.1039/c0pp00119h
PMID: 20714674
Source
Medline
License
Unknown

Abstract

A new fluorescence "turn-on" nanosensor for carbonate determination was reported based on CdSe quantum dots (QDs) modified with thio ligands containing urea groups: N-(5-mercapto-1,3,4-thiadiazol-2-ylcarbamoyl)-2-(o-tolyloxy)acetamide (AASH-CdSe QDs). The AASH-CdSe QDs were prepared through a ligand exchange process and characterized by transmission electron microscopy (TEM), fluorescence spectroscopy, UV-vis spectroscopy and FT-IR spectroscopy. The synthesized AASH-CdSe QDs allowed a selective fluorescence "turn-on" response towards carbonate. Under optimal conditions, the relative fluorescence intensity increases linearly with carbonate concentration in the range 1 x 10(-7)-1 x 10(-4) M with a detection limit of 2.3 x 10(-8) M. A Langmuir-type binding model was highly effective in describing the carbonate concentration dependence of the luminescence intensity of the AASH-CdSe QDs. The possible mechanism was discussed.

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