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Silica-anchored cadmium sulfide nanocrystals for the optical detection of copper(II)

Authors
  • Xie, Tao1
  • Zhong, Xufeng2
  • Liu, Zhengjie1
  • Xie, Chenggen1, 2
  • 1 Anhui University, Hefei, Anhui, 230601, China , Hefei (China)
  • 2 West Anhui University, Lu’an, Anhui, 237012, China , Lu’an (China)
Type
Published Article
Journal
Microchimica Acta
Publisher
Springer-Verlag
Publication Date
May 12, 2020
Volume
187
Issue
6
Identifiers
DOI: 10.1007/s00604-020-04295-7
Source
Springer Nature
Keywords
License
Yellow

Abstract

A fluorometric assay was developed for the determination of copper(II) ion based on its quenching effect on the green fluorescent probe of SiO2-anchored CdS nanocrystals (SiO2/CdS NCs). The fluorescent probe was prepared by a surface ion-directing strategy for homogeneous precipitation of CdS NCs onto the carboxyl-capped SiO2 core surfaces. In comparison to CdS NCs, the SiO2/CdS NCs has strong fluorescence emission and good photostability. Moreover, SiO2/CdS NCs show higher fluorescence selectivity for copper(II) ions than for other common metal ions because copper(II) ions have a strong fluorescence quenching effect on SiO2/CdS NCs. At excitation/emission wavelengths of 300/516 nm, the resulting fluorescent probe shows wide linear ranges from 0.01 to 2 μM with a detection limit of 6.3 nM for copper(II) ions. The method has been applied to the determination of trace copper(II) ions in tea infusions with satisfactory results. Graphical abstract

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