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.
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Funding
This work was supported by the Science and Technology Project of Anhui Province (Nos. 18030701164 and 1606c08229) and the National Undergraduate Training Program for Innovation and Entrepreneurship (No. 201910376005).
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Research highlights
• The silica-anchored cadmium sulfide nanocrystals (SiO2/CdS NCs) were fabricated by a surface ion–directing homogeneous precipitation strategy.
• The SiO2/CdS NCs exhibit strong fluorescence emission, good photostability, and high fluorescence selectivity for Cu2+.
• The SiO2/CdS NCs were successfully applied as selective fluorescent probes for the determination of Cu2+ in the infusion of tea.
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Xie, T., Zhong, X., Liu, Z. et al. Silica-anchored cadmium sulfide nanocrystals for the optical detection of copper(II). Microchim Acta 187, 323 (2020). https://doi.org/10.1007/s00604-020-04295-7
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DOI: https://doi.org/10.1007/s00604-020-04295-7