Issue 64, 2020, Issue in Progress

Silver ion-doped CdTe quantum dots as fluorescent probe for Hg2+ detection

Abstract

Mercury(II), which is a well-known toxic species, exists in the industrial waste water in many cases. In the present work, CdTe quantum dots (QDs) are studied as a fluorescence probe for Hg2+ detection. Ag ions are induced to QDs to enlarge their detection concentration range. L-cysteine is employed in the QD-based fluorescence probe to connect QDs with Hg2+. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy results indicate the formation of zinc blende CdTe QDs with sizes of ∼5 nm and the existence of Ag+ in crystalline CdTe. Photoluminescence (PL) spectra and PL decay spectra were acquired to investigate the emission mechanism of Ag-doped CdTe QDs, revealing multi-emission in QD samples with higher concentrations of Ag+ doping. The highest PL quantum yield of the QD samples was 59.4%. Furthermore, the relationship between the fluorescence intensity and the concentration of Hg2+ has been established. Two linear relationships were obtained for the plot of F/F0 against Hg2+ concentration, enlarging the detection concentration range of Hg2+.

Graphical abstract: Silver ion-doped CdTe quantum dots as fluorescent probe for Hg2+ detection

Article information

Article type
Paper
Submitted
19 Aug 2020
Accepted
11 Oct 2020
First published
23 Oct 2020
This article is Open Access
Creative Commons BY license

RSC Adv., 2020,10, 38965-38973

Silver ion-doped CdTe quantum dots as fluorescent probe for Hg2+ detection

H. Li, W. Lu, G. Zhao, B. Song, J. Zhou, W. Dong and G. Han, RSC Adv., 2020, 10, 38965 DOI: 10.1039/D0RA07140D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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