Issue 18, 2021

Highly selective and rapid detection of silver ions by using a “turn on” non-fluorescent cysteine stabilized gold nanocluster probe

Abstract

Cysteine is widely used as a stabilizer for the preparation of fluorescent gold nanoclusters (Au NCs) with different fluorescence properties. Herein, by using cysteine as a stabilizer and controlling the synthesis conditions, a new non-fluorescent cysteine stabilized gold nanocluster (Cys-Au NCs) probe was prepared and a new strategy for “turning on” the fluorescence of the Cys-Au NCs was studied for rapid and selective detection of silver ions. In this strategy, the addition of silver ions to non-fluorescent Cys-Au NCs solution could quickly induce a visible fluorescence “turn on” phenomenon in 30 s. Further studies indicated that this fluorescence “turn on” phenomenon is specific for silver ions and the “turn on” fluorescence intensity has a linear relationship with the amount of silver ions in the range from 3.0 to 30.0 μM. Therefore, the non-fluorescent Cys-Au NCs were applied to the detection of silver ions in environmental water samples and a limit of detection (LOD) of 0.26 μM was obtained. This research sheds light on new applications of Au NCs and proposes a simple, rapid, sensitive, and visual method for the detection of metal ions.

Graphical abstract: Highly selective and rapid detection of silver ions by using a “turn on” non-fluorescent cysteine stabilized gold nanocluster probe

Supplementary files

Article information

Article type
Paper
Submitted
27 جمادى الثانية 1442
Accepted
18 شعبان 1442
First published
18 شعبان 1442

Anal. Methods, 2021,13, 2099-2106

Highly selective and rapid detection of silver ions by using a “turn on” non-fluorescent cysteine stabilized gold nanocluster probe

J. Wang, A. Liu, B. Wu, Q. Wen, Z. Pu, R. Zhao, J. Ling and Q. Cao, Anal. Methods, 2021, 13, 2099 DOI: 10.1039/D1AY00241D

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