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Issue 18, 2021
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Highly selective and rapid detection of silver ions by using a “turn on” non-fluorescent cysteine stabilized gold nanocluster probe

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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

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Supplementary files

Article information


Submitted
09 Feb 2021
Accepted
31 Mar 2021
First published
31 Mar 2021

Anal. Methods, 2021,13, 2099-2106
Article type
Paper

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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