Journal
ANALYTICA CHIMICA ACTA
Volume 895, Issue -, Pages 95-103Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2015.09.002
Keywords
Copper nanoclusters; Ratiometric fluorescence; Visualization; Polyethyleneimin
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Funding
- National Natural Science Foundation of China [21163014, 21475056]
- Program for New Century Excellent Talents in University [NCET-11-1002, NCET-13-0848]
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Copper is a highly toxic environmental pollutant with bioaccumulative properties. Therefore, sensitive detection of Cu2+ is very important to prevent over-ingestion, and visual detection is preferred for practical applications. In this work, we developed a simple and environmental friendly approach to synthesize hyperbranched polyethyleneimine-protected copper nanoclusters (hPEI-Cu NCs) with great stability against extreme pH, high ionic strength, thiols etching and light illumination, which were then conjugated to the surface of silica coated CdSe quantum dots (QDs) to design a ratiometric fluorescence probe. In the presence of different amounts of Cu2+ ions, the fluorescence of Cu NCs can be drastically quenched, while the emission from QDs stayed constant to serve as a reference signal and the color of the probe changed from yellow-green to red, resulting in ratiometric and visualization detection of Cu2+ ion with high accuracy. The detection limit for Cu2+ was estimated to be 8.9 nM, much lower than the allowable level of Cu2+ in drinking water (similar to 20 mu M) set by U.S. Environmental Protection Agency. Additionally, this probe can be also applied for the determination of Cu2+ ion in complex real water samples. (C) 2015 Elsevier B.V. All rights reserved.
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