Journal
MICROCHIMICA ACTA
Volume 182, Issue 7-8, Pages 1371-1377Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-015-1458-z
Keywords
Copper nanoclusters; Cysteine; Quenching; Chromium(VI); Fluorescence; Nanomaterial
Categories
Funding
- National Natural Science Foundation of China [21175060]
- Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, China [JDSJ2013-02]
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A facile, one-pot green method is presented for the preparation of water-soluble luminescent copper nanoclusters (Cu-NCs) from copper dichloride and cysteine as the precursor and stabilizer, respectively. The Cu-NCs are characterized by high resolution transmission electron microscopy, X-ray photoelectron spectroscopy, fluorescence, UV-Vis, and Raman spectroscopy. The Cu-NCs have an average size of 3.5 nm and are stable in aqueous solution at least for 2 weeks. Under photo excitation with 365 nm light, the Cu-NCs display strong green fluorescence with the maximum of emission at 490 nm and a quantum yield of 5.6 %. Fluorescence is quenched by Cr(VI) ion, and this effect was exploited to develop a highly selective method for the determination of Cr(VI). The detection limit of this probe is as low as 43 nM.
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