Journal
ANALYST
Volume 139, Issue 13, Pages 3441-3445Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4an00505h
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Funding
- National Natural Science Foundation of China (NSFC) [21035005]
- Ministry of Science and Technology of the People's Republic of China [2011CB933600]
- Cultivation Plan of Chongqing Science & Technology Commission for 100 Outstanding Science and Technology Leading Talents
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Water-soluble fluorescent silver nanoclusters (AgNCs) with almost seven and nine silver atoms and a quantum yield (QY) of 5.38 +/- 0.25% were successfully prepared via one-pot hydrothermal synthesis using polymethacrylic acid sodium salt (PMAA-Na) as a template. The as-prepared PMAA-AgNCs displayed a mono-distribution, they were uniform in size and the color of the fluorescence, emitting at 579 nm, was orange when excited at 502 nm. What is more, we found that the as-prepared PMAA-AgNCs could be quenched by sulfides based on the formation of a metal-ligand bond Ag-S, and thus sulfides could be sensitively detected by spectrofluorometry. As proof of concept, thiourea (TU) and other sulfides including cysteine (Cys), glutathione (GSH) and DL-methionine could be detected. For example, the color of the orange fluorescent AgNCs solutions darkened upon the addition of TU and the fluorescence of PMAA-AgNCs was quenched. The detection limit for TU was 6.10 mu M in the linear range from 8.57 mu M to 2.29 mM.
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