期刊
NANOSCALE
卷 4, 期 14, 页码 4087-4090出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr30169e
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资金
- Chinese Academy of Sciences
- National Basic Research Program of China [2007CB936604]
- Natural Science Foundation of China [21171170]
The recently emerging gold nanoclusters (GNC) are of major importance for both basic science studies and practical applications. Based on its surface-induced fluorescence properties, we investigated the potential use of Au-25(SG)(18) (GSH: glutathione) as a fluorescent iodide sensor. The current detection limit of 400 nM, which can possibly be further enhanced by optimizing the conditions, and excellent selectivity among 12 types of anion (F-, Cl-, Br-, I-, NO3-, ClO4-, HCO3-, IO3-, SO42-, SO32-, CH3COO- and C6H5O73-) make Au-25(SG)(18) a good candidate for iodide sensing. Furthermore, our work has revealed the particular sensing mechanism, which was found to be affinity-induced ratiometric and enhanced fluorescence (abbreviated to AIREF), which has rarely been reported previously and may provide an alternative strategy for devising nanoparticle-based sensors.
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