Issue 14, 2012

Au25(SG)18 as a fluorescent iodide sensor

Abstract

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 Au25(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 Au25(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.

Graphical abstract: Au25(SG)18 as a fluorescent iodide sensor

Supplementary files

Article information

Article type
Communication
Submitted
20 Jan 2012
Accepted
30 Mar 2012
First published
23 Apr 2012

Nanoscale, 2012,4, 4087-4090

Au25(SG)18 as a fluorescent iodide sensor

M. Wang, Z. Wu, J. Yang, G. Wang, H. Wang and W. Cai, Nanoscale, 2012, 4, 4087 DOI: 10.1039/C2NR30169E

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