DOPA-Mediated Reduction Allows the Facile Synthesis of Fluorescent Gold Nanoclusters for Use as Sensing Probes for Ferric Ions
Resource
ANALYTICAL CHEMISTRY, 84(7), 3246-3253
Journal
Analytical Chemistry
Journal Volume
84
Journal Issue
7
Pages
3246-3253
ISSN
0003-2700
Date Issued
2012-02-27
Date
2012
Author(s)
Abstract
In this paper, we describe a simple one-pot method, employing l-3,4-dihydroxyphenylalanine (l-DOPA) as a reducing/capping reagent, for the synthesis of fluorescent gold nanoclusters (AuNCs). Within a short reaction time of 15 min (excluding the time required for purification), this strategy allows the fabrication of homogeneous AuNCs having the capability to sense ferric ions (Fe 3+). The as-prepared AuNCs exhibited a fluorescence emission at 525 nm and a quantum yield of 1.7%. On the basis of an aggregation-induced fluorescence quenching mechanism, these fluorescent AuNCs offer acceptable sensitivity, high selectivity, and a limit of detection of 3.5 μM for the determination of Fe 3+ ions, which is lower than the maximum level (0.3 mg L -1, equivalent to 5.4 μM) of Fe 3+ permitted in drinking water by the U.S. Environmental Protection Agency.
Publisher
American Chemical Society
Type
journal article
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