DOPA-Mediated Reduction Allows the Facile Synthesis of Fluorescent Gold Nanoclusters for Use as Sensing Probes for Ferric Ions

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• 作者：Ja-an Annie Ho ; Heng-Chia Chang ; Wen-Ta Su
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：April 3, 2012
• 年：2012
• 卷：84
• 期：7
• 页码：3246-3253
• 全文大小：456K
• 年卷期：v.84,no.7(April 3, 2012)
• ISSN：1520-6882

文摘

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 (Fe³⁺). 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 渭M for the determination of Fe³⁺ ions, which is lower than the maximum level (0.3 mg L^鈥?, equivalent to 5.4 渭M) of Fe³⁺ permitted in drinking water by the U.S. Environmental Protection Agency.