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Red-emitting Au7 nanoclusters with fluorescence sensitivity to Fe2+ ions

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Abstract

Luminescent gold nanoclusters have recently emerged as an important class of sensing and imaging materials in optical applications. Here we report a red-emitting gold nanocluster with a precise molecular formula of Au7(DHLA)2Cl2, synthesized via the size-focusing strategy using a bidentate ligand of dihydrolipoic acid (DHLA). This Au nanocluster is water-soluble and emits fluorescence at 683 nm with a quantum yield of 3.6% in water. The intense fluorescence of Au7(DHLA)2Cl2 originates from the aggregation of Au(I)–DHLA/Cl motifs on the Au(0) core in a rigid core/shell-like structure. Moreover, we find that trace levels of Fe2+ ions can quench selectively and sensitively the fluorescence of the Au7(DHLA)2Cl2 nanocluster, making it a potential fluorescent sensor for Fe2+ with a limit of detection of 3.8 μM (0.2 ppm). A dissociation-induced fluorescence quenching mechanism is also proposed to describe the fluorescence response of the nanocluster to Fe2+ ions.

Graphical abstract: Red-emitting Au7 nanoclusters with fluorescence sensitivity to Fe2+ ions

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Publication details

The article was received on 16 Feb 2017, accepted on 02 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7TC00724H
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Red-emitting Au7 nanoclusters with fluorescence sensitivity to Fe2+ ions

    L. Yang, J. Chen, T. Huang, L. Huang, Z. Sun, Y. Jiang, T. Yao and S. Wei, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC00724H

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