Red-emitting Au-7 nanoclusters with fluorescence sensitivity to Fe2+ ions
Red-emitting Au-7 nanoclusters with fluorescence sensitivity to Fe2+ ions
复制标题
对 Fe2 离子具有荧光敏感性的发红光的 Au-7 纳米团簇
DOI：
10.1039/c7tc00724h
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发表时间：
2017
影响因子：
6.4
通讯作者：
Wei Shiqiang
中科院分区：
文献类型：
--
作者：
Yang Lina;Chen Juan;Huang Ting;Huang Li;Sun Zhihu;Jiang Yong;Yao Tao;Wei Shiqiang
发光金纳米团簇是近年来在光学传感和成像领域的一种重要材料。在这里，我们报告了一个红色发光的金纳米团簇与精确的分子式Au 7（DHLA）2Cl 2，通过使用二氢硫辛酸（DHLA）的双齿配体的尺寸聚焦策略合成。这种Au纳米团簇是水溶性的，在水中发射683 nm的荧光，量子产率为3.6%。Au 7（DHLA）2Cl 2的强荧光来源于Au（I）-DHLA/Cl基序在Au（0）核上以刚性核/壳结构聚集。此外，我们发现痕量的Fe ~（2+）离子可以选择性和灵敏地猝灭Au ~（7）（DHLA）_2Cl_2纳米团簇的荧光，使其成为一种潜在的Fe ~（2+）荧光传感器，检测限为3.8 μM（0.2 ppm）。解离诱导的荧光猝灭机制也被提出来描述的纳米团簇的荧光响应的Fe 2+离子。
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.