Near-infrared fluorescence probes for the selective and sensitive detection of sulfur ions based on glutathione capped gold nanoclusters†

IF 2.7 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

New Journal of Chemistry Pub Date : 2024-10-28 DOI:10.1039/D4NJ04452E

Jia Shi, Zhuorong Fan, Rongrong Zhang, Ziyu Feng, Xiaojuan Gong, Shengmei Song and Wenjuan Dong

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Abstract

The excellent anti-interference ability of near-infrared (NIR) fluorescent materials derived from long-wavelength emission has made them one of the most fascinating fluorescence probes. In this work, gold nanoclusters stabilized with glutathione (GSH-AuNCs) were prepared and exhibited excellent NIR fluorescence at 806 nm, indicating their potential as excellent fluorescence probes. It is gratifying that S²⁻ could be sensitively and rapidly recognized through the “turn-off” strategy of NIR fluorescence of AuNCs. It is speculated that the quenching was due to the aggregation-caused quenching (ACQ) phenomenon. The combination of a longer wavelength emission of 806 nm and the strong binding ability of Au and S endowed the constructed sensing system with outstanding sensitivity and selectivity. A good linear relationship for the detection of S²⁻ was obtained in the range of 0–23.75 μM, with a limit of detection (LOD) of 14.67 nM (S/N = 3). This NIR fluorescence probe was successfully used for the detection of S²⁻ in real samples with satisfactory results.

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基于谷胱甘肽封端的金纳米簇的近红外荧光探针，用于选择性灵敏检测硫离子†

源自长波发射的近红外（NIR）荧光材料具有卓越的抗干扰能力，使其成为最迷人的荧光探针之一。在这项工作中，制备了谷胱甘肽稳定的金纳米团簇（GSH-AuNCs），并在 806 纳米波长处显示出优异的近红外荧光，表明它们具有作为优异荧光探针的潜力。令人欣慰的是，通过 AuNCs 近红外荧光的 "关闭 "策略，S2- 可以被灵敏而快速地识别。据推测，这种淬灭是由聚集引起的淬灭（ACQ）现象造成的。806 纳米的长波长发射与 Au 和 S 的强结合能力相结合，使所构建的传感系统具有出色的灵敏度和选择性。在 0-23.75 μM 范围内，S2- 的检测具有良好的线性关系，检测限（LOD）为 14.67 nM（S/N = 3）。该近红外荧光探针被成功用于实际样品中 S2- 的检测，结果令人满意。

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