College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, People's Republic of China.
College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, People's Republic of China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, People's Republic of China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 May 5;252:119484. doi: 10.1016/j.saa.2021.119484. Epub 2021 Jan 19.
In this work, the water-soluble fluorescent Ag nanoclusters (DPA@Ag NCs) were first prepared based on D-Penicillamine (DPA) as a stabilizer, however, the fluorescence quantum yield (QY) of DPA@Ag NCs was very low, then Cu was employed to improve the fluorescence QY and the doped Ag nanoclusters with Cu (DPA@Ag/Cu NCs) were obtained. The study showed that the QY increased fourfold and the emission of nanoclusters changed from red to yellow after addition of Cu. The reasonfor change of fluorescent properties wasattributed to the change of self-assembly structures caused by adding Cu into reaction system, leading to the aggregation-induced emission enhancement (AIEE) effect and enhancing the band gap (Eg) between the HOMO and LUMO in nanoclusters. Subsequently, a fluorescent Ag sensor with high sensitivity and selectivity was established based on the DPA@Ag/Cu NCs as probes in aqueous solution. Experiments showed that the Ag could significantly quench the fluorescence of DPA@Ag/Cu NCs under experimental conditions, and there was a good linear relationship between the fluorescent intensity quenching value and Ag concentration in the range of 0.05-800 μM, and the limit of detection (LOD) was 0.03 μM (3σ/k). Meanwhile, most of common ions had no effect on the experimental results under the same conditions. In addition, the sensor was successfully applied on the detection of Ag in real water samples, and the recovery rate was 80.3-99.0%.
在这项工作中，首次以 D- 青霉胺 (DPA) 为稳定剂制备了水溶性荧光 Ag 纳米团簇 (DPA@Ag NCs)，然而，DPA@Ag NCs 的荧光量子产率 (QY) 非常低，然后引入 Cu 以提高荧光 QY，并获得掺杂 Cu 的 Ag 纳米团簇 (DPA@Ag/Cu NCs)。研究表明，加入 Cu 后，QY 增加了四倍，纳米团簇的发射从红色变为黄色。荧光性质变化的原因归因于加入 Cu 改变了反应体系中的自组装结构，导致聚集诱导发光增强 (AIEE) 效应，增强了纳米团簇中 HOMO 和 LUMO 之间的带隙 (Eg)。随后，基于 DPA@Ag/Cu NCs 作为探针，在水溶液中建立了一种高灵敏度和选择性的荧光 Ag 传感器。实验表明，在实验条件下，Ag 可以显著猝灭 DPA@Ag/Cu NCs 的荧光，荧光强度猝灭值与 Ag 浓度在 0.05-800 μM 范围内呈良好的线性关系，检测限 (LOD) 为 0.03 μM (3σ/k)。同时，在相同条件下，大多数常见离子对实验结果没有影响。此外，该传感器成功应用于实际水样中 Ag 的检测，回收率为 80.3-99.0%。
