A sensitive chemosensor for nitro-containing compounds based on Au nanoclusters/Ba2+co-assembly system: The crucial role of ligands to metal charge transfer
A sensitive chemosensor for nitro-containing compounds based on Au nanoclusters/Ba2+co-assembly system: The crucial role of ligands to metal charge transfer
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基于Au纳米团簇/Ba2共组装系统的含硝基化合物的灵敏化学传感器：配体对金属电荷转移的关键作用
DOI：
10.1016/j.colsurfa.2021.127160
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发表时间：
2021-07-17
影响因子：
5.2
通讯作者：
Qi, Wei
中科院分区：
文献类型：
--
作者：
Shen, Jinglin;Bi, Yue;Qi, Wei
金纳米团簇（AuNCs）是一类很有前途的无机-有机杂化纳米材料，具有优异的光致发光性能。了解它们的发光机理对于开发功能性AuNCs基材料具有重要意义。本工作制备了硫代巴比妥酸修饰的金纳米粒子（TBA-AuNCs），并通过与Ba ~（2+）的共组装来调控其光致发光性能。随着TBA-AuNCs/Ba ~（2+）复合物的形成，发光强度急剧增强。透射电子显微镜、扫描电子显微镜和X射线光电子能谱等结构表征证实了TBA-AuNCs与Ba 2+的杂化。pH依赖的光致发光以及zeta电位的测量表明，配体到金属的电荷转移（LMCT）是至关重要的TBA-AuNCs/Ba 2+的发射性能的调节。基于这种特殊的光致发光机制，TBA-AuNCs/Ba 2+配合物被用作硝基取代芳香族化合物的化学传感器。TBA-AuNCs/Ba ~（2+）的发光强度在不同咪唑衍生物中对2-甲基-4-硝基咪唑有选择性的猝灭。同时，配合物对对硝基苯胺和邻硝基苯酚也表现出很高的灵敏度。因此，TBA-AuNCs/Ba 2+组装体在含硝基化合物的检测中具有潜在的应用价值，在药物分析、环境保护等相关领域有着广泛的应用前景。
Gold nanoclusters (AuNCs) are a class of promising inorganic-organic hybrid nanomaterials with exceptional photoluminescent properties. The understanding of their photoluminescent mechanism is important for developing functional AuNCs-based materials. In this work, thiobarbituric acid-modified AuNCs (TBA-AuNCs) was prepared and its photoluminescent property was modulated through co-assembly with Ba2+. The emission intensity was sharply enhanced with the formation of TBA-AuNCs/Ba2+ complex. Structural characterization including transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy confirmed the hybridization of TBA-AuNCs with Ba2+. The pH-dependent photoluminescence as well as zeta potential measurements demonstrated that the ligand to metal charge transfer (LMCT) is crucial for the regulation of emission property of the TBA-AuNCs/Ba2+. Based on this special photoluminescent mechanism, the TBA-AuNCs/Ba2+ complex was employed as a chemical sensor for nitro-substituted aromatic compounds. The emission intensity of TBA-AuNCs/Ba2+ selectively displayed sharp quenching in response to 2-methyl-4-nitroimidazole among various imidazole derivatives. Simultaneously, the complex also showed high sensitivity toward pnitroaniline and 2-nitrophenol. Therefore, the developed TBA-AuNCs/Ba2+ assemblies are potential in detecting the nitro-containing compounds, which will find applications in pharmaceutical analysis, environmental protection and other related fields.