pH-Responsive aggregation-induced emission of Au nanoclusters and crystallization of the Au(I)–thiolate shell
pH-Responsive aggregation-induced emission of Au nanoclusters and crystallization of the Au(I)–thiolate shell
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DOI：
10.1039/c7qm00609h
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发表时间：
2018-05
影响因子：
7
通讯作者：
Jianxing Wang;N. Goswami;Tong Shu;L. Su;Xueji Zhang
中科院分区：
文献类型：
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作者：
Jianxing Wang;N. Goswami;Tong Shu;L. Su;Xueji Zhang
聚集诱导发光（AIE）是增强金属纳米团簇（NC）发光的一种有吸引力的策略。然而，合理控制Au纳米粒子的AIE是目前对复杂表面/界面结构的关键挑战和基本理解之一，并且AIE型Au纳米粒子的发射机制远未完成。在这项研究中，我们报告了一个pH可控的AIE伴随着一个自组装/拆卸过程的Au NCs与Au（I）-硫醇盐配合物与谷胱甘肽（GSH）保护的AIE型Au NCs作为一个模型。发现溶液pH可用于控制包封Au NC的Au（I）-硫醇盐络合物的形貌，从而产生不同的AIE。透射电子显微镜（TEM）研究表明，Au纳米粒子基本上嵌入在Au（I）-硫醇盐复合物的pH敏感性超分子组装体中。进一步发现在Au纳米碳表面上发生了一定程度的Au（I）-硫醇盐壳的结晶。这项研究扩展了AIE型金属纳米粒子的表面/界面结构及其PL和自组装控制的知识。
Aggregation-induced emission (AIE) is an attractive strategy for enhancing the luminescence of metal nanoclusters (NCs). However, rational control of the AIE of Au NCs is currently one of the key challenges and fundamental understanding of the complex surface/interfacial structures, and the emission mechanism of AIE-type Au NCs is far from complete. In this study, we report a pH-controllable AIE accompanied with a self-assembly/disassembly process of Au NCs with Au(I)–thiolate complexes with glutathione (GSH)-protected AIE-type Au NCs as a model. It was found that the solution pH could be used to control the landscape of the Au(I)–thiolate complexes encapsulating the Au NCs, generating varied AIE. Transmission electron microscopy (TEM) studies revealed that the Au NCs were essentially embedded inside the pH-sensitive supramolecular assemblies of the Au(I)–thiolate complexes. It was further found that a certain degree of crystallization of the Au(I)–thiolate shell occurred on the surface of the Au NCs. This study expands the knowledge of both the surface/interfacial structures of AIE-type metal NCs and the control of their PL and their self-assembly.