Fluorescence-Enhanced Sensing Mechanism of BSA-Protected Small Gold-Nanoclusters to Silver(I) Ions in Aqueous Solutions
Fluorescence-Enhanced Sensing Mechanism of BSA-Protected Small Gold-Nanoclusters to Silver(I) Ions in Aqueous Solutions
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BSA 保护的小金纳米团簇对水溶液中银 (I) 离子的荧光增强传感机制
DOI：
10.1021/jp403466b
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发表时间：
2013-08-08
影响因子：
3.7
通讯作者：
Wu, Yuqing
中科院分区：
文献类型：
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作者：
Li, Hong-Wei;Yue, Yuan;Wu, Yuqing
我们报道了BSA保护的小金纳米簇(Au16NCs@BSA)对银(I)离子(Ag+)的响应机理。用Ag+滴定Au16NCs@BSA溶液时，荧光光谱发生蓝移和增强，而对其他金属离子则没有观察到类似的影响。同时，在Ag+诱导的Au16NCs@BSA的UV-Vis吸收光谱中观察到一个等色点，这表明一种物质向另一种物质的化学计量转化。通过X射线光电子能谱(XPS)、高分辨电子显微镜(HRTEM)和MALDI-TOF质谱学测量，确定了Au16NCs@BSA将Ag+还原为Ag-0，其中Au16NCs在形成杂化Au@AgNCs加合物过程中起着还原Ag+的作用。所揭示的机理为构建高发光合金纳米团簇提供了一种简便、温和的方法。
We report the clarification of responsive mechanism of the BSA-protected small gold nanoclusters (Au16NCs@ BSA) to silver(I) ions (Ag+). The titration of Au16NCs@BSA solutions with Ag+ produces a blue-shift and enhancement of the fluorescence spectra, but no similar effects can be observed for other metal ions. Meanwhile, an isosbestic point in UV-vis absorbance spectra of Au16NCs@BSA induced by Ag+ is observed, which indicates a stoichiometric conversion of one substance to another. Through X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and MALDI-TOF mass spectrum measurements, the reduction of Ag+ to Ag-0 by Au16NCs@BSA have been ascertained, where the Au16NCs act as reductant toward Ag+ in forming hybrid Au@AgNCs adducts. The mechanism revealed provided a facile and mild method to build high luminescent alloy nanoclusters.