Zhou Ting-yao, Lin Li-ping, Rong Ming-cong, Jiang Ya-qi, Chen Xi
The MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, China.
Anal Chem. 2013 Oct 15;85(20):9839-44. doi: 10.1021/ac4023764. Epub 2013 Sep 24.
In this paper, the development of a simple method is described for preparing highly red fluorescent mercaptosuccinic acid stabilized AgAu alloy nanoclusters (MSA-AgAu NCs) through the core etching of Ag nanoparticles (NPs) and a galvanic exchange reaction using nonorganic solvent and no multistep centrifuge washing. The as-prepared MSA-AgAu NCs were characterized using spectroscopic and microscopic techniques. After covalently attaching methoxy-poly(ethylene glycol)-NH2 (m-PEG-NH2), PEGylated MSA-AgAu NCs were still stable even in 1 M NaCl. Probably based on the deposition of Al(3+)-enhanced fluorescence, the PEGylated MSA-AgAu NCs offered highly selective and sensitive sensing of Al(3+) in aqueous solution with a detection limit of 0.8 μM.
本文描述了一种简单方法的开发，该方法通过蚀刻银纳米颗粒（NPs）的核，并使用非有机溶剂且无需多步离心洗涤的电偶交换反应，来制备高红色荧光巯基琥珀酸稳定的AgAu合金纳米团簇（MSA-AgAu NCs）。使用光谱和显微镜技术对所制备的MSA-AgAu NCs进行了表征。在共价连接甲氧基聚（乙二醇）-NH2（m-PEG-NH2）后，即使在1 M NaCl中，聚乙二醇化的MSA-AgAu NCs仍保持稳定。可能基于Al(3+)增强荧光的沉积，聚乙二醇化的MSA-AgAu NCs对水溶液中的Al(3+)具有高选择性和灵敏的传感能力，检测限为0.8 μM。
