磷光
纳米团簇
胶束
猝灭(荧光)
光化学
检出限
水溶液中的金属离子
化学
光致发光
材料科学
分析化学(期刊)
X射线光电子能谱
水溶液
离子
荧光
纳米技术
化学工程
物理化学
有机化学
色谱法
光电子学
物理
量子力学
工程类
作者
Ziwen Tao,Guotao Yi,Chao Zeng,Qianfen Zhuang,Yong Wang
标识
DOI:10.1016/j.snb.2022.132382
摘要
Silver ion (Ag+) is one of the most toxic and dangerous heavy metal pollutants. Therefore, finding a simple, sensitive and selective approach to detect Ag+ is very urgent for environmental protection and risk reduction to human health. In this work, water-soluble red-emitting micellized phosphorescent silver nanoclusters (Ag29 @Na micelles) with a large stokes shift of 380 nm are prepared and used as sensitive and selective phosphorescent probes to realize the rapid and simple detection of Ag+. Upon adding Ag+, the phosphorescence of Ag29 @Na micelles is quenching, and the phosphorescence quenching ratio is linearly proportional to the Ag+ concentration over the range from 1 nM to 100 nM with the detection limit of 0.8 nM (S/N = 3). The Ag29 @Na micelles exhibit high selectivity for Ag+ over other potentially interfering metal ions. The quenching mechanism of Ag29 @Na micelles by Ag+ is studied in details using various analytical characterizations including UV–vis absorption spectroscopy, photoluminescence lifetime, X-ray photoelectron spectroscopy, transmission electron microscopy, and zeta potential, and the results denote that the aggregation between Ag29 @Na micelles and Ag+ is responsible for the phosphorescence quenching. The Ag29 @Na micelles-based phosphorescence probes are successfully applied to detect Ag+ in lake water samples with good recoveries of 98 %−108 %.
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