期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 369, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132382
关键词
Silver nanoclusters; Phosphorescent probe; Ultrasensitive detection; Sensor; Silver(I) ions
资金
- National Natural Science Foundation of China [NSFC-32160600, NSFC-21864017, NSFC-31960495]
- Science and Technology Innovation Platform Project of Jiangxi Province [20192BCD40001]
- Education Department of Jiangxi Province [GJJ160006, GJJ160204]
Silver ion (Ag+) is a highly toxic heavy metal pollutant, and a sensitive and selective method for its detection is urgently needed for environmental protection. Water-soluble red-emitting micellized phosphorescent silver nanoclusters have been developed as probes for the rapid and simple detection of Ag+, exhibiting high selectivity and good recoveries in lake water samples.
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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