Ultrasensitive detection of silver(I) ions based on water-soluble micellized phosphorescent silver nanoclusters co-protected by 1,3-benzenedithiol and triphenylphosphine

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 (Ag 29 @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 Ag 29 @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 Ag 29 @Na micelles exhibit high selectivity for Ag + over other potentially interfering metal ions . The quenching mechanism of Ag 29 @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 Ag 29 @Na micelles and Ag + is responsible for the phosphorescence quenching. The Ag 29 @Na micelles-based phosphorescence probes are successfully applied to detect Ag + in lake water samples with good recoveries of 98 %−108 %.