Abstract
Matrix-stabilized silver clusters and stable luminescent few-atom silver clusters, referred to as silver nanodots, show notable difference in their photophysical properties. We present recent research on deciphering the nature of silver clusters and nanodots and understanding the factors that lead to variations in luminescent mechanisms. Due to their relatively simple structure, the matrix-stabilized clusters have been well studied. However, the single-stranded DNA (ssDNA)-stabilized silver nanodots that show the most diverse emission wavelengths and the best photophysical properties remain mysterious species. It is clear that their photophysical properties highly depend on their protection scaffolds. Analyses from combinations of high-performance liquid chromatography, inductively coupled plasma-atomic emission spectroscopy, electrophoresis, and mass spectrometry indicate that about 10 to 20 silver atoms form emissive complexes with ssDNA. However, it is possible that not all of the silver atoms in the c...
Highlights
Protection groups have played a critical role in the stabilization of such silver clusters
When it is stable in aqueous solution, the supramolecular structure between a silver cluster and its protection group is named a “silver nanocluster” or “silver nanodot.”
It is essential to determine what factors lead to stable luminescent silver nanodots in aqueous solution and how to improve their chemical and photophysical properties
Summary
Luminescent silver clusters have been developed from solid phaseprotected, unstable clusters into stable species in aqueous solution.[1,2,3,4,5] Protection groups have played a critical role in the stabilization of such silver clusters.
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