A facile synthesis of highly stable and luminescent Ag clusters: a steady-state and time-resolved spectroscopy study

Language
en
Document Type
Article
Issue Date
2016-10-04
Issue Year
2015
Authors
Kumar Pal, Nabin
Kryschi, Carola
Editor
Abstract

In this paper, we reported a very simple and environmentally friendly procedure for the synthesis of bright luminescent and nearly monodisperse Ag nanoclusters stabilized by a poly(N-vinylpyrrolidone) homopolymer. In this synthesis route acetonitrile or N,N-dimethylformamide (DMF) acts as both solvent and a reducing agent at their respective reflux temperatures. The as-prepared Ag clusters were found to be highly stable in various solvents as well as show nearly no changes in their emission intensity in solutions with different pH values and ionic strengths. Remarkably, the acetonitrile method predominantly produces blue emitting Ag clusters with a photoluminescence (PL) emission maximum at 424 nm (quantum yield 3.5%), whereas mainly blue-green emitting Ag clusters with the PL emission maximum at 450 nm (quantum yield 2.7%) were formed using the DMF method. The photo-physical, electronic, structural and morphological properties of the Ag clusters were investigated by performing UV/Vis absorption spectroscopy, stationary and time-resolved PL spectroscopy, X-ray photoelectron spectroscopy, femtosecond transient absorption spectroscopy, and transmission electron microscopy experiments.

Journal Title
Physical Chemistry Chemical Physics
Volume
17
Issue
3
Citation
Physical Chemistry Chemical Physics 17.3 (2015): S. 1957-1965. <http://pubs.rsc.org/en/content/articlelanding/2015/cp/c4cp03683b#!divAbstract>
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