Single Au Atom Doping of Silver Nanoclusters

Ag29 nanoclusters capped with lipoic acid (LA) can be doped with Au. The doped clusters show enhanced stability and increased luminescence efficiency. We attribute the higher quantum yield to an increase in the rate of radiative decay. With mass spectrometry, the Au-doped clusters were found to cons...

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Bibliographic Details
Published inACS nano Vol. 12; no. 12; pp. 12751 - 12760
Main Authors van der Linden, Marte, van Bunningen, Arnoldus J, Amidani, Lucia, Bransen, Maarten, Elnaggar, Hebatalla, Glatzel, Pieter, Meijerink, Andries, de Groot, Frank M. F
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 26.12.2018
Subjects
Physics
Ag29
luminescence
Au1Ag28
doping
bimetallic nanocluster
X-ray spectroscopy
structure elucidation
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Summary:Ag29 nanoclusters capped with lipoic acid (LA) can be doped with Au. The doped clusters show enhanced stability and increased luminescence efficiency. We attribute the higher quantum yield to an increase in the rate of radiative decay. With mass spectrometry, the Au-doped clusters were found to consist predominantly of Au1Ag28(LA)12 3–. The clusters were characterized using X-ray absorption spectroscopy at the Au L3-edge. Both the extended absorption fine structure (EXAFS) and the near edge structure (XANES) in combination with electronic structure calculations confirm that the Au dopant is preferentially located in the center of the cluster. A useful XANES spectrum can be recorded for lower concentrations, or in shorter time, than the more commonly used EXAFS. This makes XANES a valuable tool for structural characterization.
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ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.8b07807