Open AccessSingle Au Atom Doping of Silver Nanoclusters
Author(s) -
Marte van der Linden,
Arnoldus J. van Bunningen,
Lucia Amidani,
Maarten Bransen,
Hebatalla Elnaggar,
Pieter Glatzel,
Andries Meijerink,
Frank M. F. de Groot
Publication year - 2018
Publication title -
acs nano
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.554
H-Index - 382
eISSN - 1936-086X
pISSN - 1936-0851
DOI - 10.1021/acsnano.8b07807
Subject(s) - nanoclusters , xanes , extended x ray absorption fine structure , materials science , dopant , doping , cluster (spacecraft) , absorption (acoustics) , atom (system on chip) , absorption spectroscopy , electronic structure , analytical chemistry (journal) , spectroscopy , chemistry , nanotechnology , computational chemistry , optoelectronics , physics , optics , quantum mechanics , chromatography , computer science , embedded system , composite material , programming language
Ag 29 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 Au 1 Ag 28 (LA) 12 3- . The clusters were characterized using X-ray absorption spectroscopy at the Au L 3 -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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