Single Au Atom Doping of Silver Nanoclusters.
Marte van der LindenArnoldus J van BunningenLucia AmidaniMaarten BransenHebatalla ElnaggarPieter GlatzelAndries MeijerinkFrank M F DeGrootPublished in: ACS nano (2018)
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)123-. 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.
Keyphrases
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- quantum dots
- visible light
- energy transfer
- reduced graphene oxide
- mass spectrometry
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- gold nanoparticles
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- magnetic resonance imaging
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- metal organic framework
- african american
- high performance liquid chromatography
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