Mass Spectrometry and Dynamics of Gold Adatoms Observed on the Surface of Size-Selected Au Nanoclusters

We report the imaging, mass spectrum, and dynamical behavior of adatoms and small clusters observed on the surface facets of size-selected, truncated octahedral gold clusters, Au N (N = 923 ± 23), via aberration-corrected scanning transmission electron microscopy. Our quantitative atom counting meas...

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Bibliographic Details
Published in:Nano letters 2012-01, Vol.12 (1), p.91-95
Main Authors: Wang, Z. W, Palmer, R. E
Format: Article
Language:English
Subjects:
Aberration
Atomic structure
Clusters
Counting
Cross-disciplinary physics: materials science
rheology
Dynamics
Exact sciences and technology
Gold
Gold - chemistry
Macromolecular Substances - chemistry
Mass spectrometry
Mass Spectrometry - methods
Materials science
Materials Testing
Methods of nanofabrication
Molecular Conformation
Nanocrystalline materials
Nanoparticles
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Nanostructures - chemistry
Nanostructures - ultrastructure
Particle Size
Physics
Self-assembly
Surface Properties
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Summary:We report the imaging, mass spectrum, and dynamical behavior of adatoms and small clusters observed on the surface facets of size-selected, truncated octahedral gold clusters, Au N (N = 923 ± 23), via aberration-corrected scanning transmission electron microscopy. Our quantitative atom counting measurements show that most (∼70%) of the species on the surface are single Au adatoms. Such species are now proposed as key elements of the atomic structure of both monolayer-protected nanoclusters (nanoparticles) and self-assembled monolayers and may also play a role in gold nanocatalysis. The adatoms are found on both {100} and {111} facets with similar probabilities.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl2037112