Article Abstract:
The quantitative the high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and high-resolution TEM measurements are carried out on subnanometer gold clusters that have indicated cluster cores of 13 atoms with average diameters of 0.8 nm. The experiments have provided direct evidence that [Au.sub.13] clusters adopt an icosahedral structure while those with average diameters near 2 nm adopt unrelaxed bonding habits characteristic of the bulk fcc structure.
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Article Abstract:
The electron transfer dynamics of oligo(p-phenylene-ethynylene) (OPE) SAM on Au(111) is studied by resonant photoemission spectroscopy and the ultrafast electron transfer from OPE molecules to Au substrate. The time scale for the charge transfer is much less than 6 fs, the core-hole lifetime for Cls which strongly suggests that there is an intense interfacial electronic coupling between OPE molecules and the Au substrate.
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Article Abstract:
The electrochemical behavior of arrays of Au nanoparticles assembled on Au electrodes modified by 11-mercaptoudecanoic acid (MUA) and ply-L-lysine (PLYS) is investigated as a function of the particle number density. The sequential self-assembly of MUA and PLYS on Au surfaces generates ultrathin compact films with a homogeneous coverage and very low density of surface defects.
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