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We have investigated the atomic structure of thiol-protected (AuxAg1–x)312±55 clusters as a function of composition (x) by using aberration-corrected Scanning Transmission Electron Microscopy (STEM), in High Angle Annular Dark Field (HAADF) mode, combined with multislice electron scattering simulations of the STEM images. Three structural motifs are considered: icosahedral, fcc, and ino-decahedral. A combination of STEM intensity and diameter measurement is used to “fractionate” the deposited sample according to composition for atomic resolution imaging. We find that the structure depends critically on composition: the icosahedral structure dominates in Ag-rich clusters, while the fcc structure dominates in Au-rich clusters. The ino-decahedral structure was only observed in clusters with Au content greater than 30%.

the journal of physical chemistry c

Variation of the Core Atomic Structure of Thiolated (AuxAg1–x)312±55 Nanoclusters with Composition from Aberration-Corrected HAADF STEM