The Co–Au interface in bimetallic nanoparticles: a high resolution STEM study

Mayoral, Alvaro y Mejía Rosales, Sergio y Mariscal, Marcelo M. y Pérez Tijerina, Eduardo y Yacamán, Miguel José (2010) The Co–Au interface in bimetallic nanoparticles: a high resolution STEM study. Nanoscale, 2. pp. 2647-2651. ISSN 2040-3364

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Resumen

We report the formation of Au/Co nanoparticles and their characterization by aberration (Cs) corrected scanning transmission electron microscopy (STEM). The nanoparticles were synthesized by inert gas condensation, forming initially core-shell and bimetallic crystals. However, after thermal treatment at normal atmospheric conditions, the Co nanoparticles changed their morphology into a fine layer forming a perfect interface with the gold. The ordering of the zone rich in Co presents a fcc arrangement matching the gold lattice. The atomic analysis on the interface and the comparison of the STEM images with numerical simulations corroborated the atomic substitution of gold by cobalt.

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