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

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 treatmen...

Descripción completa

Detalles Bibliográficos
Autores principales: Mayoral, Alvaro, Mejía Rosales, Sergio, Mariscal, Marcelo M., Pérez Tijerina, Eduardo, Yacamán, Miguel José
Formato: Artículo
Lenguaje:inglés
Publicado: Royal Society of Chemistry Publishing 2010
Materias:
Acceso en línea:http://eprints.uanl.mx/8948/1/The%20Co%E2%80%93Au%20interface%20in%20bimetallic%20nanoparticles.pdf
Descripción
Sumario: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.