The Co-Au interface in bimetallic nanoparticles: A high resolution STEM study

Alvaro Mayoral, Sergio Mejía-Rosales, Marcelo M. Mariscal, Eduardo Pérez-Tijerina, Miguel José-Yacamán

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2647-2651
Number of pages5
JournalNanoscale
Volume2
Issue number12
DOIs
StatePublished - Nov 2010
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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