Issue 12, 2010
From the journal:

Nanoscale

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

Alvaro Mayoral,a   Sergio Mejía-Rosales,ab   Marcelo M. Mariscal,c   Eduardo Pérez-Tijerinab  and  Miguel José-Yacamán*a  

* Corresponding authors

a Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas, USA
E-mail: Miguel.yacaman@utsa.edu

b Laboratorio de Nanociencias y Nanotecnología, Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León, México

c INFIQC/CONICET, Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina

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.

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

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Article information

DOI
https://doi.org/10.1039/C0NR00498G
Article type
Paper
Submitted
14 Jul 2010
Accepted
01 Sep 2010
First published
13 Oct 2010

Nanoscale, 2010,2, 2647-2651

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

A. Mayoral, S. Mejía-Rosales, M. M. Mariscal, E. Pérez-Tijerina and M. José-Yacamán, Nanoscale, 2010, 2, 2647 DOI: 10.1039/C0NR00498G

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