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

被引：32

作者：

Mayoral, Alvaro ^{[1
]}

Mejia-Rosales, Sergio ^{[1
,2
]}

Mariscal, Marcelo M. ^{[3
]}

Perez-Tijerina, Eduardo ^{[2
]}

Jose-Yacaman, Miguel ^{[1
]}

机构：

[1] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78251 USA

[2] Univ Autonoma Nuevo Leon, Fac Ciencias Fis & Matemat, Lab Nanociencias & Nanotecnol, San Nicolas De Los Garza 66450, Nuevo Leon, Mexico

[3] Univ Nacl Cordoba, INFIQC CONICET, Dept Matemat & Fis, Fac Ciencias Quim, RA-5000 Cordoba, Argentina

来源：

NANOSCALE | 2010年 / 2卷 / 12期

关键词：

CATALYTIC-PROPERTIES; AU/PD NANOPARTICLES; SURFACE-COMPOSITION; PD-AU; METAL; COBALT;

D O I：

10.1039/c0nr00498g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the formation of Au/Co nanoparticles and their characterization by aberration (C-s) 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.

引用

页码：2647 / 2651

页数：5

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