Growth of Co nanoparticles on a nanostructured θ-Al2O3 film on CoAl(100)

被引：16

作者：

Rose, V. ^{[1
]}

Podgursky, V.

David, R.

Franchy, R.

机构：

[1] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA

[2] Tallinn Univ Technol, Dept Mat Technol, EE-19086 Tallinn, Estonia

[3] Forschungszentrum Julich, Inst Surfaces & Interfaces ISG 3, D-52425 Julich, Germany

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 03期

关键词：

Auger electron spectroscopy (AES); electron energy loss spectroscopy (EELS); low energy electron diffraction (LEED); scanning tunneling microscopy (STM); cobalt; aluminum oxide; cobalt oxide; clusters;

D O I：

10.1016/j.susc.2006.11.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have investigated the growth of Co nanoparticles on theta-Al2O3/CoAl(100) by means of Auger electron spectroscopy (AES), highresolution electron energy loss spectroscopy (EELS), low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Due to Volmer-Weber growth, Co forms particles with a mean diameter of approximately 2.5 nm and height of 0.8 nm. Even on the entirely covered oxide, there is no Ostwald ripening and Co particles stay structurally isolated. The nanoparticles exhibit a small size distribution and tend to form chains, as predetermined by the streak structure of the oxide template. For sufficient high coverages Co-core-CoO-shell nanoparticles may be evidenced, which is explained as a result of surfactant oxygen. The nanostructured particles may open the door to numerous applications, such as in catalysis and magnetoelectronic applications, where large areas of ordered nanodots are desired. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：786 / 791

页数：6