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Title: Growth of Co nanoparticles on a nanostructured {theta}-Al(sub 2)O(sub 3) film on CoAl(100).

Abstract

We have investigated the growth of Co nanoparticles on {theta}-Al{sub 2}O{sub 3}/CoAl(1 0 0) by means of Auger electron spectroscopy (AES), high-resolution 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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
914937
Report Number(s):
ANL/XSD/JA-58462
Journal ID: ISSN 0039-6028; SUSCAS; TRN: US200817%%21
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Surf. Sci.; Journal Volume: 601; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CRYSTAL GROWTH; COBALT; NANOSTRUCTURES; COBALT ALLOYS; ALUMINIUM ALLOYS; ALUMINIUM OXIDES; SUBSTRATES; USES

Citation Formats

Rose, V., Podgursky, V., David, R., Franchy, R., Tallinn Univ. of Technology, and Research Center Julich. Growth of Co nanoparticles on a nanostructured {theta}-Al(sub 2)O(sub 3) film on CoAl(100).. United States: N. p., 2007. Web. doi:10.1016/j.susc.2006.11.009.
Rose, V., Podgursky, V., David, R., Franchy, R., Tallinn Univ. of Technology, & Research Center Julich. Growth of Co nanoparticles on a nanostructured {theta}-Al(sub 2)O(sub 3) film on CoAl(100).. United States. doi:10.1016/j.susc.2006.11.009.
Rose, V., Podgursky, V., David, R., Franchy, R., Tallinn Univ. of Technology, and Research Center Julich. Mon . "Growth of Co nanoparticles on a nanostructured {theta}-Al(sub 2)O(sub 3) film on CoAl(100).". United States. doi:10.1016/j.susc.2006.11.009.
@article{osti_914937,
title = {Growth of Co nanoparticles on a nanostructured {theta}-Al(sub 2)O(sub 3) film on CoAl(100).},
author = {Rose, V. and Podgursky, V. and David, R. and Franchy, R. and Tallinn Univ. of Technology and Research Center Julich},
abstractNote = {We have investigated the growth of Co nanoparticles on {theta}-Al{sub 2}O{sub 3}/CoAl(1 0 0) by means of Auger electron spectroscopy (AES), high-resolution 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.},
doi = {10.1016/j.susc.2006.11.009},
journal = {Surf. Sci.},
number = 2007,
volume = 601,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}