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Impact of Oxygen Coadsorption on Intercalation of Cobalt under the h-BN Nanomesh.

Preobrajenski, Alexei LU ; Ng, May Ling LU ; Vinogradov, N A; Vinogradov, A S; Lundgren, Edvin LU ; Mikkelsen, Anders LU and Mårtensson, Nils LU (2009) In Nano Letters 9. p.2780-2787
Abstract
The process of penetration of cobalt atoms through the h-BN nanomesh on Rh(111) is investigated with both spectroscopic and microscopic techniques. It is discovered that oxygen coadsorption can drastically modify the physical properties and behavior of the deposited Co clusters upon postannealing. In the absence of oxygen, Co forms small nanoparticles in the pores (bonding parts) of the h-BN nanomesh, which start to agglomerate at elevated temperatures without any considerable intercalation. However, even a tiny amount of coadsorbed oxygen reduces cobalt agglomeration and greatly promotes its intercalation and trapping under h-BN. The oxygen exposure necessary for a complete intercalation of 1-2 monolayers of Co is very low, and the... (More)
The process of penetration of cobalt atoms through the h-BN nanomesh on Rh(111) is investigated with both spectroscopic and microscopic techniques. It is discovered that oxygen coadsorption can drastically modify the physical properties and behavior of the deposited Co clusters upon postannealing. In the absence of oxygen, Co forms small nanoparticles in the pores (bonding parts) of the h-BN nanomesh, which start to agglomerate at elevated temperatures without any considerable intercalation. However, even a tiny amount of coadsorbed oxygen reduces cobalt agglomeration and greatly promotes its intercalation and trapping under h-BN. The oxygen exposure necessary for a complete intercalation of 1-2 monolayers of Co is very low, and the formation of oxidic species can be easily avoided. The nanomesh structure remains intact upon intercalating submonolayer amounts of Co, while further intercalation gradually distorts and finally destroys the periodic corrugation. Fortunately, this process is not accompanied by damaging the h-BN sheet itself, and the original structure can be restored by removing Co upon annealing at higher temperatures. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
9
pages
2780 - 2787
publisher
The American Chemical Society
external identifiers
  • wos:000268138600048
  • pmid:19492822
  • scopus:67650376603
ISSN
1530-6992
DOI
10.1021/nl901316p
language
English
LU publication?
yes
id
278076a8-0ea0-4e18-b551-0d25293698b9 (old id 1434557)
date added to LUP
2009-07-01 15:33:26
date last changed
2017-10-08 04:00:43
@article{278076a8-0ea0-4e18-b551-0d25293698b9,
  abstract     = {The process of penetration of cobalt atoms through the h-BN nanomesh on Rh(111) is investigated with both spectroscopic and microscopic techniques. It is discovered that oxygen coadsorption can drastically modify the physical properties and behavior of the deposited Co clusters upon postannealing. In the absence of oxygen, Co forms small nanoparticles in the pores (bonding parts) of the h-BN nanomesh, which start to agglomerate at elevated temperatures without any considerable intercalation. However, even a tiny amount of coadsorbed oxygen reduces cobalt agglomeration and greatly promotes its intercalation and trapping under h-BN. The oxygen exposure necessary for a complete intercalation of 1-2 monolayers of Co is very low, and the formation of oxidic species can be easily avoided. The nanomesh structure remains intact upon intercalating submonolayer amounts of Co, while further intercalation gradually distorts and finally destroys the periodic corrugation. Fortunately, this process is not accompanied by damaging the h-BN sheet itself, and the original structure can be restored by removing Co upon annealing at higher temperatures.},
  author       = {Preobrajenski, Alexei and Ng, May Ling and Vinogradov, N A and Vinogradov, A S and Lundgren, Edvin and Mikkelsen, Anders and Mårtensson, Nils},
  issn         = {1530-6992},
  language     = {eng},
  pages        = {2780--2787},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Impact of Oxygen Coadsorption on Intercalation of Cobalt under the h-BN Nanomesh.},
  url          = {http://dx.doi.org/10.1021/nl901316p},
  volume       = {9},
  year         = {2009},
}