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Growth of Ultrathin Iron Oxide Films on Ag(100)

Merte, Lindsay LU ; Shipilin, Mikhail LU ; Ataran, Sara; Blomberg, Sara LU ; Zhang, Chu LU ; Mikkelsen, Anders LU ; Gustafson, Johan LU and Lundgren, Edvin LU (2015) In Journal of Physical Chemistry C 119(5). p.2572-2582
Abstract
Ultrathin iron oxide films are useful model materials for fundamental studies of surface processes and exhibit intriguing properties as catalysts, as demonstrated recently in a number of studies utilizing platinum as a substrate. We report a study of the initial stages of iron oxide film growth on an Ag(100) surface using scanning tunneling microscopy, low energy electron diffraction, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure spectroscopy, with the goal of elucidating the effects of the substrate material on FeOx film growth and physical properties. We demonstrate that a well-ordered, monolayer-thick FeO(111) film can be prepared which is similar to the well-studied structure formed on Pt(111), though... (More)
Ultrathin iron oxide films are useful model materials for fundamental studies of surface processes and exhibit intriguing properties as catalysts, as demonstrated recently in a number of studies utilizing platinum as a substrate. We report a study of the initial stages of iron oxide film growth on an Ag(100) surface using scanning tunneling microscopy, low energy electron diffraction, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure spectroscopy, with the goal of elucidating the effects of the substrate material on FeOx film growth and physical properties. We demonstrate that a well-ordered, monolayer-thick FeO(111) film can be prepared which is similar to the well-studied structure formed on Pt(111), though with a significantly expanded lattice constant indicative of smaller FeO buckling and weaker interactions with the substrate. Increased oxygen pressure during deposition leads to formation of a multilayer phase taking the form of well-ordered islands. Although superficially similar to FeO(111), spectroscopic measurements show a substantial proportion of Fe3+ in the phase. FeO(100) grains are observed upon deposition at elevated substrate temperatures, which is proposed to result from formation and oxidation of iron clusters embedded in the surface (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
119
issue
5
pages
2572 - 2582
publisher
The American Chemical Society
external identifiers
  • wos:000349136400038
  • scopus:84922349978
ISSN
1932-7447
DOI
10.1021/jp511496w
language
English
LU publication?
yes
id
c373f96a-05b6-4a06-95aa-6db6bf0af28e (old id 5175910)
date added to LUP
2015-03-25 12:33:01
date last changed
2017-08-27 03:43:11
@article{c373f96a-05b6-4a06-95aa-6db6bf0af28e,
  abstract     = {Ultrathin iron oxide films are useful model materials for fundamental studies of surface processes and exhibit intriguing properties as catalysts, as demonstrated recently in a number of studies utilizing platinum as a substrate. We report a study of the initial stages of iron oxide film growth on an Ag(100) surface using scanning tunneling microscopy, low energy electron diffraction, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure spectroscopy, with the goal of elucidating the effects of the substrate material on FeOx film growth and physical properties. We demonstrate that a well-ordered, monolayer-thick FeO(111) film can be prepared which is similar to the well-studied structure formed on Pt(111), though with a significantly expanded lattice constant indicative of smaller FeO buckling and weaker interactions with the substrate. Increased oxygen pressure during deposition leads to formation of a multilayer phase taking the form of well-ordered islands. Although superficially similar to FeO(111), spectroscopic measurements show a substantial proportion of Fe3+ in the phase. FeO(100) grains are observed upon deposition at elevated substrate temperatures, which is proposed to result from formation and oxidation of iron clusters embedded in the surface},
  author       = {Merte, Lindsay and Shipilin, Mikhail and Ataran, Sara and Blomberg, Sara and Zhang, Chu and Mikkelsen, Anders and Gustafson, Johan and Lundgren, Edvin},
  issn         = {1932-7447},
  language     = {eng},
  number       = {5},
  pages        = {2572--2582},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Growth of Ultrathin Iron Oxide Films on Ag(100)},
  url          = {http://dx.doi.org/10.1021/jp511496w},
  volume       = {119},
  year         = {2015},
}