Lepidocrocite-like structure of the TiO2 monolayer grown on Ag(100)

Andrea Atrei, Anna Maria Ferrari, D. Szieberth, Brunetto Cortigiani, Gianfranco Rovida

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Abstract

Titanium oxide ultrathin films were grown on Ag(100) by evaporation of titanium in an O2 atmosphere. The growth of the oxide films was monitored by means of XPS. The Ti2p XPS spectra indicate the formation of films with a TiO2 stoichiometry in the whole range of coverages studied here. The STM results show that titania films appear to grow as islands of uniform thickness up to the completion of the first layer. Up to the formation of one complete monolayer, a (5 × 1) LEED pattern is observed. This pattern can be interpreted as a coincidence mesh and the lattice parameters of the oxide layer are very close to those of TiO2 films with a lepidocrocite-like structure. However, the STM images show a long-range coincidence between the periodicity of the oxide film and that of the substrate along the short side of the oxide unit cell revealing that this lattice parameter is not exactly equal to that of the substrate. Above the monolayer coverage, additional spots become visible in the LEED pattern which can be interpreted in terms of the unit cell of rutile (110). The structural determination was carried out for the monolayer of titania by means of XPD and LEED intensity analysis. The results of these investigations demonstrate that the titania monolayer has a lepidocrocite-like structure. The DFT calculations carried out for the titania monolayer show the higher stability of the lepidocrocite structure with respect to other structures derived from crystallographic planes of bulk TiO2 phases. Moreover, these calculations allow us to determine the oxide-substrate interface energy as well as to clarify the effect of the strain on the stability of the oxide layer.

Original languageEnglish
Pages (from-to)11587-11595
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume12
Issue number37
DOIs
Publication statusPublished - Oct 7 2010

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Monolayers
titanium
Oxides
oxide films
oxides
Oxide films
lattice parameters
Lattice constants
Substrates
X ray photoelectron spectroscopy
cells
titanium oxides
Ultrathin films
rutile
periodic variations
mesh
stoichiometry
Titanium
Discrete Fourier transforms
Stoichiometry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Lepidocrocite-like structure of the TiO2 monolayer grown on Ag(100). / Atrei, Andrea; Ferrari, Anna Maria; Szieberth, D.; Cortigiani, Brunetto; Rovida, Gianfranco.

In: Physical Chemistry Chemical Physics, Vol. 12, No. 37, 07.10.2010, p. 11587-11595.

Research output: Contribution to journalArticle

Atrei, Andrea ; Ferrari, Anna Maria ; Szieberth, D. ; Cortigiani, Brunetto ; Rovida, Gianfranco. / Lepidocrocite-like structure of the TiO2 monolayer grown on Ag(100). In: Physical Chemistry Chemical Physics. 2010 ; Vol. 12, No. 37. pp. 11587-11595.
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