Synthesis and characterization of titania films on Mo(1 1 0)

X. Lai, Q. Guo, Byoung Koun Min, D. W. Goodman

Research output: Contribution to journalArticle

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Abstract

Ultra-thin titania films were grown on a Mo(1 1 0) substrate by vapor depositing Ti in an O2 ambient (5 × 10-7 Torr) at 600 K, followed by annealing to 900-1200 K. X-ray photoelectron spectroscopy showed that titanium oxide films annealed to 900 K were partially reduced, exhibiting Ti4+, Ti3+ and Ti2+ species, whereas films annealed to 1200 K were fully oxidized and exhibited only Ti4+. Corresponding scanning tunneling microscopy measurements revealed layer-by-layer growth of titania films on Mo(1 1 0) at 900 K. Flat terraces with three different orientations were observed. The line spacings between the neighboring atomic rows for all terraces were ∼6.5 Å, suggesting epitaxial growth of TiO2(1 1 0)-(1 × 1). A further anneal of the films to 1200 K led to three-dimensional, rough surfaces for the fully oxidized films, indicating the formation of stable crystallites at high temperature.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalSurface Science
Volume487
Issue number1-3
DOIs
Publication statusPublished - 2001 Jul 20
Externally publishedYes

Fingerprint

titanium
Titanium
synthesis
Titanium oxides
Scanning tunneling microscopy
Crystallites
Epitaxial growth
titanium oxides
crystallites
Oxide films
oxide films
scanning tunneling microscopy
X ray photoelectron spectroscopy
Vapors
spacing
titanium dioxide
photoelectron spectroscopy
Annealing
vapors
annealing

Keywords

  • Growth
  • Molybdenum
  • Scanning tunneling microscopy
  • Titanium oxide
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Synthesis and characterization of titania films on Mo(1 1 0). / Lai, X.; Guo, Q.; Min, Byoung Koun; Goodman, D. W.

In: Surface Science, Vol. 487, No. 1-3, 20.07.2001, p. 1-8.

Research output: Contribution to journalArticle

Lai, X. ; Guo, Q. ; Min, Byoung Koun ; Goodman, D. W. / Synthesis and characterization of titania films on Mo(1 1 0). In: Surface Science. 2001 ; Vol. 487, No. 1-3. pp. 1-8.
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