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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
08:49

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Published on: December 4, 2014

The new high-temperature surface structure on reduced TiO2(001).

A Busiakiewicz1, Z Klusek, M Rogala

  • 1Division of Physics and Technology of Nanometre Structures, Department of Solid State Physics, University of Lodz, 90-236 Lodz, Pomorska 149/153, Poland. adambus@std2.phys.uni.lodz.pl

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 16, 2011
PubMed
Summary
This summary is machine-generated.

High-temperature heating of TiO(2)(001) surface reveals new structures. Scanning tunnelling microscopy (STM) and spectroscopy (UPS/CITS) identified unique electronic properties and ordering, suggesting a Ti(2)O(3) composition for coexisting grains.

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Area of Science:

  • Surface science
  • Materials science
  • Nanotechnology

Background:

  • The TiO(2)(001) surface is a crucial model system for understanding titanium dioxide properties.
  • High-temperature treatments can induce significant surface reconstructions and phase transformations.

Purpose of the Study:

  • To investigate the topographic and electronic structure of a high-temperature phase on the TiO(2)(001) surface.
  • To characterize the ordering and periodicity of the new surface structure.
  • To determine the chemical composition of coexisting grains.

Main Methods:

  • Scanning tunnelling microscopy (STM) for topographic imaging.
  • Ultraviolet photoelectron spectroscopy (UPS) for electronic structure analysis.
  • Current imaging tunnelling spectroscopy (CITS) for local electronic density of states mapping.

Main Results:

  • STM revealed novel domain-like ordering and periodicity on the TiO(2)(001) surface after heating at 1173 K.
  • UPS detected a surface state approximately 1.1 eV below the Fermi level.
  • CITS confirmed periodic maxima in the local density of states at 1.1-1.2 eV below the Fermi level, correlating with the new structure's rows.
  • CITS analysis indicated that coexisting small grains have a chemical composition closer to Ti(2)O(3) than TiO(2-x).

Conclusions:

  • A distinct high-temperature structure with unique ordering and electronic properties is formed on TiO(2)(001).
  • The electronic structure is characterized by a surface state and periodic density of states maxima.
  • The coexisting grains suggest a potential phase transformation towards Ti(2)O(3) under these conditions.