Thermally induced formation of vacancy-islands on the atomic terraces of TiO2(1 1 0) surface covered by Pt

A. Berkó, O. Hakkel, J. Szöko, F. Solymosi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Thermal stability of ultrathin Pt layers deposited onto TiO2(1 1 0)-(1 × n) surface was studied by scanning tunneling microscopy in the temperature range of 300-1200 K. Besides the formation of 3D particles and the gradual sintering of the initial clusters, a unique morphological feature - one monolayer (ML) deep vacancy-islands (pits) - developed as a result of annealing above 1000 K. This appeared on the atomic terraces of the substrate covered by Pt of a few percent monolayer. The edge of these pits were typically decorated by Pt nanoparticles grown during the annealing procedure, showing that the bonding between the admetal and the substrate is the strongest at these sites. The formation of the vacancy-islands can be explained by the decoration process activated by the thermal treatment above 500 K. Depending on the Pt coverage, two types of morphological states can be distinguished: (1) at very low coverages (0.15 ML) few Pt nanoparticles are localized in a particular vacancy-island of round shape, typically at the perimeter of the pit.

Original languageEnglish
Pages (from-to)643-648
Number of pages6
JournalSurface Science
Volume507-510
DOIs
Publication statusPublished - Jun 2002

Fingerprint

Vacancies
Monolayers
Annealing
Nanoparticles
nanoparticles
annealing
Scanning tunneling microscopy
Substrates
scanning tunneling microscopy
sintering
Thermodynamic stability
thermal stability
Sintering
Heat treatment
Temperature
temperature

Keywords

  • Platinum
  • Scanning tunneling microscopy
  • Surface structure, morphology, roughness, and topography
  • Titanium oxide

ASJC Scopus subject areas

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

Cite this

Thermally induced formation of vacancy-islands on the atomic terraces of TiO2(1 1 0) surface covered by Pt. / Berkó, A.; Hakkel, O.; Szöko, J.; Solymosi, F.

In: Surface Science, Vol. 507-510, 06.2002, p. 643-648.

Research output: Contribution to journalArticle

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AU - Hakkel, O.

AU - Szöko, J.

AU - Solymosi, F.

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N2 - Thermal stability of ultrathin Pt layers deposited onto TiO2(1 1 0)-(1 × n) surface was studied by scanning tunneling microscopy in the temperature range of 300-1200 K. Besides the formation of 3D particles and the gradual sintering of the initial clusters, a unique morphological feature - one monolayer (ML) deep vacancy-islands (pits) - developed as a result of annealing above 1000 K. This appeared on the atomic terraces of the substrate covered by Pt of a few percent monolayer. The edge of these pits were typically decorated by Pt nanoparticles grown during the annealing procedure, showing that the bonding between the admetal and the substrate is the strongest at these sites. The formation of the vacancy-islands can be explained by the decoration process activated by the thermal treatment above 500 K. Depending on the Pt coverage, two types of morphological states can be distinguished: (1) at very low coverages (0.15 ML) few Pt nanoparticles are localized in a particular vacancy-island of round shape, typically at the perimeter of the pit.

AB - Thermal stability of ultrathin Pt layers deposited onto TiO2(1 1 0)-(1 × n) surface was studied by scanning tunneling microscopy in the temperature range of 300-1200 K. Besides the formation of 3D particles and the gradual sintering of the initial clusters, a unique morphological feature - one monolayer (ML) deep vacancy-islands (pits) - developed as a result of annealing above 1000 K. This appeared on the atomic terraces of the substrate covered by Pt of a few percent monolayer. The edge of these pits were typically decorated by Pt nanoparticles grown during the annealing procedure, showing that the bonding between the admetal and the substrate is the strongest at these sites. The formation of the vacancy-islands can be explained by the decoration process activated by the thermal treatment above 500 K. Depending on the Pt coverage, two types of morphological states can be distinguished: (1) at very low coverages (0.15 ML) few Pt nanoparticles are localized in a particular vacancy-island of round shape, typically at the perimeter of the pit.

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