Thermally induced formation of vacancy-islands on the atomic terraces of TiO2() surface covered by Pt
| Autor: | O Hakkel, János Szökő, Frigyes Solymosi, András Berkó |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Materials science
Annealing (metallurgy) chemistry.chemical_element Nanotechnology Surfaces and Interfaces Thermal treatment Atmospheric temperature range Condensed Matter Physics Surfaces Coatings and Films law.invention Crystallography chemistry law Vacancy defect Monolayer Materials Chemistry Thermal stability Scanning tunneling microscope Platinum |
| Zdroj: | Surface Science. :643-648 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/s0039-6028(02)01329-8 |
| Popis: | Thermal stability of ultrathin Pt layers deposited onto TiO 2 (110)-(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. |
| Databáze: | OpenAIRE |
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