A new recipe for preparing oxidized TiO2(110) surfaces:An STM study
| Autor: | Jonas Ø. Hansen, Stefan Wendt, Estephania Lira, Lutz Lammich, J. Matthiesen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Rutile TiO2(110) 02 engineering and technology 010402 general chemistry 01 natural sciences O-ot adatoms law.invention OHt groups law CHEMISTRY O-2 DISSOCIATION Oxidizing agent Materials Chemistry H2O WATER TIO2 PHOTOCATALYSIS H-ad species (OHbr groups) TITANIUM-DIOXIDE SCANNING-TUNNELING-MICROSCOPY REDUCED RUTILE TIO2(110) Surfaces and Interfaces OXYGEN ADATOMS 021001 nanoscience & nanotechnology Condensed Matter Physics Scanning tunneling microscopy (STM) OH GROUPS 0104 chemical sciences Surfaces Coatings and Films Crystallography Rutile ELECTRON Scanning tunneling microscope 0210 nano-technology Saturation (chemistry) |
| Zdroj: | Hansen, J O, Matthiesen, J, Lira, E, Lammich, L & Wendt, S 2017, ' A new recipe for preparing oxidized TiO2(110) surfaces : An STM study ', Surface Science, vol. 666, pp. 113-122 . https://doi.org/10.1016/j.susc.2017.09.001 |
| DOI: | 10.1016/j.susc.2017.09.001 |
| Popis: | Using high-resolution scanning tunneling microscopy (STM), we have studied the oxidation of rutile TiO2(110)-(1x1) surfaces with Had species at room temperature. We followed the evolution of various stable species as function of the O-2 exposure, and the nature of the ultimately dominating species in the Ti troughs is described. When O-2 saturation was accomplished using a glass-capillary array doser, we found that on-top O (O-ot) adatoms are the predominant surface species. In contrast, when O-2 was supplied via backfilfing of the chamber the predominant surface species are tentatively assigned to terminal OH groups. We argue that unintended reactions with the chamber walls have a strong influence on the formed surface species, explaining scattered results in the literature. On the basis of our STM data we propose an alternative, easy way of preparing oxidized TiO2(110) surfaces with O-ot adatoms (o-TiO2). It is certain that o-TiO2(110) surfaces prepared according to this recipe do not have any residual surface O vacancies. This contradicts the situation when oxidizing reduced TiO2(110) surfaces with O vacancies, where some O vacancies persist. (C) 2017 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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