uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Chemical vapor deposition of ordered TiOx nanostructures on Au(111)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
2013 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 617, 211-217 p.Article in journal (Refereed) Published
Abstract [en]

The deposition of TiOx (x ≤ 2) structures on Au(111) by chemical vapor deposition (CVD) in ultrahigh vacuum (UHV) has been investigated with high-resolution core level photoelectron spectroscopy (PES), low-energy electron diffraction (LEED) and scanning tunnelingmicroscopy (STM). Using titanium tetra-isopropoxide as single source precursor it is possible to form different TiOx phases on the surface after deposition: at low coverages, we observe large two-dimensional (2D) honeycomb-lattice Ti2O3 islands with a (2 × 2) registry with the substrate. Higher coverages are dominated by the formation of three-dimensional (3D) TiO2 structures. The TiO2 structures are atomically well ordered provided that the deposition temperature is high enough (500 °C). The ordered structure exhibits a LEED pattern characteristic for a rectangular surface unit cell. By performing the deposition at different temperatures it is possible to tune the balance between the 2D and 3D phases: Growth at 500 °C significantly favors the formation of 3D TiO2 islands as compared to growth at 200 °C and 300 °C.

Place, publisher, year, edition, pages
2013. Vol. 617, 211-217 p.
National Category
Atom and Molecular Physics and Optics Materials Chemistry Condensed Matter Physics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
URN: urn:nbn:se:uu:diva-212702OAI: oai:DiVA.org:uu-212702DiVA: diva2:679025
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2014-06-30
In thesis
1. Titania Nanoscale Films and Surfaces: Surface Science Investigation of Structure and Properties
Open this publication in new window or tab >>Titania Nanoscale Films and Surfaces: Surface Science Investigation of Structure and Properties
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents surface science studies, investigating several aspects of titanium dioxide at the atomic scale. The greater part of this work is devoted to the preparation by chemical vapor deposition (CVD) of titanium(IV) tetraisopropoxide (TTIP) of ultrathin TiO2 or TiOx films on Au(111). Four ordered structures were growth and characterized. It was also demonstrated how the morphology of the film (wetting film vs island) can be tailored. The acquired knowledge about the CVD process was exploited to load nano porous gold with titania, enhancing its catalytic activity. The reactivity towards water adsorption of the titania structures on Au(111) was also investigated. Finally, part of this work concerned the studying of the behavior of water on the stoichiometric rutile TiO2(110) surface, combining the experiments with density-functional theory (DFT) calculations and (kinetic) Monte Carlo simulations. The main experimental techniques used in this work are low-energy electron diffraction (LEED), scanning tunneling microscopy (STM) and photoelectron spectroscopy (PES).

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 71 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1154
Photoelectron spectroscopy, PES, XPS, scanning tunneling microscopy, STM, titania, titanium oxide, TiO2, Au(111), gold, water, H2O, rutile
National Category
Atom and Molecular Physics and Optics Condensed Matter Physics
urn:nbn:se:uu:diva-224124 (URN)978-91-554-8969-4 (ISBN)
Public defence
2014-06-13, Polhemsalen 10134, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Available from: 2014-05-22 Created: 2014-05-05 Last updated: 2014-06-30

Open Access in DiVA

No full text

By organisation
Molecular and condensed matter physics
In the same journal
Surface Science
Atom and Molecular Physics and OpticsMaterials ChemistryCondensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 301 hits
ReferencesLink to record
Permanent link

Direct link