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Controlled modification of nanoporous gold: Chemical vapor deposition of TiO2 in ultrahigh vacuum
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2013 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 282, 439-443 p.Article in journal (Refereed) Published
Abstract [en]

TiO2 has been deposited in the first 400 nm of a nanoporous gold (NPG) structure using metal organic chemical vapor deposition with titanium-tetraisopropoxide as single source precursor in ultra high vacuum. The NPG has been pretreated by ozone to clean and stabilize the structure for deposition. The deposited oxide stabilizes the porous structure, otherwise prone to coarsening at elevated temperatures, up to 300 degrees C. The study combines the controlled sample preparation with a functional test of the prepared catalyst under real conditions in a continuous gas flow reactor. The catalytic activity of the loaded NPG at 60 degrees C for CO oxidation is found to be superior to unloaded as-prepared NPG.

Place, publisher, year, edition, pages
2013. Vol. 282, 439-443 p.
Keyword [en]
Nanoporous gold, Titania, Chemical vapor deposition, Heterogeneous catalysis, Ultrahigh vacuum
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-206545DOI: 10.1016/j.apsusc.2013.05.148ISI: 000322314800064OAI: oai:DiVA.org:uu-206545DiVA: diva2:644738
Available from: 2013-09-02 Created: 2013-09-02 Last updated: 2017-12-06Bibliographically approved
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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1154
Keyword
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
Identifiers
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)
Opponent
Supervisors
Available from: 2014-05-22 Created: 2014-05-05 Last updated: 2014-06-30

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Ragazzon, DavideSandell, Anders

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