The growth and structure of titanium oxide films on Pt(111) investigated by LEED, XPS, ISS, and STM

Boffa, A. B.; Galloway, Heather C.; Jacobs, Peter W.; Benı́tez, José J.; Batteas, James D.; Salmerón, Miquel; Bell, Alexis T.; Somorjai, Gábor A.

doi:10.1016/0039-6028(94)00760-8

Cited by 119 publications

(77 citation statements)

References 26 publications

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“…7.9. Another result by Kern, et al [8] on the Cu(ll0)-(2xl)O surface is similar to this work in that an ordered array of elongated islands is observed. However, the islands form in the opposite direction and are elongated in the [Ool] direction and consist of eight to fourteen 0-Cu-0 rows.…”

Section: Discussion Of Island/trough Structuresupporting

confidence: 89%

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Thin films of metal oxides on metal single crystals: Structure and growth by scanning tunneling microscopy

Galloway

1995

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Section: Discussion Of Island/trough Structuresupporting

confidence: 89%

“…As a result of the interest in the model catalytic systems, it was discovered by Boffa, et al [8] that TiO, on Pt(ll1) forms ordered structures. At higher temperatures than those used to prepare the catalytic system (500-700 C as opposed to 300-400 C) a variety of ordered LEED patterns are observed on the crystal.…”

Section: Discussionmentioning

confidence: 99%

Thin films of metal oxides on metal single crystals: Structure and growth by scanning tunneling microscopy

Galloway

1995

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“…The oxidation state of the Ti in the ordered (8 · 2) film is 3+ deduced from the observed narrow Ti-O phonon at 84 meV in HREELS [6,39] and the Ti 2p binding energy of 455.7 eV in XPS [31]. Similar reduced TiO x films have also been grown on Pt(111) [40] and Pt(100) [41]. The Mo(112)-TiO x film has a full monolayer of reduced Ti sites, thus strong bonding between Au metal atoms and Ti is expected.…”

Section: Au On Tio X /Mo(112)mentioning

confidence: 96%

Interaction of Au with titania: the role of reduced Ti

Chen

Goodman

2007

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The interaction of Au with oxide supports has been found to play a vital role in determining the unique properties of Au catalysts. In this study, the binding of Au with titania was investigated using scanning tunneling microscopy (STM) and ultra-violet photoemission spectroscopy (UPS). Two support systems, rutile TiO 2 (110) and an ordered TiO x /Mo(112) thin film were used. On a highly defective TiO 2 (110) surface, Au particles were found to bind first on the oxygen vacancy sites. Complete wetting of the oxide by Au was found on an ordered and reduced Ti 3+ O x /Mo(112) film to form two ordered structures, a (1 · 1)-monolayer and a (1 · 3)-Au/TiO x /Mo(112) bi-layer. Detailed STM images confirm the proposed structural models. Reduced titania was found to enhance the binding of Au with Ti sites and promote electron donation from Ti d+ to Au, leading to electron-rich Au and to enhanced CO bonding.

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“…Plasma assisted MBE was used for oxides of Mg, Ni, Co, Ti, Ru, Mn, V, Al, Cr, Zr, Ce and Fe, as revieved recently [154]. A further technique is metal deposition and subsequent oxidation, which was applied to oxides of Ti [155,156], Ce [157], as well as Fe as presented in this work. Ordered Feoxide films were prepared in this way by Vurens et al for the first time onto Pt(111) [158,159] and Pt(100) [160] substrates.…”

Section: Preparation Of Ordered Metal-oxide Surfacesmentioning

confidence: 99%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

581

610

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Metal-oxide based catalysts are used for many important synthesis reactions in the chemical industry. A better understanding of the catalyst operation can be achieved by studying elemantary reaction steps on well-defined model catalyst systems. For the dehydrogenation of ethylbenzene to styrene in the presence of steam both unpromoted and potassium promoted iron-oxide catalysts are active. Here we review the work done over unpromoted single-crystalline FeO(111), Fe 3 O 4 (111) and α-Fe 2 O 3 (0001) films grown epitaxially on Pt(111) substrates. Their geometric and electronic surface structures were characterized by STM, LEED, electron microscopy and electron spectroscopic techniques. In an integrative approach, the interaction of water, ethylbenzene and styrene with these films was investigated mainly by thermal desorption and photoelectron emission spectroscopy. The adsorptiondesorption energetics and kinetics depend on the oxide surface terminations and are correlated to the electronic structures and acid-base properties of the corresponding oxide phases, which reveal insight into the nature of the active sites and into the catalytic function of semiconducting oxides in general. Catalytic studies, using a batch reactor arrangement at high gas pressures and post reaction surface analysis, showed that only α-Fe 2 O 3 (0001) containing surface defects is catalytically active, whereas Fe 3 O 4 (111) is always inactive. This can be related to the elementary adsorption and desorption properties observed in ultrahigh vacuum, which indicates that the surface chemical properties of the iron-oxide films do not change significantly across the "pressure-gap". A model is proposed according to which the active site involves a regular acidic surface sites and a defect site next to it. The results on metal-oxide surface chemistry also have implications for other fields, such as environmental science, biophysics and chemical sensors.-2 -"2kyEi9FYSQjBVrZxIPQ.FHIAC_WRa02_review.doc", Datum: 19.02.03

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The growth and structure of titanium oxide films on Pt(111) investigated by LEED, XPS, ISS, and STM

Cited by 119 publications

References 26 publications

Thin films of metal oxides on metal single crystals: Structure and growth by scanning tunneling microscopy

Thin films of metal oxides on metal single crystals: Structure and growth by scanning tunneling microscopy

Interaction of Au with titania: the role of reduced Ti

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

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