Ordered Overlayers of Ca on TiO<sub>2</sub>(110)-1×1

Bikondoa, Oier; Pang, Chi L.; Muryn, C. A.; Daniels, Benjamin G.; Ferrero, Stefano; Michelangeli, Ela; Thornton, G.

doi:10.1021/jp048143l

Cited by 16 publications

(69 citation statements)

References 13 publications

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“…The experimental data suggest that K also occupies a three-fold coordinated site in which K bonds to two bridging O atoms and one in-plane O atom. A similar three-fold hollow site seems plausible for Caadsorption on TiO 2 (110) surface [277]. Ab initio calculations and molecular dynamics (MD) simulations further confirmed that the preferred adsorption positions for alkalies on TiO 2 (110) are the three-fold O coordination sites.…”

Section: Tio 2 Surfacesmentioning

confidence: 67%

“…It is also consistent with the large adsorption energy and small diffusion length which are expected for the highly reactive metals on the stoichiometric TiO 2 surface. Thornton and coworkers have systematically studied the adsorption of Na [274], K [276], and Ca [277] on TiO 2 (110) surfaces with scanning probe microscopy (SPM). The metal-induced surface structures are observed to distribute evenly on the surfaces.…”

Section: Tio 2 Surfacesmentioning

confidence: 99%

See 1 more Smart Citation

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

722

651

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Section: Tio 2 Surfacesmentioning

confidence: 67%

Section: Tio 2 Surfacesmentioning

confidence: 99%

Interaction of nanostructured metal overlayers with oxide surfaces

Wagner

2007

Surface Science Reports

722

651

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“…While there are many more investigations of monolayer oxides on the rutile TiO 2 (110) surface, very few similarly well-ordered oxide 22,23 have been reported for that surface orientation. We consider that the less stable (011) surface that exhibits a 2 Â 1 surface reconstruction may facilitate the formation of ordered mixed oxide surfaces.…”

Section: Discussionmentioning

confidence: 99%

Ordered Fe(II)Ti(IV)O₃ Mixed Monolayer Oxide on Rutile TiO₂(011)

et al. 2015

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Oxide monolayers supported or intermixed with an oxide support are potential nanocatalysts whose properties are determined by the interplay with the support. For fundamental studies of monolayer oxides on metal oxide supports, well-defined systems are needed, but so far, the synthesis of monolayer oxides with long-range order on single-crystal oxide surfaces is rare. Here, we show by a combination of scanning tunneling microscopy, photoemission spectroscopy, and density functional theory (DFT)-based computational analysis that the rutile TiO2(011) surface supports the formation of an ordered mixed FeTiO3 monolayer. Deposition of iron in a slightly oxidizing atmosphere (10(-8) Torr O2) and annealing to 300 °C results in a well-ordered surface structure with Fe in a 2+ charge state and Ti in a 4+ charge states. Low-energy ion scattering suggests that the cation surface composition is close to half Fe and half Ti. This surface is stable in ultrahigh vacuum to annealing temperatures of 300 °C before the iron is reduced. DFT simulations confirm that a surface structure with coverage of 50% FeO units is stable and forms an ordered structure. Although distinct from known bulk phases of the iron-titanium oxide systems, the FeTiO3 monolayer exhibits some resemblance to the ilmenite structure, which may suggest that a variety of different mixed oxide phases (of systems that exist in a bulk ilmenite phase) may be synthesized in this way on the rutile TiO2(011) substrate.

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“…Such segregated impurities can give rise to rather well-ordered overlayer structures with flat surfaces [51,52]. The structure of Ca-segregated rutile (1 1 0) has been investigated by several groups [53][54][55][56].…”

Section: Segregation Of Impuritiesmentioning

confidence: 99%