Highly ordered nanoscale surface alloy formed through Cr-induced Pt(111) reconstruction

Zhang, Lanping; Ek, J. van; Diebold, Ulrike

doi:10.1103/physrevb.57.r4285

Cited by 22 publications

(30 citation statements)

References 16 publications

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“…It can be described by (ͱ63 ϫͱ63)R19.1°or by a ( Ϫ4 5 9 4 ) superstructure cell, using the Wood or matrix notation, respectively. Very similar structures have been recently reported by Zhang et al 28 for Cr overlayers on Pt͑111͒ annealed to 800 K, which display in general similar bias dependence. They have been attributed to the formation of an ordered Cr/Pt surface alloy.…”

Section: Effect Of the Annealing On The V-oxide Morphology And Strsupporting

confidence: 89%

“…They have been attributed to the formation of an ordered Cr/Pt surface alloy. 28 It is likely that such an alloy formation also takes place between the V and Pd after annealing to 673 K. Our XPS results 8 have demonstrated that annealing of thicker ͑1.0-2.5 MLE͒ V-oxide films on Pd͑111͒ to 673 K leads to the appearance of a component in the V 2p 3/2 core-level spectra with a binding energy of 513.6 eV, which has been ascribed to a V/Pd alloy. Therefore, the temperature of 673 K marks the onset of the V-oxide decomposition.…”

Section: Effect Of the Annealing On The V-oxide Morphology And Strmentioning

confidence: 72%

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Growth and structure of ultrathin vanadium oxide layers on Pd(111)

et al. 2000

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The growth of thin vanadium oxide films on Pd͑111͒ prepared by reactive evaporation of vanadium in an oxygen atmosphere has been studied by scanning tunneling microscopy ͑STM͒, low-energy electron diffraction ͑LEED͒, and ab initio density-functional-theory ͑DFT͒ calculations. Two-dimensional ͑2D͒ oxide growth is observed at coverages below one-half of a monolayer ͑ML͒, displaying both random island and step-flow growth modes. Above the critical coverage of 0.5 ML, three-dimensional oxide island growth is initiated. The morphology of the low-coverage 2D oxide phase depends strongly on the oxide preparation conditions, as a result of the varying balance of the mobilities of adspecies on the substrate terraces and at the edges of the growing oxide islands. Under typical V oxide evaporation conditions of p(O 2)ϭ2ϫ10 Ϫ7 mbar, T͑substrate͒ ϭ523 K, the 2D oxide film exhibits a porous fractal-type network structure with atomic-scale ordered branches, showing a p(2ϫ2) honeycomb structure. Ab initio DFT total-energy calculations reveal that a surface oxide model with a formal V 2 O 3 stoichiometry is energetically the most stable configuration. The simulated STM images show a (2ϫ2) honeycomb structure in agreement with experimental observation. This surface-V 2 O 3 layer is very different from bulk V 2 O 3 and represents an interface stabilized oxide structure. The V oxide layers decompose on annealing above 673 K and 2D island structures of V/Pd surface alloy and metallic V are then formed on the Pd͑111͒ surface.

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Section: Effect Of the Annealing On The V-oxide Morphology And Strsupporting

confidence: 89%

Section: Effect Of the Annealing On The V-oxide Morphology And Strmentioning

confidence: 72%

Growth and structure of ultrathin vanadium oxide layers on Pd(111)

et al. 2000

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“…partly reminiscent of the Cr/Pt(111) pinwheel 43 and the VO x /Rh(111) 'wagon-wheel' 44 structures, though these are clearly different from the current case (pure metal and single oxide layers, respectively). In contrast to the first-layer CoO/Pt(111) moiré, the appearance of this second-layer structure does not significantly change with tunneling voltage.…”

Section: Multilayer Growthmentioning

confidence: 88%

Growth of ultrathin cobalt oxide films on Pt(111)

et al. 2011

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Cobalt surface oxides where grown on Pt(111) by depositing Co and dosing with molecular oxygen at temperatures ranging between 300 K and 740 K. Oxidation of 1 monolayer (ML) Co results in a two-dimensional (2D) moiré structure, observed both using low energy electron diffraction and scanning tunneling microscopy, and interpreted as a polar (oxygen terminated) CoO(111) atomic bilayer. With respect to bulk CoO, it is expanded by 2.7±0.5% in the surface plane. An almost flawless moiré pattern is obtained after a final step of annealing at 740 K in oxygen. Insufficient oxidation leads to defects in the moiré pattern, consisting of triangular dislocation loops of different sizes; the smaller ones occupying one half of the moiré cell. Low-temperature annealing (450 K) can be used to create a zigzag phase, which is mainly observed in 1-ML thick areas after several cycles of Co deposition (1 ML each) and oxidation at 10 -7 mbar. The CoO films obtained by deposition/oxidation cycles exhibit Stranski-Krastanov growth; the structure of the 2D layer in between the islands depending on the thermal treatment. After annealing at 740 K it exhibits the moiré pattern, while the zigzag phase was observed after low-temperature annealing. The second monolayer consists of a moiré pattern different from that of the 1st layer, presumably a wurtzite-like structure. Above the 3rd layer, we observe only small 3D islands, which exhibit a band gap. We have also studied oxidation of surface alloys obtained by depositing Co and annealing. On these surfaces, we found a quasi-(3×3) reconstruction. Structure models are presented for all phases observed, and we argue that some of the moiré-like structures might be useful as templates for metal cluster growth.

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“…This particular reconstruction is found for example with Cr/Pt(1 1 1) [57,58] and Ce/Pt(1 1 1) [59,60] and also for various oxide films (see below). Another example of temperature control of the pattern is found in the case of Ti on W(100) where a square nanomesh with a lattice constant of 4.5 nm can be produced by annealing at 1370 K [61].…”

Section: Epitaxial Metal Filmsmentioning

confidence: 88%

Surfaces: Two-Dimensional Templates

Becker

Wandelt

2008

Topics in Current Chemistry

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Producing nanoscale structures on solid surfaces in a controlled way is a technologicalchallenge that has an important impact on a variety of fields such as microelectronics, magnetic storagetechnology, and heterogeneous catalysis. Currently most processes are based on a top-down approach,which relies on an active patterning of a surface by, for example, lithography or imprinting. As thedesired structures become smaller these top-down processes will reach the physical limit of their resolution.A bottom-up approach, which is based on a template-controlled growth of nanostructures on a prestructuredsubstrate, can provide access to structural dimensions of only a few nanometers. The challenge forthe growth of such nanostructures on surfaces is to identify and design suitable surfaces, which act astemplates due to their intrinsic physical and chemical properties. These 2-dimensional (2D) templates canthen be utilized to produce nanostructures of metals, semiconductors, or organic compounds.

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Highly ordered nanoscale surface alloy formed through Cr-induced Pt(111) reconstruction

Cited by 22 publications

References 16 publications

Growth and structure of ultrathin vanadium oxide layers on Pd(111)

Growth and structure of ultrathin vanadium oxide layers on Pd(111)

Growth of ultrathin cobalt oxide films on Pt(111)

Surfaces: Two-Dimensional Templates

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