Self-organized nanostructures: an ESDIAD study of the striped oxidized Cu(110) surface

Mocuta, D.; Ahner, Joachim; Lee, Jae-Gook; Denev, S.; Yates, John T.

doi:10.1016/s0039-6028(99)00624-x

Cited by 7 publications

(6 citation statements)

References 28 publications

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“…Using 500 eV electron bombardment, followed by annealing to 300 K, we produced an oxide layer, forming the well-known one-dimensional suboxide chains. , Figure b shows the ESDIAD pattern observed after applying the procedure described above. The ESDIAD pattern is identical to that found for partially oxidized Cu(110). , Thus, we concluded that the ESDIAD pattern shown in Figure b is due to striped arrays of ···O−Ag−O−Ag−O··· chains oriented parallel to the <11̄0> azimuth as seen by STM 13,17 and discussed in detail elsewhere. This organized phase is termed suboxide, which implies a surface phase that may be the precursor to a thin film of oxide.…”

Section: Discussionsupporting

confidence: 76%

Electron-Stimulated Desorption Study of Oxygen Adsorbed on Ag(110). Observation of Inclined Physisorbed Species

2007

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Physisorbed molecular oxygen adsorbed on the Ag(110) surface was studied by temperature-programmed desorption (TPD) and time-of-flight electron-stimulated desorption ion angular distribution (TOF-ESDIAD). Oxygen molecules in the first physisorbed layer are tilted strongly from the surface normal and are oriented parallel to either the <001> or the <11 h0> azimuthal crystallographic directions of the Ag(110) surface, based on measurements of the trajectory of O + ions produced by electron impact. In the multilayer regime, oxygen molecules are mainly aligned parallel to the <001> azimuth with an O-O bond direction close to the surface normal. ESD cross sections for both O + ion formation and for O 2 desorption have been measured for the physisorbed species.

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Section: Discussionsupporting

confidence: 76%

Electron-Stimulated Desorption Study of Oxygen Adsorbed on Ag(110). Observation of Inclined Physisorbed Species

2007

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“…The chains start forming above 70 K but do not fully organize until ∼ 200 K 162 . They are formed from mobile chemisorbed O atoms and Cu adatoms which leave from step edges and diffuse across the terraces 138,162,[174][175][176][177][178] . The experimental barrier calculated for the formation of these strings, 0.22±0.01 eV 179 , is close to the DFT-calculated barriers for Cu (0.25 eV) and O (0.15 eV) diffusion 180 .…”

Section: Cu(110)mentioning

confidence: 99%

Atomistic details of oxide surfaces and surface oxidation: the example of copper and its oxides

Gattinoni

Michaelides

2015

Surface Science Reports

271

258

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The oxidation and corrosion of metals are fundamental problems in materials science and technology that have been studied using a large variety of experimental and computational techniques. Here we review some of the recent studies that have led to significant advances in our atomic-level understanding of copper oxide, one of the most studied and better understood metal oxides. We show that a good atomistic understanding of the physical characteristics of cuprous (Cu 2 O) and cupric (CuO) oxide and of some key processes of their formation has been obtained. Indeed, the growth of the oxide has been proven to be epitaxial with the surface and to proceed, in most cases, through the formation of oxide nano-islands which, with continuous oxygen exposure, grow and eventually coalesce. We also show how electronic structure calculations have become increasingly useful in helping to characterise the structures and energetics of various Cu oxide surfaces. However a number of challenges remain. For example, it is not clear under which conditions the oxidation of copper in air at room temperature (known as native oxidation) leads to the formation of a cuprous oxide film only, or also of a cupric overlayer. Moreover, the atomistic details of the nucleation of the oxide islands are still unknown. We close our review with a perspective on future work and discuss how recent advances in experimental techniques, bringing greater temporal and spatial resolution, along with improvements in the accuracy, realism and timescales achievable with computational approaches make it possible for these questions to be answered in the near future.

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“…Steps are assumed to be the source of Cu adatoms for the oxygen-chemisorption induced (2 × 1) phase formation. [20][21][22] Cu-O chain formation was the mechanism by which atomic oxygen was able to combine with Cu adatoms detaching from step edges and diffusing on the surface. Other experiments found that the ejection of Cu atoms from terraces was also a route for Cu adatom formation.…”

mentioning

confidence: 99%

Communication: Calculations of the (2 × 1)-O reconstruction kinetics on Cu(110)

Lian

Xiao

Liu

et al. 2017

The Journal of Chemical Physics

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Density functional theory calculations are used to study the elementary processes of the formation of the (2 × 1)-O reconstruction on the Cu(110) surface. The (2 × 1)-O reconstruction requires additional Cu atoms to form Cu–O rows on top of the surface. Both terrace and step sites are considered as the source of Cu adatoms. On terraces, adsorbed oxygen induces the ejection of Cu atoms to form –O–Cu–O– units, leaving Cu vacancies behind. The barrier for subsequent unit growth, however, is prohibitively high. Cu(110) step sites are also considered as a source of Cu atoms. Dissociated oxygen triggers the formation of stable Cu–O chains along the [001] step edges. This process, however, blocks the diffusion of Cu atoms so that it is not a viable mechanism for the (2 × 1)-O reconstruction. Oxygen adsorption on the [11¯0] edges also allows the nucleation of [001] oriented Cu–O rows. The short Cu–O rows act as diffusion channels for Cu atoms that detach from the step, which append to the end of the Cu–O chains. Our calculations of the formation of the (2 × 1)-O phase on Cu(110) provide a mechanistic description of the experimentally observed reconstruction.

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Self-organized nanostructures: an ESDIAD study of the striped oxidized Cu(110) surface

Cited by 7 publications

References 28 publications

Electron-Stimulated Desorption Study of Oxygen Adsorbed on Ag(110). Observation of Inclined Physisorbed Species

Electron-Stimulated Desorption Study of Oxygen Adsorbed on Ag(110). Observation of Inclined Physisorbed Species

Atomistic details of oxide surfaces and surface oxidation: the example of copper and its oxides

Communication: Calculations of the (2 × 1)-O reconstruction kinetics on Cu(110)

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