Evidence for 2D-Network Structure of Monolayer Silica Film on Mo(112)

Seifert, J.; Blauth, D.; Winter, H.

doi:10.1103/physrevlett.103.017601

Cited by 30 publications

(23 citation statements)

References 24 publications

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“…From the resulting "triangulation curves" atomic positions of ultrathin metal and oxide films were derived [8,68]. Later, this principle was optimized by the detection of electron number distributions [9,44,[69][70][71], which is discussed below. First, we describe the latest development for the derivation of triangulation curves on the basis of two-dimensional intensity distributions of scattered helium projectiles.…”

Section: B Triangulation Methodsmentioning

confidence: 99%

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

Seifert

Winter

2016

Phys. Rev. B

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We present an extensive study on the structure of oxygen adsorbates on Mo(112) by means of grazing scattering of fast hydrogen and helium atoms and low-energy electron diffraction. For projectile energies less than 2 keV, fast atom diffraction provides information on the surface unit cell and on adsorption sites for low coverages. In the classical scattering regime, we employed so-called triangulation techniques where for an azimuthal rotation of the target axial surface channels are identified. From comparison with computer simulation positions of surface atoms can be derived. Aside from the detection scheme of projectile-induced electron emission, we present details for a new variant of triangulation based on the detection of angular distributions of scattered particles. The different sensitivity of the methods to the topmost surface layers allows us to efficiently set up structural models for four adsorbate phases for which contradicting models exist in literature. The c(4×2) phase is revealed to be one step in the formation of a missing-row reconstruction with p(1×2) unit cell. Our studies demonstrate the potential of grazing scattering of fast atoms for quantitative structure analysis.

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Section: B Triangulation Methodsmentioning

confidence: 99%

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

Seifert

Winter

2016

Phys. Rev. B

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“…[19][20][21][22] In extensive studies on the properties of this system, the detailed geometric structure could be unequivocally cleared up, after a controversial discussion of two conflicting structural models in literature over the last years. 17,[23][24][25][26][27][28][29][30][31][32][33][34][35] By virtue of the interferometric nature, FAD interference patterns show a pronounced sensitivity on the projectilesurface interaction potential which sensitively depend on the positions of surface atoms. Here we present a detailed investigation on the effective interaction potential for He atoms in front of a silica film on Mo͑112͒.…”

Section: Introductionmentioning

confidence: 98%

Diffraction of fast atoms during grazing scattering from the surface of an ultrathin silica film on Mo(112)

et al. 2010

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He atoms and H 2 molecules with energies of 2 keV are scattered under grazing angles of incidence ranging from 0.2°to 1.8°from the surface of a monolayer silica film grown on a Mo͑112͒. We observe for scattering along low indexed atomic strings in the topmost surface layer pronounced diffraction pattern owing to diffraction effects for the elastically scattered projectiles. The diffraction patterns are analyzed in terms of semiclassical trajectory calculations making use of interaction potentials derived from density-functional theory. We find good agreement with the experiments, for a two-dimensional ͓Si-O-Si͔ network structural model for the ultrathin silica film.

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“…Besides this, silicene-oxygen interaction leads to new two-dimensional(2D) silica crystals in different forms [5,6] and bilayer structures [11]. Recently, efforts have been devoted to grow 2D ultrathin polymorphs of silica on substrates [6,[11][12][13][14] and theoretical studies have been also carried out to understand 2D silica and their defects [9,15,16]. In various 3D fourfold coordinated allotropes of SiO 2 , such as amorphous and crystalline quartz, which are commonly named as silica, Si-O-Si bonds are bent around oxygen atoms [17], except for β-cristobalite which has straight Si-O-Si bonds [18].…”

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confidence: 99%

Stable Single-Layer Honeycomblike Structure of Silica

2014

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Silica or SiO2, the main constituent of earth's rocks has several 3D complex crystalline and amorphous phases, but it does not have a graphite like layered structure in 3D. Our theoretical analysis and numerical calculations from the first-principles predict a single-layer honeycomb like allotrope, hα-silica, which can be viewed to be derived from the oxidation of silicene and it has intriguing atomic structure with re-entrant bond angles in hexagons. It is a wide band gap semiconductor, which attains remarkable electromechanical properties showing geometrical changes under external electric field. In particular, it is an auxetic metamaterial with negative Poisson's ratio and has a high piezoelectric coefficient. While it can form stable bilayer and multilayer structures, its nanoribbons can show metallic or semiconducting behavior depending on their chirality. Coverage of dangling Si orbitals by foreign adatoms can attribute new functionalities to hα-silica. In particular, Si2O5, where Si atoms are saturated by oxygen atoms from top and bottom sides alternatingly can undergo a structural transformation to make silicatene, another stable, single layer structure of silica.

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Evidence for 2D-Network Structure of Monolayer Silica Film on Mo(112)

Cited by 30 publications

References 24 publications

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

Diffraction of fast atoms during grazing scattering from the surface of an ultrathin silica film on Mo(112)

Stable Single-Layer Honeycomblike Structure of Silica

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