Mosaic and facet structures of epitaxial MnO films on Au (110)

Meinel, K.; Huth, Michael; Beyer, H.; Neddermeyer, H.; Widdra, W.

doi:10.1016/j.susc.2013.08.021

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…The probably most comprehensive study was undertaken on Pd(100) supports. , Here, a whole bunch of thin-film configurations were observed as a function of the oxidation conditions, including a Mn 3 O 4 vacancy structure, rocksalt MnO, and O–Mn–O trilayers. Epitaxial MnO(100) films were produced by reactive Mn deposition onto Ag(100), , while formation of strongly faceted MnO(110) was revealed on Au(110) . In other studies, the oxide growth involved spontaneous symmetry breaking, and hexagonal Mn–O structures were stabilized on square Pd(100) and Rh(100) supports. , Also the reverse effect, i.e., growth of square-lattice MnO on hexagonal Pt(111), was reported .…”

Section: Introductionmentioning

confidence: 92%

“…Epitaxial MnO(100) films were produced by reactive Mn deposition onto Ag(100), 16,17 while formation of strongly faceted MnO(110) was revealed on Au(110). 18 In other studies, the oxide growth involved spontaneous symmetry breaking, and hexagonal Mn− O structures were stabilized on square Pd(100) and Rh(100) supports. 19,20 Also the reverse effect, i.e., growth of square-lattice MnO on hexagonal Pt(111), was reported.…”

Section: Introductionmentioning

confidence: 93%

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Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn₃O₄

et al. 2018

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The growth of manganese oxide on a Au(111) support has been examined over a wide range of preparation conditions and film thicknesses by means of scanning tunneling microscopy (STM), electron diffraction, and photoelectron spectroscopy. Two oxide polymorphs were found to coexist on the gold surface. Whereas MnO-type structures prevail at oxygenlean preparation conditions, annealing in oxygen gives Hausmannite Mn 3 O 4 as the dominant phase. Both polymorphs adopt square structures that only permit row-matched growth on the hexagonal gold, explaining the high tendency for oxide dewetting at elevated temperature. The manganese oxide films are thus polycrystalline and consist of a large number of submicrometer grains with different orientations and surface terminations. A variety of square and line patterns were identified on top of the oxide crystallites, all of them being compatible with either the primitive 5.8 × 5.8 Å 2 cell of Mn 3 O 4 (001) or an ordered MnO(100) vacancy structure. STM conductance spectroscopy provides insight into the electronic properties of the Mn−O islands and yields the approximate size of the band gap as well as the energy position of localized Mn 3d levels in the gap region. Our work illuminates the structural and electronic properties of manganese oxide films grown on Au(111) and therefore complements earlier studies performed on Pt(111), Pd(100), and Ag(100) supports.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 93%

Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn₃O₄

et al. 2018

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“…Such considerations drive faceting on open metal surfaces [28][29][30], where the exposure of close-packed surfaces is energetically favourable. On metal oxides, faceting has been observed for rocksalt compounds such as NiO(100) [31] and MnO [32], and attributed to a strong preference for the non-polar (100) surface [33]. Such logic cannot be applied to Fe3O4(110), because the unreconstructed Fe3O4(110) and Fe3O4(111) surfaces are both polar.…”

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confidence: 99%

Fe3O4(110)–(1 × 3) revisited: Periodic (111) nanofacets

et al. 2016

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The structure of the Fe3O4(110)-(1×3) surface was studied with scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and reflection high energy electron diffraction (RHEED). The so-called one-dimensional reconstruction is characterised by bright rows that extend hundreds of nanometers in the [1 � 10] direction and have a periodicity of 2.52 nm in [001] in STM. It is concluded that this reconstruction is the result of a periodic faceting to expose {111}-type planes with a lower surface energy. Main TextMagnetite (Fe3O4) is a common material in the Earth's crust and plays an important role in geochemistry and corrosion [1; 2]. At room temperature Fe3O4 crystallizes in the inverse-spinel structure, and Fe cations occupy tetrahedrally (Fetet) and octahedrally (Feoct) coordinated interstices within a face-centred cubic lattice of O 2anions. Natural single crystals are typically octahedrally shaped and expose {111} facets, consistent with density functional theory (DFT)-based calculations that find (111) to be the most stable low-index surface [3; 4]. In recent years however, advances in synthesis have allowed the size and shape of Fe3O4 nanomaterial to be tailored with a view to enhancing performance in applications such as groundwater remediation, biomedicine, and heterogeneous catalysis [1; 5], and nanocubes and nanorods exposing {100} surfaces have been reported [6; 7]. To date, there have been no reports of Fe3O4 nanomaterial exhibiting {110} surfaces.

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“…Although germanene on Sb(111) substrate is close to its free-standing form in DFT calculations, we only obtain monolayer Ge sheet consisting of mosaic germanene 1×1 domains, instead of a complete 1×1 germanene sheet on Sb(111) by MBE growth, as shown in STM images (figure 2). The most possible reason is the large mismatch between the lattices of Sb(111) (4.3 Å) and germanene (3.97 Å) [33,34]. To address this question, we further performed the DFT calculations on germanene nanoribbon and island on Sb(111).…”

Section: Resultsmentioning

confidence: 99%

Strained monolayer germanene with 1 × 1 lattice on Sb(111)

et al. 2016

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Monolayer germanene, the germanium analog of graphene, has been successfully synthesized on Sb(111) surface via molecular beam epitaxy. Scanning tunneling microscopy revealed a dendrite structure at low Ge coverage and mosaic patterns at high coverage, both with local 1×1 lattice. Firstprinciple calculations confirmed the 1×1 low-buckled structure of germanene. The dendrite and mosaic patterns stem from strain modulation induced by large lattice mismatch between germanene and Sb substrate. This work provide a new system to explore the physical properties and applications of germanene.

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Mosaic and facet structures of epitaxial MnO films on Au (110)

Cited by 6 publications

References 26 publications

Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn₃O₄

Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn₃O₄

Fe3O4(110)–(1 × 3) revisited: Periodic (111) nanofacets

Strained monolayer germanene with 1 × 1 lattice on Sb(111)

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Mosaic and facet structures of epitaxial MnO films on Au (110)

Cited by 6 publications

References 26 publications

Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn3O4

Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn3O4

Fe3O4(110)–(1 × 3) revisited: Periodic (111) nanofacets

Strained monolayer germanene with 1 × 1 lattice on Sb(111)

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Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn₃O₄

Manganese Oxide Thin Films on Au(111): Growth Competition between MnO and Mn₃O₄