Ultra-thin MgO(111)-polar sheets grown onto Ag(111)

Sarpi, Brice; Daineche, Rachid; Girardeaux, Christophe; Hémeryck, Anne; Vizzini, Sébastien

doi:10.1016/j.apsusc.2015.11.176

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…To identify the Room Temperature (RT) growth mode followed by Mg onto Ag(111), a growth curve highlighting the variation of the silver main peak Auger intensity under the influence of Mg deposition was recorded 22 . From the shape of such a curve, the growth mode can be deduced.…”

Section: Experimental Results: Scanning Tunneling Microscopy and Augementioning

confidence: 99%

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A perfect wetting of Mg monolayer on Ag(111) under atomic scale investigation: First principles calculations, scanning tunneling microscopy, and Auger spectroscopy

Migaou

Sarpi

Guiltat

et al. 2016

The Journal of Chemical Physics

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First principles calculations, scanning tunneling microscopy, and Auger spectroscopy experiments of the adsorption of Mg on Ag(111) substrate are conducted. This detailed study reveals that an atomic scale controlled deposition of a metallic Mg monolayer perfectly wets the silver substrate without any alloy formation at the interface at room temperature. A liquid-like behavior of the Mg species on the Ag substrate is highlighted as no dot formation is observed when coverage increases. Finally a layer-by-layer growth mode of Mg on Ag(111) can be predicted, thanks to density functional theory calculations as observed experimentally.

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Section: Experimental Results: Scanning Tunneling Microscopy and Augementioning

confidence: 99%

“…For these applications, the integration of this MgO oxide requires very good quality of interface to ensure enhanced performances. Nevertheless, many studies highlight that the MgO/Ag interfaces and more particularly the interfacial area is highly dependent of the deposition process [22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

A perfect wetting of Mg monolayer on Ag(111) under atomic scale investigation: First principles calculations, scanning tunneling microscopy, and Auger spectroscopy

Migaou

Sarpi

Guiltat

et al. 2016

The Journal of Chemical Physics

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“…[10] Thepolar MgO(111) surface with intrinsic perpendicular electrostatic field is proposed to have unique catalytic properties, [11] but remains challenging to prepare due to its thermodynamic instability and high surface energy. [12] Apart from physical or chemical evaporation-deposition methods that produces thin films under ultrahigh vacuum, [13] synthetic methods to prepare MgO(111) as af ree standing solid are limited and lead to polycrystalline nanosheets or octahedral microcrystals. [14] In addition, on such an unstable polar surface,v alence compensation (reconstruction, new electron state or adsorption of foreign species) has been proposed and experimentally observed, [15] making the surface chemistry of MgO(111) quite complex.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Single Crystalline MgO(111) Nanosheets**

et al. 2020

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Synthesizing high-quality two-dimensional nanomaterials of non-layered metal oxide is a grand challenge because it requires long range single-crystallinity and clean high-energy surfaces. Here, we report the synthesis of single-crystalline MgO(111) nanosheets via a twostep process involving the formation of ultrathin Mg(OH)2 nanosheets as precursor and their selective topotactic conversion upon heating under dynamic vacuum. The defect-rich surface displays terminal-OH groups, 3-coordinated O 2sites, low-coordinated Mg 2+ sites as well as single electrons trapped at oxygen vacancies, that render MgO nanosheets highly reactive as evidenced by the activation of CO molecules at low temperatures and pressures, with formation of strongly adsorbed red-shifted CO and coupling of CO molecules into C2 species.

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“…In a previous work, our group has studied the spontaneous and self-limited formation of an ultra-thin Mg2Si layer (70 pm thick) in the early stages of Mg deposition (0.25 ML) on Ag(111) [15] and Si(100) at RT [1]. Used as a growth template for MgO atomic films, we have then reported the RT crystallization of this interfacial Mg2Si driven by its partial decomposition under oxygen exposure [16].…”

Section: Introductionmentioning

confidence: 99%

Growth, stability and decomposition of Mg2Si ultra-thin films on Si (100)

Sarpi

Zirmi

Putero

et al. 2018

Applied Surface Science

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International audienceUsing Auger Electron Spectroscopy (AES), Scanning Tunneling Microscopy/Spectroscopy (STM/STS) and Low Energy Electron Diffraction (LEED), we report an in-situ study of amorphous magnesium silicide (Mg2Si) ultra-thin films grown by thermally enhanced solid-phase reaction of few Mg monolayers deposited at room temperature (RT) on a Si(100) surface. Silicidation of magnesium films can be achieved in the nanometric thickness range with high chemical purity and a high thermal stability after annealing at 150 °C, before reaching a regime of magnesium desorption for temperatures higher than 350 °C. The thermally enhanced reaction of one Mg monolayer (ML) results in the appearance of Mg2Si nanometric crystallites leaving the silicon surface partially uncovered. For thicker Mg deposition nevertheless, continuous 2D silicide films are formed with a volcano shape surface topography characteristic up to 4 Mg MLs. Due to high reactivity between magnesium and oxygen species, the thermal oxidation process in which a thin Mg2Si film is fully decomposed (0.75 eV band gap) into a magnesium oxide layer (6–8 eV band gap) is also reported

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Ultra-thin MgO(111)-polar sheets grown onto Ag(111)

Cited by 9 publications

References 25 publications

A perfect wetting of Mg monolayer on Ag(111) under atomic scale investigation: First principles calculations, scanning tunneling microscopy, and Auger spectroscopy

A perfect wetting of Mg monolayer on Ag(111) under atomic scale investigation: First principles calculations, scanning tunneling microscopy, and Auger spectroscopy

Ultrathin Single Crystalline MgO(111) Nanosheets**

Growth, stability and decomposition of Mg2Si ultra-thin films on Si (100)

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