Ag growth on N-modified Cu(111) surfaces: potential three-dimensional quantum confinement structures

York, Scott; Jenkins, Carol; Silva, S.L.; Leibsle, F.M.

doi:10.1016/s0039-6028(00)00753-6

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…Such a configuration can be simply understood by considering that Au(111) has substantially a lower surface energy (SE) than Cu(111) (1.50 vs 1.83 J/m 2 ). − Therefore, the bimetal system tends to expose the Au layer to gain a lower energy. Such a rule also fits with the fact of growing Cu films on Ag(111) (SE ≈ 1.25 J/m 2 ) and Pt(111) (SE ≈ 2.48 J/m 2 ), which forms Ag-top/Cu-sub − and Cu-top/Pt-sub structures, − respectively.…”

Section: Resultssupporting

confidence: 74%

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Comparison Study of Structural Properties and CO Adsorption on the Cu/Au(111) and Au/Cu(111) Thin Films

et al. 2018

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Supported metal films are often found to display extraordinary properties compared to their bulk counterparts. In this work, we investigate the atomic and electronic structures of both the Au/Cu(111) and Cu/ Au(111) thin films with low-temperature scanning tunneling microscopy (STM) and synchrotron radiation photoelectron spectroscopy (SRPES). The high-resolution STM images revealed that the Au films evaporated on Cu(111) at room temperature grow with compressed lattices, which gradually evolve and restore to that of the bulk gold from the fourth layer. Both STM and SRPES evidenced that there are considerable Cu atoms incorporated into each layer of the Au films, whose concentrations decrease stepwise along with the film thickening. As a reversed system, the growth of Cu films on Au(111) starts with agglomerating at the subsurface and adopting a (1 × 1) lattice within a submonolayer coverage. The lattice quickly shrinks to that of bulk Cu(111) from the second layer, yet the electronic property is restored slowly until the third layer. In each Cu film, there were also intermixed Au atoms coming from the substrate, and their concentrations also decrease along with the film thickening. On both the Au/Cu(111) and Cu/Au(111) submonolayer films, CO adsorption was investigated and found to be significantly higher than bare Au(111) but still weaker than the Cu(111) surface. The adsorbed CO molecules were apparently connected to the incorporated Cu atoms in the surface layers, yet the enhanced CO bindings were closely related to the electronic properties of the films. These findings are believed to shed new light on the atomic details of the Cu/Au bimetallic systems, thus deepening the understanding of the specific catalytic activities of the Cu/ Au alloys.

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Section: Resultssupporting

confidence: 74%

“…Previous studies of the Ag film on Cu(111) − reported a (9 × 9) superstructure with similar triangular features. In that case, the superlattice was deduced from overlapping the Ag(111) lattice (0.288 nm) with the Cu(111) substrate.…”

Section: Resultsmentioning

confidence: 63%

Comparison Study of Structural Properties and CO Adsorption on the Cu/Au(111) and Au/Cu(111) Thin Films

et al. 2018

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“…Most importantly, however, addition of the second Ag monolayer resulted in the breakdown of covalent binding, between both Ag layers and the Cu slab (see pDOS lack of Ag/Cu t 1u populations in Figure 1b).It was, thus, concluded that while surface growth of a single Ag monolayer is feasible, growth of consecutive monolayers is not a possibility. It has to be noted that this finding is in some contrast with the experimentally observed growth of up to four atomic layers of Ag (111) on Cu (111) [27].…”

Section: Surface Growth Of Ag Monolayerscontrasting

confidence: 75%

“…The current work was motivated by the facility to create three-dimensional quantum confinement structures by restricting epitaxial growth of a quantum-well material to nanometer-scale regions (e.g., [27]) and reports on the possibility of surface growth, inter-diffusion, and alloying of Ag (001) monolayers on Cu (001) from the standpoint of DFT total formation energy.…”

Section: Open Accessmentioning

confidence: 99%

Surface Growth and Diffusion Energetics of Ag Monolayers on Cu (001)

Antipas

2014

Metals

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Abstract:The growth of Ag monolayers on Cu (001) was studied by periodic Density Functional Theory (DFT). Despite the limited solid solubility of Ag in Cu, the growth of a single Ag overlayer on Cu (001) was predicted as feasible. In contrast, the growth of consecutive Ag monolayers was found to be energetically forbidden. Inter-diffusion of Ag monolayers into Cu was raised as a possibility but it was dependent on the sequence in which the Ag monolayers were introduced into the Cu bulk. The Ag layers preferred to be kept neither too far apart nor too close to each other, the optimum spacing between two Ag monolayers determined to be that of two consecutive Cu layers. Ag diffusion mediated tensile stress in the Cu cell by causing an increase of the unit cell constant by as much as 22%. Interactions between the Ag and Cu species also involved a degree of covalency. In general, progression of a surface Ag monolayer into the Cu bulk involved charge depletion over the Ag species and a simultaneous charge concentration over neighboring Cu atoms; this mechanism was found to influence Cu up to a depth of four surface layers.

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Nanostructure fabrication on copper surfaces

Leibsle¹

2002

Surface Science

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Ag growth on N-modified Cu(111) surfaces: potential three-dimensional quantum confinement structures

Cited by 4 publications

References 17 publications

Comparison Study of Structural Properties and CO Adsorption on the Cu/Au(111) and Au/Cu(111) Thin Films

Comparison Study of Structural Properties and CO Adsorption on the Cu/Au(111) and Au/Cu(111) Thin Films

Surface Growth and Diffusion Energetics of Ag Monolayers on Cu (001)

Nanostructure fabrication on copper surfaces

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