Au(111) films on W(110) studied by STM and LEED – Uniaxial reconstruction, dislocations and Ag nanostructures

Giela, Tomasz; Freindl, K.; Spiridis, N.; Korecki, J.

doi:10.1016/j.apsusc.2014.04.104

Cited by 9 publications

(5 citation statements)

References 29 publications

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“…The superstructure can be identified as a reshaped herringbone (22 √ 3) reconstruction. Interestingly, we observe the dislocations more ordered than in earlier STM works [27]. Their well-defined periodicity is also confirmed by the perfectly ordered superstructural constellations seen by LEED [ Fig.…”

Section: A Equilibrium Band Structuresupporting

confidence: 86%

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Varykhalov

Freyse

Aguilera

et al. 2020

Phys. Rev. Research

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We show that, although the equilibrium band dispersion of the Shockley-type surface state of two-dimensional Au(111) quantum films grown on W(110) does not deviate from the expected free-electron-like behavior, its nonequilibrium energy-momentum dispersion probed by time-and angle-resolved photoemission exhibits a remarkable kink above the Fermi level due to a significant enhancement of the effective mass. The kink is pronounced for certain thicknesses of the Au quantum well and vanishes in the very thin limit. We identify the kink as induced by the coupling between the Au(111) surface state and emergent quantum-well states which probe directly the buried gold-tungsten interface. The signatures of the coupling are further revealed by our time-resolved measurements which show that surface state and quantum-well states thermalize together behaving as dynamically locked electron populations. In particular, relaxation of hot carriers following laser excitation is similar for both surface state and quantum-well states and much slower than expected for a bulk metallic system. The influence of quantum confinement on the interplay between elementary scattering processes of the electrons at the surface and ultrafast carrier transport in the direction perpendicular to the surface is shown to be the reason for the slow electron dynamics.

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Section: A Equilibrium Band Structuresupporting

confidence: 86%

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Varykhalov

Freyse

Aguilera

et al. 2020

Phys. Rev. Research

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“…The formation of asymmetric herringbone patterns and the transition from herringbone to stripe patterns induced by applied strains have been largely observed (40)(41)(42), but an accurate theoretic analysis is still missing. To study the effect of strain on the Au(111) surface reconstruction, we applied tensile/compressive strain along with one of the soliton directions of the herringbone pattern.…”

Section: First Principalmentioning

confidence: 99%

Origin of the herringbone reconstruction of Au(111) surface at the atomic scale

Ding

2022

Sci. Adv.

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The origin of the herringbone reconstruction on Au(111) surface has never been explained properly at the atomic level because the large periodic length (~30 nm) does not allow ab initio simulations of the system and because of the lack of highly accurate empirical force field. We trained a machine learning force field with high accuracy to explore this reconstruction. Our study shows that the lattice deformation in Au deeper layers, which allows the effective relaxation of the densified and anisotropic top layer lattice, is critical for the herringbone reconstruction. The herringbone reconstruction is energetically more favorable than the stripe reconstruction only if the slab thickness exceeds 12 atomic layers. Furthermore, we reveal the high stability of herringbone reconstruction at high temperatures and that a slight strain of about ±0.2% can induce a transition from the herringbone pattern to the stripe pattern, and both agree well with the experimental observations.

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“…Quantification based on XPS is not necessary since coverages have already been determined by coulometry, and it is Faraday's Law that calibrates XPS intensities, not the other way around. With regard to the structural nature of the Au overlayers, results from UHV-based studies of Au on W(110) (38,39) have shown that submonolayer patches of Au evolve into a first monolayer that completely covers the surface; further addition of Au gives rise to three-dimensional growth.…”

Section: Ecs Transactions 75 (48) 1-17 (2017)mentioning

confidence: 99%

Electrocatalytic Reduction of CO₂on Cu and Au/W Electrode Surfaces: Empirical (DEMS) Confirmation of Computational (DFT) Predictions

et al. 2017

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This work describes the employment of differential electrochemical mass spectrometry (DEMS) as a supplementary experimental approach to theory in the study of the reaction mechanism of the Cu-catalyzed electrochemical reduction of CO 2 by investigating the reduction of reactants and (postulated) intermediates. The empirical inferences: (i) CO is one of the first products of CO 2 reduction, as well as the first intermediate in the formation of more reduced products (hydrocarbons and oxygenates). (ii) Formaldehyde, is not a precursor for C=C bond formation but is an intermediate for the production of methane and ethanol. (iii) Both methane and ethanol can be generated from CO 2 through the protonation of CO and through the HCHO intermediate. (iv) The generation of CH 4 and CH 3 CH 2 OH from CO and CO 2 has a much higher activation barrier than from HCHO; not unexpected since the formaldehyde intermediate is formed after the (computationally determined) rate-limiting COprotonation step. In this work, DEMS was also used to test the theoretical prediction † suggesting the viability of a bimetallic nearsurface alloy (NSA) consisting of Au and W as a CO 2 -reduction electrocatalyst selective towards the formation of methanol as a product, as opposed to methane, ethylene or ethanol. At an overlayer NSA that consisted of n monolayers (ML) of Au on a polycrystalline W electrode, W(pc)-n[(1×1)-Au], no methane, methanol, ethylene or ethanol was detected when the coverage of Au was at submonolayer (n = 0.5) or multilayer (n ≥ 2) coverages. However, when the NSA contained only 1 ML of Au, methanol was generated exclusively.

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Au(111) films on W(110) studied by STM and LEED – Uniaxial reconstruction, dislocations and Ag nanostructures

Cited by 9 publications

References 29 publications

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Origin of the herringbone reconstruction of Au(111) surface at the atomic scale

Electrocatalytic Reduction of CO₂on Cu and Au/W Electrode Surfaces: Empirical (DEMS) Confirmation of Computational (DFT) Predictions

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Au(111) films on W(110) studied by STM and LEED – Uniaxial reconstruction, dislocations and Ag nanostructures

Cited by 9 publications

References 29 publications

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Origin of the herringbone reconstruction of Au(111) surface at the atomic scale

Electrocatalytic Reduction of CO2on Cu and Au/W Electrode Surfaces: Empirical (DEMS) Confirmation of Computational (DFT) Predictions

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Electrocatalytic Reduction of CO₂on Cu and Au/W Electrode Surfaces: Empirical (DEMS) Confirmation of Computational (DFT) Predictions