Growth study of Cu/Pd(111) by RHEED and XPS

Siervo, Abner de; Paniago, R.; Soares, E.A.; Pfannes, H.‐D.; Landers, Richard; Kleiman, G. G.

doi:10.1016/j.susc.2004.11.028

Cited by 24 publications

(25 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33 More precisely, the stripe, triangular, and honeycomb structures seen in experiments at two, three, and four monolayers, respectively, were very similar to those obtained from simulations in which V 0 was lowered from 0.015 to V 0 = 0.0032,0.00087, and 0.00043, respectively (see Ref. 33 for a direct comparison of simulation and experimental 47,48 point to layer-bylayer growth at room temperature. No alloying is observed and a recovery of the Cu incommensurate lattice spacing takes place for coverages larger than 4 ML.…”

Section: F Comparison With Experimental Data and Model Predictionssupporting

confidence: 71%

Modeling self-organization of thin strained metallic overlayers from atomic to micron scales

et al. 2013

View full text Add to dashboard Cite

A computational study of the self-organization of heteroepitaxial ultrathin metal films is presented. By means of a continuum complex field model, the relationship of the equilibrium surface patterns of the film to the adsorbate-substrate adhesion energy, as well as to the mismatch between the adsorbate and the substrate bulk lattice parameters, are obtained in both the tensile and the compressive regimes. Our approach captures pattern periodicities over large length scales, up to several hundreds of nm, retaining atomistic resolution. Thus, the results can be directly compared with experimental data, in particular for systems such as Cu/Ru(0001) and Ag/Cu(111). Three nontrivial, stable superstructures for the overlayer, namely, stripe, honeycomb, and triangular, are identified that closely resemble those observed experimentally. Simulations in nonequilibrium conditions are performed as well to identify metastable structural configurations and the dynamics of ordering of the overlayer.

show abstract

Section: F Comparison With Experimental Data and Model Predictionssupporting

confidence: 71%

Modeling self-organization of thin strained metallic overlayers from atomic to micron scales

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Experimentally it has been found that the growth of Cu is layer-by-layer at room temperature. [10][11][12] In the submonolayer regime the substrate becomes gradually covered by two-dimensional ͑2D͒ islands. 10 Although near 1 ML coverage there is some indication of dislocations, 10,12,13 only at 2-3 ML the average lattice constant reduces to the relaxed value.…”

mentioning

confidence: 99%

“…10 Although near 1 ML coverage there is some indication of dislocations, 10,12,13 only at 2-3 ML the average lattice constant reduces to the relaxed value. This has been interpreted as a transition to relaxed morphology 11,12 leading to the conclusion that the pseudomorphic structure is stable up to 2-3 ML.…”

mentioning

confidence: 99%

“…In the measured RHEED intensities, however, there is a Cu-like peak already visible and distinguishable from the Pd-like at Ϸ1.5 ML. 11 To estimate the degree of epitaxy in the overlayers exhibiting fcc-hcp domains, we plot the average structure function ͉͚ Cu exp͑ik x x͉͒ 2 averaged over eight configurations after incorporation at 1.18 ML coverage in Fig. 4.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Stress release mechanisms for Cu on Pd(111) in the submonolayer and monolayer regimes

et al. 2010

View full text Add to dashboard Cite

We study the strain relaxation mechanisms of Cu on Pd͑111͒ up to the monolayer regime using two different computational methodologies, basin-hopping global optimization and energy minimization with a repulsive bias potential. Our numerical results are consistent with experimentally observed layer-by-layer growth mode. However, we find that the structure of the Cu layer is not fully pseudomorphic even at low coverages. Instead, the Cu adsorbates forms fcc and hcp stacking domains, separated by partial misfit dislocations. We also estimate the minimum energy path and energy barriers for transitions from the ideal epitaxial state to the fcc-hcp domain pattern. Introduction. Metallic surfaces and nanostructures are essential systems for heterogeneous catalysis. Combination of two metals can lead to significant improvements in the variability and frequency of the reactions catalyzed. To prepare controlled nanostructures, it is crucial to understand the growth and stability of heteroepitaxial metal systems, in particular for close-packed surfaces. On fcc͑111͒ it has been found that to release the stress, the overlayer can adopt several alternative strategies which lead to a structure of domains separated by partial misfit dislocations.1-7 The domains correspond to the two favorable sites, fcc and hcp. This behavior is expected to be ubiquitous and should not depend strongly on the interaction potentials or the overlayer-substrate mismatch.

show abstract

“…This work is an extension of our previous studies on bimetallic systems: Pd/Cu(111) [13,14], Cu/Pd(111) [15], Pd/Ni(111) [16,17], and Ni/Pd(111) [17,18]. The deposition of Pd on Cu(111) led to the formation of a random surface alloy with Pd diffusing up to at least the third atomic layer [13,14].…”

Section: Introductionmentioning

confidence: 62%

Characterization of Ultra-Thin Films of Pd Deposited on Au(111)

et al. 2011

Self Cite

View full text Add to dashboard Cite

Ultra-thin films (1 and 3 monolayers) of Pd were deposited on the Au(111) surface and then characterized by X-ray photoelectron spectroscopy (XPS), X-ray excited Auger spectroscopy (XAES), low-energy electron diffraction (LEED), and X-ray photoelectron diffraction (XPD). For the 1 ML Pd film annealed at 450°C, XPS and XAES results indicated that Pd had diffused into the Au substrate. For the 3 ML Pd film deposited at room temperature, the comparison between experimental and theoretical XPD results indicated approximately 30% of the surface was formed by 2 ML Au layers, and 70% of the surface, by 1 ML Au layers.

show abstract

Growth study of Cu/Pd(111) by RHEED and XPS

Cited by 24 publications

References 14 publications

Modeling self-organization of thin strained metallic overlayers from atomic to micron scales

Modeling self-organization of thin strained metallic overlayers from atomic to micron scales

Stress release mechanisms for Cu on Pd(111) in the submonolayer and monolayer regimes

Characterization of Ultra-Thin Films of Pd Deposited on Au(111)

Contact Info

Product

Resources

About