Scanning Tunneling Microscopy Studies of Metal on Metal Epitaxy

Hwang, R. Q.; Bartelt, M. C.

doi:10.1021/cr960070h

Cited by 80 publications

(52 citation statements)

References 103 publications

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“…14 -20 It results from the formation of misfit dislocations induced by the incorporation of adsorbed atoms in the top surface layer, therefore increasing the surface atom density. 20,21 This is a basic mechanism for strain relief, which allows the density of the film to differ from that of the substrate. The basic structural ingredient is a stacking fault.…”

Section: Resultsmentioning

confidence: 99%

Influence of strain in Ag on Al(111) and Al on Ag(100) thin film growth

et al. 2003

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We demonstrate the influence of interfacial strain on the growth modes of Ag films on Al(111), despite the small magnitude of the lattice misfit in this system. The strain is relieved by the formation of stacking fault domains bounded by Shockley partial dislocations. The growth mode and the step roughness appear to be strongly connected. Growth is three-dimensional (3D) as long as the steps are straight, but switches to 2D at higher coverage when the steps become rough. Anisotropic strain relaxation and straight steps seem to be related. We also report related observations for Al deposited on Ag(100). Keywords Ames Laboratory Disciplines Physical Chemistry CommentsThis article is from Physical Review B 67, no. 15 (2003) We demonstrate the influence of interfacial strain on the growth modes of Ag films on Al͑111͒, despite the small magnitude of the lattice misfit in this system. The strain is relieved by the formation of stacking fault domains bounded by Shockley partial dislocations. The growth mode and the step roughness appear to be strongly connected. Growth is three-dimensional ͑3D͒ as long as the steps are straight, but switches to 2D at higher coverage when the steps become rough. Anisotropic strain relaxation and straight steps seem to be related. We also report related observations for Al deposited on Ag͑100͒.

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Section: Resultsmentioning

confidence: 99%

Influence of strain in Ag on Al(111) and Al on Ag(100) thin film growth

et al. 2003

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“…Our focus is on the formation of bimetallic NCs by deposition on well-characterized surfaces at lower temperatures (T). This choice of formation pathway has the appealing feature that one can access a large phase space of far-from-equilibrium structures, [6][7][8] potentially allowing greater tuning of properties. In part motivated by these possibilities, a few studies have explored corering structures of two-dimensional (2D) epitaxial bimetallic NCs, [9][10][11] systems for which predictive atomistic-level modeling of NC structure formation is becoming viable.…”

Section: Introductionmentioning

confidence: 99%

Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

Han

Engstfeld

Behm

et al. 2013

The Journal of Chemical Physics

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The formation of Pt-Ru nanoclusters (NCs) by sequential deposition of Pt and Ru on a periodically rumpled graphene sheet supported on Ru(0001) is analyzed by atomistic-level modeling and kinetic Monte Carlo simulations. The "coarse-scale" periodic variation of the adsorption energy of metal adatoms across the graphene sheet directs the assembly of NCs to a periodic array of thermodynamically preferred locations. The modeling describes not only just the NC densities and size distributions, but also the composition distribution for mixed NCs. A strong dependence of these quantities on the deposition order is primarily related to different effective mobilities of Pt and Ru on the supported graphene. Disciplines Biological and Chemical Physics CommentsThe following article appeared in Journal of Chemical Physics 138,13 (2013) The formation of Pt-Ru nanoclusters (NCs) by sequential deposition of Pt and Ru on a periodically rumpled graphene sheet supported on Ru(0001) is analyzed by atomistic-level modeling and kinetic Monte Carlo simulations. The "coarse-scale" periodic variation of the adsorption energy of metal adatoms across the graphene sheet directs the assembly of NCs to a periodic array of thermodynamically preferred locations. The modeling describes not only just the NC densities and size distributions, but also the composition distribution for mixed NCs. A strong dependence of these quantities on the deposition order is primarily related to different effective mobilities of Pt and Ru on the supported graphene.

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“…The ordered nanoscale structure formed by alternating domains of material A and B is of particular interest. Such domains are vaguely called stripes or veins, and their formation with a width on the order of nanometers has been observed in a variety of AB/S material systems, including CoAg/Ru(0001) [8,9], CoAg/Mo(110) and FeAg/Mo(110) [4], CuAg/Ru(0001) [10], or PdAu/Ru(0001) [11]. Besides the above mentioned stripe substructure, the two component islands in some cases also display dendritic growth [8,9].…”

Section: Introductionmentioning

confidence: 99%

Interplay of strain relaxation and chemically induced diffusion barriers: Nanostructure formation in 2D alloys

Volkmann¹,

Much²,

Biehl³

et al. 2005

Surface Science

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We study the formation of nanostructures with alternating stripes composed of bulk-immiscible adsorbates during submonolayer heteroepitaxy. We evaluate the influence of two mechanisms considered in the literature: (i) strain relaxation by alternating arrangement of the adsorbate species, and (ii) kinetic segregation due to chemically induced diffusion barriers. A model ternary system of two adsorbates with opposite misfit relative to the substrate, and symmetric binding is investigated by off-lattice as well as lattice kinetic Monte Carlo simulations. We find that neither of the mechanisms (i) or (ii) alone can account for known experimental observations. Rather, a combination of both is needed. We present an off-lattice model which allows for a qualitative reproduction of stripe patterns as well as island ramification in agreement with recent experimental observations for CoAg/Ru(0001) [R. Q. Hwang, Phys. Rev. Lett. 76, 4757 (1996)]. The quantitative dependencies of stripe width and degree of island ramification on the misfit and interaction strength between the two adsorbate types are presented. Attempts to capture essential features in a simplified lattice gas model show that a detailed incorporation of non-local effects is required.

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Scanning Tunneling Microscopy Studies of Metal on Metal Epitaxy

Cited by 80 publications

References 103 publications

Influence of strain in Ag on Al(111) and Al on Ag(100) thin film growth

Influence of strain in Ag on Al(111) and Al on Ag(100) thin film growth

Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

Interplay of strain relaxation and chemically induced diffusion barriers: Nanostructure formation in 2D alloys

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