On the low-temperature growth of Pb on Cu (100)

Robert, Sarah; Gauthier, Sébastien; Duvault, J.L.; Klein, J.

doi:10.1016/s0039-6028(97)00534-7

Cited by 14 publications

(9 citation statements)

References 47 publications

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“…Vapor-phase deposition of Pb on Cu surfaces has been examined mostly by vacuum techniques in the past decade, revealing partial displacement of the uppermost layer of Cu with Pb atoms preferentially at step ledges at low coverage, followed by the formation of an alloyed structure of c (4 × 4) at a coverage of 0.375. However, dealloying commences as the coverage is increased to 0.5 or higher. − Three superlattices of Pb at Cu(100) have been identified, including c (2 × 2), strained c (2 × 2) and (5√2 × √2) R 45° as the coverage is increased to 0.5 to 0.6 ML, where ML is defined as the number of Pb atom/Cu substrate atom.…”

Section: Introductionmentioning

confidence: 99%

“…Although annealing leads to a (√2 × √2) R 45° structure, it is ascribed to the coadsorbed chloride anions. No ordered structure of Pb adatoms has been found on Cu(100) throughout the deposition process, although three ordered arrangements are identified in a vacuum. − This contrast is assumed to arise from the high mobility of Pb adatoms at room temperature …”

Section: Introductionmentioning

confidence: 99%

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In Situ Scanning Tunneling Microscopy of Underpotential Deposition of Lead on Cu(100) in Sulfuric Acid Solutions

and

Yau

2001

J. Phys. Chem. B

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In situ scanning tunneling microscopy (STM) has been used to examine underpotential deposition (UPD) of lead at Cu(100) electrode in 0.1 M sulfuric acid containing 1 mM Pb(ClO4)2. Real-time STM imaging revealed high surface mobility of Cu(100) at 0.05 V in sulfuric acid solutions. The amount of lead deposition could influence the surface morphology, particularly the orientation and ruggedness of steps. Deposition of a small amount of Pb vastly decreased kink density and meanwhile caused step realignments in the 〈011〉 direction. Raising the coverage of Pb atoms effected rotation of step ledges by 45° to align in the 〈001〉 direction. In situ STM was unable to reveal the atomic structures of the surface alloys formed by submonolayer Pb atoms, probably because of the lack of a highly ordered arrangement and high surface mobility. As the coverage of lead atoms exceeds 0.5, high-quality STM atomic resolution revealed three superlattices, including c(2 × 2), compressed c(2 × 2), and (5√2 × √2)R45° as the coverage of lead is increased from 0.5 to 0.6. These results are similar to those obtained in an ultrahigh vacuum environment. In situ STM also revealed defects arranging in pairwise and clustering fashions amid a well-ordered c(2 × 2) structure. These features are tentatively attributed to Pb atoms locally embedded in the Cu lattice, ultimately resulting from attractive interaction among the Pb atoms. The compressed c(2 × 2) structure consisted of microdomains of c(2 × 2) surrounded by anti-phase domain boundaries. The (5√2 × √2)R45° structure appearing at the end of UPD feature comprised of alternating straight and zigzag chains running parallel to the 〈001〉 direction. In situ STM imaged a high density of missing defects, predominantly located in the straight chains.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Scanning Tunneling Microscopy of Underpotential Deposition of Lead on Cu(100) in Sulfuric Acid Solutions

and

Yau

2001

J. Phys. Chem. B

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“…Different kinds of film structure growing on a ͑100͒ substrate have been investigated in literatures. [13][14][15] Nonetheless, a systematic study of the positive and negative lattice mismatches on the structure of a film layer has rarely been conducted. The information is missed: to what degree can the tensile-compressive anharmonicity break the symmetry of the epitaxial growth predicted by the continuum theory?…”

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confidence: 99%

“…Therefore, an epitaxial growth on the (100) surface for fcc metals will compete with the formation of the (111) structure. Different kinds of film structure growing on a (100) substrate have been investigated in literatures 13,14,15 . Nonetheless, a systematic study of the positive and negative lattice mismatch on the structure of a film layer has rarely been conducted.…”

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confidence: 99%

Strong asymmetric effect of lattice mismatch on epilayer structure in thin-film deposition

et al. 2009

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We investigate the heteroepitaxial growth of thin film deposited on a ͑001͒ substrate via molecular-dynamics simulations, using six fcc transition metals as our modeling systems. By studying the radial distribution function in the film layers, we demonstrate the importance of the sign of lattice mismatch on the layer structure. For positive lattice mismatches, the film favors pseudomorphic growth, whereas for negative mismatches, a sharp transition happens within the first few monolayers of adatoms and the film layers are transformed into the close-packed ͑111͒ structure. We propose a way to quantify the compositional percentage of different planar structures in an epilayer and demonstrate the strong asymmetric effect between the tensile and compressive cases of deposition. How temperature affects the asymmetry is also discussed.

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“…20 The Cu͑100͒ and Cu͑111͒ surfaces ͑Surface Preparation Laboratory, Zaandam, NL͒ were cleaned by the usual cycling procedure of Arϩ ion sputtering ͑600 eV, 3.5 A͒ followed by annealing at 500°C. Cobalt was evaporated onto the Cu͑111͒ by resistive heating a Co wire ͑Goodfellow, 0.25-mm thick, purity 99.99ϩ%͒.…”

Section: Methodsmentioning

confidence: 99%

Deformation of a 3.7-nm long molecular wire at a metallic step edge

et al. 2002

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The adsorption of a new molecule constituted of a 3.7-nm long conjugated board equipped with eight lateral legs was studied with scanning tunneling microscopy on the Cu͑100͒ and nanostructured Cu͑111͒ surfaces. The conformation of the adsorbed molecules was extracted by comparing experimental images with calculated ones. In particular, we demonstrate that not only are the legs free to rotate, but also that the central board is distorted at doubles steps. The van der Waals interaction of the conjugated board with the metallic surface is shown to be responsible for the deformation of the molecules.

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On the low-temperature growth of Pb on Cu (100)

Cited by 14 publications

References 47 publications

In Situ Scanning Tunneling Microscopy of Underpotential Deposition of Lead on Cu(100) in Sulfuric Acid Solutions

In Situ Scanning Tunneling Microscopy of Underpotential Deposition of Lead on Cu(100) in Sulfuric Acid Solutions

Strong asymmetric effect of lattice mismatch on epilayer structure in thin-film deposition

Deformation of a 3.7-nm long molecular wire at a metallic step edge

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