Adsorption and growth on nanostructured surfaces

Zeppenfeld, P.; Diercks, V.; Tölkes, Christian; David, Rudolf; Krzyzowski, Michael A.

doi:10.1016/s0169-4332(98)00105-6

Cited by 30 publications

(20 citation statements)

References 31 publications

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“…In the present work, we have chosen to investigate the Kondo effect of single Co adatoms on a nanostructured Cu-O surface, which is based on a Cu͑110͒ template. Under suitable conditions of oxygen pressure and of the Cu͑110͒ substrate temperature, a regular Cu-O "stripe" phase develops in which regions of the Cu-O ͑2 ϫ 1͒ surface reconstruction self-assemble into nanoscopic Cu-O stripes separated by stripes of the clean Cu͑110͒ surface [18][19][20] ͓see Fig. 1͑a͔͒.…”

Section: Introductionmentioning

confidence: 99%

Kondo effect of cobalt adatoms on nanostructured Cu-O surfaces: Scanning tunneling spectroscopy experiments and first-principles calculations

et al. 2010

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The Kondo response of single Co adatoms on a nanostructured Cu͑110͒-O stripe phase is studied using scanning tunneling spectroscopy ͑STS͒ and first-principles calculations. The nanostructured Cu-O substrate consists of a regular array of clean Cu͑110͒ and oxygen-reconstructed Cu͑110͒ 2 ϫ 1-O stripes and allows us to measure STS of Co adatoms in different chemical environments under identical experimental conditions. The characteristic Kondo parameters are obtained from the Fano line-shape analysis of the STS data, finding a qualitatively different behavior on clean Cu͑110͒ and Cu͑110͒ 2 ϫ 1-O adsorption sites, with a Fano-type peak around the Fermi energy in STS on Cu͑110͒ and a Fano dip on Cu͑2 ϫ 1͒-O, and mean Kondo temperatures of ϳ125 K and ϳ93 K, respectively. Density-functional calculations are performed to reveal the detailed geometry and the electronic structure of the Co adsorption complexes, and are used in conjunction with simple models of the Kondo effect to rationalize the present experimental observations and the trends with respect to literature data on other Cu surfaces.

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Section: Introductionmentioning

confidence: 99%

Kondo effect of cobalt adatoms on nanostructured Cu-O surfaces: Scanning tunneling spectroscopy experiments and first-principles calculations

et al. 2010

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“…It has been demonstrated that the herringbone structure can be used to organize regular arrays of metallic clusters. [19][20][21][22][23][24] In the case of Fe, which has attracted great interest owing to its large magnetic moment, dosed Fe atoms nucleate preferentially at the elbows of the herringbone structure, form polygonal islands, grow laterally in size, and coalesce along the h11 " 2 2i direction leading to regularly spaced stripes. 19) Although many kinds of vicinal metal substrates are known as high-quality templates for the construction of 1D or two-dimensional (2D) nanostructures, 12,[25][26][27] the vicinal Au(111) surfaces are unique among them.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional Fe Nanostructures Formed on Vicinal Au(111) Surfaces

et al. 2005

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In this study of fabricated one-dimensional (1D) nanostructures of Fe adatoms on vicinal Au(111) surfaces, the growth mechanism and electronic structures are investigated by scanning tunneling microscopy (STM) and by angle-resolved photoemission spectroscopy (ARPES). STM observations reveal that dosed Fe atoms are trapped at the lower corners of the steps. They create nucleation centers near the intersections between steps and discommensuration lines, and grow into evenly spaced Fe fragments located at face-centered-cubic (fcc) stacking regions of the substrate. The connection of these fragments aligned along the steps results in the formation of Fe monatomic rows. As the Fe coverage increases, the Fe growth proceeds predominantly at the fcc stacking regions, and forms quasi-1D nanostructures with undulating edges. At an Fe coverage of $0:6 ML, the fast-growing parts connect with the adjacent Fe structures and a two-dimensional network structure is built up. ARPES measurements reveal that the decoration of the step edges with Fe has a significant influence on the periodic potential of the surface state electrons confined between the regularly arranged steps. On the surface with Fe monatomic rows, photoemission spectra measured in the direction perpendicular to the steps show a parabolic dispersion of the Au(111) surface state with downward energy shift of the band bottom; the clean surface, in contrast, shows two 1D quantum-well levels. A simple analysis using a 1D Kronig-Penny model reveals that the Fe decoration reduces the potential barrier height at the steps from 20 to 4.6 eV # A, suggesting that the Fe adatoms work as attractive scatterers and increase the probability of transmission through the barriers. Furthermore, for the higher Fe coverage, the spectra reflecting the electronic nature of the 1D nanostructures show little dispersion, suggesting that the Fe 3d states are localized in the 1D structures.

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“…Such nanostructured surfaces thus provide ideal templates to study the influence of the finite domain size on the adsorption, binding, and structure formation of atoms and molecules. 7,8 For the present case, we have studied the adsorption of molecular nitrogen on the nanostructured Cu-CuO stripe phase. As shown previously, 4,8 the adsorption of submonolayer amounts of oxygen (⌰ O Ͻ0.5) and subsequent annealing results in the formation of a regular array of alternating CuO and bare Cu͑110͒ stripes.…”

Section: Introductionmentioning

confidence: 99%

Selective adsorption and structure formation ofN2on the nanostructured Cu-CuO stripe phase

et al. 2002

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The adsorption of nitrogen molecules on the nanostructured Cu(110)-Cu(110)-(2ϫ1)O surface was studied both experimentally using He atom diffraction and thermal desorption spectroscopy as well as theoretically using a semiempirical potential approach. The substrate ͑referred to as the Cu-CuO stripe phase͒ provides a unique template for studying the adsorption, structure formation and desorption on narrow terraces ͑stripes͒ of alternating Cu͑110͒ and Cu(110)-(2ϫ1)O areas, whose width can be varied systematically by the amount of preadsorbed oxygen ⌰ O . The adsorption of N 2 on the Cu-CuO stripe phase occurs in a selective and sequential manner according to the hierarchy of the available binding sites. The molecules are first adsorbed in a lattice gas phase on top of the CuO stripes, followed by the formation of a dense monolayer phase on the bare Cu stripes. Finally, additional molecules are adsorbed on the CuO stripes leading to a compression of the lattice gas phase. We find a substantial influence of the finite size of the stripes on the ordering of the adlayer of N 2 as compared to the adsorption on extended terraces of the homogeneous surfaces of Cu͑110͒ (⌰ O ϭ0) and Cu(110)-(2ϫ1)O (⌰ O ϭ0.5), respectively. On large Cu stripes (⌰ O Ͻ0.1), a pinwheel structure for the N 2 monolayer is found to be stable, whereas a (4ϫ3) compressed phase is observed on large CuO stripes (⌰ O Ͼ0.38). For stripe widths below 30-50 Å (0.1Ͻ⌰ O Ͻ0.38), the diffraction signatures from the orientationally ordered commensurate phases disappear in the experiment as well as in the calculated structure factors. The calculations reveal that the original structures become disordered as a result of the confinement of the N 2 layer and the strong pinning of the adlayer to the step edges separating neighboring Cu and CuO stripes. The orientational order appears to be particularly sensitive, whereas the local positional order and the preferred adsorption sites of the molecules are essentially preserved.

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Adsorption and growth on nanostructured surfaces

Cited by 30 publications

References 31 publications

Kondo effect of cobalt adatoms on nanostructured Cu-O surfaces: Scanning tunneling spectroscopy experiments and first-principles calculations

Kondo effect of cobalt adatoms on nanostructured Cu-O surfaces: Scanning tunneling spectroscopy experiments and first-principles calculations

One-dimensional Fe Nanostructures Formed on Vicinal Au(111) Surfaces

Selective adsorption and structure formation ofN2on the nanostructured Cu-CuO stripe phase

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