Dynamics of step fluctuations on Pd() surface as observed by STM

Yagi-Watanabe, Kazutoshi; Suzuki, Daigo; Fukutani, Hirohito

doi:10.1016/s0039-6028(02)02143-x

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…Many defects, which are due to missing Pd atoms as a result of the depth 0.13 -0.17 nm, are seen. 14) The number of defects increased when the cooling after annealing was faster than ca. 10 K s À1 .…”

Section: Resultsmentioning

confidence: 99%

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N₂O Orientation on Pd(110)

Watanabe

Kokalj

Horino

et al. 2006

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The orientation of adsorbed N2O on Pd(110) was studied by scanning tunneling microscopy, near-edge X-ray absorption fine structure (NEXAFS), and density functional theory. Below 14 K, N2O(a) forms clusters extending along the [1 10] direction as well as monomers oriented along the [001] direction. In the clusters, N2O is tilted with the terminal nitrogen bonding to the surface. The clusters are mobile at 14 K and stable at 8 K, whereas the monomers are stable at 14 K. In NEXAFS work at 60 K, remarkable anisotropy was found in the polarization dependence of π resonance, which was consistent with a mixture of the tilted and [001]-oriented forms.

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Section: Resultsmentioning

confidence: 99%

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N₂O Orientation on Pd(110)

Watanabe

Kokalj

Horino

et al. 2006

jjap

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“…Dynamic STM measurements on clean metal surfaces revealed the dynamics of step edges. Atoms detach from a step edge, diffuse around on the terrace and get trapped at a different place. − Mobility of surface atoms is expected at the temperatures used, as the Hüttig temperature of cobalt is ∼530 K, and heating to 630 K was sufficient to anneal the surface after sputtering. By taking this into account, we can speculate how this would play a role during graphene growth.…”

Section: Discussionmentioning

confidence: 99%

Atomic and Polymeric Carbon on Co(0001): Surface Reconstruction, Graphene Formation, and Catalyst Poisoning

et al. 2012

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Atomic carbon on Co(0001), deposited by ethylene decomposition, forms islands with a (√3 × √3)R30°structure at low C coverage (∼0.2 ML), whereas a high C coverage (0.5 ML, saturation) induces a reconstruction of the cobalt surface. Atomic carbon weakens the adsorption of CO and H 2 , but even a saturated atomic carbon layer does not block the surface for adsorption. Carbon−carbon coupling, i.e., polymeric carbon formation, was not observed for temperatures ≤630 K on the close-packed cobalt surface. Polymeric carbon, in the form of small graphene islands, forms on the close-packed terraces after heating of an acetylene-saturated surface. Graphene also forms upon heating of an atomic carbon covered surface on which ethylene was dosed at low temperature. In this case, step edges act as a nucleation point of the graphene islands, while their growth proceeds via the addition of C 2 H x species. In both cases, hydrogenated forms of carbon rather than atomic carbon are key precursors for graphene growth. Graphene covers the cobalt surface, thereby inhibiting adsorption of CO and hydrogen completely. The described graphene formation mechanism is seen as a relevant, low temperature route to detrimental carbon that would deactivate a cobalt FT catalyst. Atomic carbon is more reactive than graphene, as it is oxidized at lower temperatures than graphene. The graphene islands formed at relatively low temperatures are of poor structural quality and contain (islands of) encapsulated cobalt atoms.

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Section: G T X Y T T X Y Tmentioning

confidence: 99%

“…Scaling of the correlation function with z=2 (or equivalently, scaling of Fourier mode decay time with the square of wave number [8-10, 12-14,16-17]) has been observed in experiment for Si(111) [8,15] at elevated temperatures, for Si(001) in two distinct temperature regimes [16,17], for the corrugated metal surfaces Au(110) [18] and Mo(011) [10] at elevated temperature and Pd (110) [19] at room temperature, and for Si(111) with a 3 3 × R30˚ overlayer of Al at elevated temperature [20]. It is rather surprising that the z=3 signature of terrace diffusion for isolated steps (or short wavelength fluctuations) has scarcely ever been seen.…”

Section: G T X Y T T X Y Tmentioning

confidence: 99%

Distinguishing step relaxation mechanisms via pair correlation functions

et al. 2004

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Dynamics of step fluctuations on Pd() surface as observed by STM

Cited by 8 publications

References 31 publications

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N₂O Orientation on Pd(110)

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N₂O Orientation on Pd(110)

Atomic and Polymeric Carbon on Co(0001): Surface Reconstruction, Graphene Formation, and Catalyst Poisoning

Distinguishing step relaxation mechanisms via pair correlation functions

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Dynamics of step fluctuations on Pd() surface as observed by STM

Cited by 8 publications

References 31 publications

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N2O Orientation on Pd(110)

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N2O Orientation on Pd(110)

Atomic and Polymeric Carbon on Co(0001): Surface Reconstruction, Graphene Formation, and Catalyst Poisoning

Distinguishing step relaxation mechanisms via pair correlation functions

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Product

Resources

About

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N₂O Orientation on Pd(110)

Scanning-Tunneling Microscopy, Near-Edge X-ray-Absorption Fine Structure, and Density-Functional Theory Studies of N₂O Orientation on Pd(110)