Hydrogen adsorption on Ru(001) studied by scanning tunneling microscopy

Tatarkhanov, M.; Rose, Franck; Фомин, Э. В.; Ogletree, D. Frank; Salmerón, Miquel

doi:10.1016/j.susc.2007.10.042

Cited by 32 publications

(29 citation statements)

References 33 publications

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“…The same ͱ 3 ϫ ͱ 3 structure was observed after molecular hydrogen dissociative adsorption on clean Ru. 38,39 Another view of the stripes and their internal structure is shown in Fig. 3.…”

Section: B Stm Results: Thermal Treatmentmentioning

confidence: 99%

The structure of mixed H2O–OH monolayer films on Ru(0001)

Tatarkhanov

Фомин

Salmerón

et al. 2008

The Journal of Chemical Physics

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Scanning tunneling microscopy ͑STM͒ and x-ray absorption spectroscopy ͑XAS͒ have been used to study the structures produced by water on Ru͑0001͒ at temperatures above 140 K. It was found that while undissociated water layers are metastable below 140 K, heating above this temperature produces drastic transformations, whereby a fraction of the water molecules partially dissociate and form mixed H 2 O -OH structures. X-ray photoelectron spectroscopy and XAS revealed the presence of hydroxyl groups with their O-H bond essentially parallel to the surface. STM images show that the mixed H 2 O -OH structures consist of long narrow stripes aligned with the three crystallographic directions perpendicular to the close-packed atomic rows of the Ru͑0001͒ substrate. The internal structure of the stripes is a honeycomb network of H-bonded water and hydroxyl species. We found that the metastable low temperature molecular phase can also be converted to a mixed H 2 O-OH phase through excitation by the tunneling electrons when their energy is 0.5 eV or higher above the Fermi level. Structural models based on the STM images were used for density functional theory optimizations of the stripe geometry. The optimized geometry was then utilized to calculate STM images for comparison with the experiment.

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Section: B Stm Results: Thermal Treatmentmentioning

confidence: 99%

The structure of mixed H2O–OH monolayer films on Ru(0001)

Tatarkhanov

Фомин

Salmerón

et al. 2008

The Journal of Chemical Physics

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“…49,55,56 After dissociation the chemisorbed H on Ru͑0001͒ is located exclusively at the fcc site 50 forming various structures as the coverage increases.…”

Section: B Adsorption Of ·H On Rumentioning

confidence: 99%

Hydrogen mediated transport of Sn to Ru film surface

Faradzhev

Sidorkin

2009

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The authors report on the interaction of atomic hydrogen with Sn and thin Ru film at room temperature. The study is done using a combination of photoelectron and low energy ion scattering spectroscopies as well as scanning electron microscopy. The adsorption of hydrogen on a Sn surface leads to the formation of stannane ͑SnH 4 ͒, which dissociatively adsorbs on the surface of polycrystalline Ru film. In the range of effective Sn coverages studied ͑up to 1 ML͒, the resulting overlayer consists of randomly distributed three-dimensional islands with average size below 40 nm occupying up to several percent of the surface area. Nucleation of Sn is observed presumably at defect sites ͑e.g., grain boundaries͒. Ion scattering data are found consistent with Volmer-Weber growth mode: no initial transition wetting layer formation is detected. Oxidation of Sn islands on a Ru surface at room temperature results in the formation of SnO. Neither metallic nor oxidation states of Sn higher than Sn 2+ are observed by photoelectron spectroscopy.

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“…We had previously identified them as CH adsorbed at hcp hollow sites [17]. In addition, small shallow depressions about 30 pm deep are also visible, which correspond to H atoms adsorbed at fcc hollow sites of the Ru(0001) surface [17,[24][25][26][27][28][29][30]. In contrast to C, the H atoms are easily perturbed by the electric field of the STM tip, which can cause them to diffuse even when the tip is several nanometers away.…”

Section: Formation Of Ch From C and Hmentioning

confidence: 99%

Structure and reactions of carbon and hydrogen on Ru(0001): A scanning tunneling microscopy study

Shimizu

Mugarza

Cerdá

et al. 2008

The Journal of Chemical Physics

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The interaction between carbon and hydrogen atoms on a Ru(0001) surface was studied using scanning tunneling microscopy (STM), Density Functional Theory (DFT) and STM image calculations.Formation of CH species by reaction between adsorbed H and C was observed to occur readily at 100 K.When the coverage of H increased new complexes of the form CH+nH (n = 1, 2 and 3) were observed. These complexes, never observed before, might be precursors for further hydrogenation reactions. DFT analysis reveals that a considerable energy barrier exists for the CH+H CH 2 reaction. * Current address: Surface Chemistry Lab., RIKEN (The institute of physical and chemical research), 2-

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Hydrogen adsorption on Ru(001) studied by scanning tunneling microscopy

Abstract: The adsorption of hydrogen on Ru(001)

Cited by 32 publications

References 33 publications

The structure of mixed H2O–OH monolayer films on Ru(0001)

The structure of mixed H2O–OH monolayer films on Ru(0001)

Hydrogen mediated transport of Sn to Ru film surface

Structure and reactions of carbon and hydrogen on Ru(0001): A scanning tunneling microscopy study

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