Probing the structures of bimetallic Sn/Rh(111) surfaces: Alkali-ion scattering and x-ray photoelectron diffraction studies

Li, Yingdong; Voß, M.; Tsai, Yi-Li; Koel, Bruce E.

doi:10.1103/physrevb.56.15982

Cited by 32 publications

(17 citation statements)

References 22 publications

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“…Oxidation of the tin film on a Rh͑111͒ surface shows a periodic ͑2 ϫ 2͒ superstructure. The ͑2 ϫ 2͒ superstructure appears to be due to an ultrathin tin oxide film on Rh͑111͒, since the superstructures differ for rhodium oxide on a Rh͑111͒ surface ͑͑9 ϫ 9͒ superstructure 17 ͒ and the surface alloy formation of tin on a Rh͑111͒ surface ͑͑ͱ3 ϫ ͱ 3͒R30°s uperstructure 18 ͒. While the ͑2 ϫ 2͒ structure indicates that the Sn coverage is 1/4, 1/2, or 3/4 ML, the ͑2 ϫ 2͒ LEED spots become the sharpest at a coverage of 0.5 ML.…”

Section: Discussionmentioning

confidence: 99%

Growth and structure of an ultrathin tin oxide film on Rh(111)

Yuhara

Tajima

Matsui

et al. 2011

Journal of Applied Physics

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The oxidation of submonolayer tin films on a Rh(111) surface by O2 gas was studied using low energy electron diffraction, Auger electron spectroscopy, x-ray photoemission spectroscopy (XPS), and scanning tunneling microscopy. A uniform tin oxide monolayer film formed at oxidation temperatures around 500 °C and a partial pressure of 2×10−7 mbar O2. The tin oxide film had (2×2) periodicity on the Rh(111) surface, and the resulting tin coverage was determined to be 0.5 ML. Using XPS, the compositional ratio O/Sn was determined to be 3/2. XPS spectra showed a single component for the Sn and O peaks, indicating a uniform bonding environment. Finally, ab initio density-functional theory total energy calculations and molecular dynamics simulations were performed using the projector augmented wave method to determine the detailed structure of the tin oxide thin film.

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Section: Discussionmentioning

confidence: 99%

Growth and structure of an ultrathin tin oxide film on Rh(111)

Yuhara

Tajima

Matsui

et al. 2011

Journal of Applied Physics

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“…Detailed descriptions of the scanning tunneling microscopy ͑STM͒ chamber and alkali lowenergy ion scattering spectroscopy ͑ALISS͒ chamber can be found elsewhere. 17,18 The Pt sample was cleaned by cycles of 500-eV Ar ϩ ion sputtering, and then annealing in 5ϫ10 Ϫ7 -Torr O 2 with the sample at 1000 K, and finally annealing in vacuum with the sample at 1200 K. This procedure resulted in the characteristic low energy electron diffraction ͑LEED͒ pattern for the hex-reconstructed Pt͑100͒ surface and no contamination at the surface was detected by Auger electron spectroscopy in the STM chamber or by x-ray photoelectron spectroscopy in the ALISS chamber. The same Pt͑100͒ single crystal was used in both chambers.…”

Section: Experimental Methodsmentioning

confidence: 99%

Suppressed surface alloying for a bulk miscible system: Ge on Pt(100)

Batzill

Matsumoto

et al. 2004

Phys. Rev. B

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“…Previous work in our groups has focused on the synthesis and characterization of ordered, bimetallic surfaces prepared by vapor deposition of a second metal component on a transition metal substrate. For example, we have prepared several ordered alloy, or intermetallic compound, surfaces involving Pt–Sn, , Pd–Zn, , Pd–Cu, Rh–Sn, Ni–Sn, and Pt–Ge systems. Such ordered bimetallic surface alloys are helpful in clarifying the origins of the changes that occur in the chemistry of the substrate metal − due to either geometric and electronic effects because of the well-defined composition and structure of these surfaces.…”

Section: Introductionmentioning

confidence: 99%

Alloy Formation and Chemisorption at Zn/Pt(111) Bimetallic Surfaces Using Alkali ISS, XPD, and TPD

Martono

Banerjee

et al. 2013

J. Phys. Chem. A

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Alloy formation and chemisorption at bimetallic surfaces formed by vapor-depositing Zn on a Pt(111) single crystal were investigated primarily by using X-ray photoelectron diffraction (XPD), X-ray photoelectron spectroscopy (XPS), low-energy alkali ion scattering spectroscopy (ALISS), low electron energy diffraction (LEED), and temperature programmed desorption (TPD). A wide range of conditions were investigated to explore whether deposition and annealing of Zn films could produce well-defined, ordered alloy surfaces, similar to those encountered for Sn/Pt(111) surface alloys. These attempts were unsuccessful, although weak, diffuse (2 × 2) spots were observed under special conditions. The particular PtZn bimetallic alloy created by annealing one monolayer of Zn on Pt(111) at 600 K, which has a Zn composition in the surface layer of about 5 at. %, was investigated in detail by using XPD and ALISS. Only a diffuse (1 × 1) pattern was observed from this surface by LEED, suggesting that no long-range, ordered alloy structure was formed. Zn atoms were substitutionally incorporated into the Pt(111) crystal to form a near-surface alloy in which Zn atoms were found to reside primarily in the topmost and second layers. The alloyed Zn atoms in the topmost layer are coplanar with the Pt atoms in the surface layer, without any "buckling" of Zn, that is, displacement in the vertical direction. This result is expected because of the similar size of Pt and Zn, based on previous studies of bimetallic Pt alloys. Zn atoms desorb upon heating rather than diffusing deep into the bulk of the Pt crystal. Temperature programmed desorption (TPD) measurements show that both CO and NO have lower desorption energies on the PtZn alloy surface compared to that on the clean Pt(111) surface.

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Probing the structures of bimetallic Sn/Rh(111) surfaces: Alkali-ion scattering and x-ray photoelectron diffraction studies

Cited by 32 publications

References 22 publications

Growth and structure of an ultrathin tin oxide film on Rh(111)

Growth and structure of an ultrathin tin oxide film on Rh(111)

Suppressed surface alloying for a bulk miscible system: Ge on Pt(100)

Alloy Formation and Chemisorption at Zn/Pt(111) Bimetallic Surfaces Using Alkali ISS, XPD, and TPD

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