Structural and electronic studies of supported Pt and Au epitaxial clusters on tungsten oxide surface

Mašek, K.; Blumentrit, P.; Beran, Jan; Škála, Tomáš; Píš, Igor; Polášek, Jan; Matolín, Vladimı́r

doi:10.1016/j.vacuum.2011.07.021

Cited by 13 publications

(6 citation statements)

References 25 publications

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“…This can partly be rationalized by the relatively high fraction of Au atoms located at the surface–vacuum interface. Note that the surface core level shift (SCLS) for Au was found to be −0.4 eV. , Another factor contributing to the observed low binding energy can be the interaction of Rh with Au, possibly involving charge transfer from Rh to Au. Upon alloying of gold with platinum the Au 4f 7/2 binding energy shifted down by 0.5 eV, and it was identified at 83.5 eV .…”

Section: Resultsmentioning

confidence: 99%

“…Note that the surface core level shift (SCLS) for Au was found to be −0.4 eV. , Another factor contributing to the observed low binding energy can be the interaction of Rh with Au, possibly involving charge transfer from Rh to Au. Upon alloying of gold with platinum the Au 4f 7/2 binding energy shifted down by 0.5 eV, and it was identified at 83.5 eV . Annealing our surface to 700 K led to the appearance of a Ti 2p signal, indicating that Ti diffused into the information depth of XPS.…”

Section: Resultsmentioning

confidence: 99%

“…The growth and thermal effects were previously addressed also for Pt–Au clusters supported by TiO 2 (110) − or by other reducible oxides. , In case of the TiO 2 (110) substrate the results were slightly diverging, and showed a size dependent behavior. In ref peak fitting was applied because of the very close positions of Pt and Au LEIS contributions, leading the authors to conclude that at the small total metal coverage of 0.1 monolayers (ML) and cluster height of 0.5–1 nm the surface of bimetallic clusters was mixed and surprisingly even enriched in Pt, in spite of the low bulk solubility and the low surface energy of Au.…”

Section: Introductionmentioning

confidence: 97%

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Effect of a Gold Cover Layer on the Encapsulation of Rhodium by Titanium Oxides on Titanium Dioxide(110)

Óvári¹,

Berkó²,

Gubó

et al. 2014

J. Phys. Chem. C

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The present study focuses on the thermal behavior of continuous rhodium thin films (∼10 nm) deposited on a TiO 2 (110) substrate at 300 K and covered by a continuous ultrathin gold film (∼1 nm), applying scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and low-energy ion scattering (LEIS) techniques. This arrangement facilitated a rather clear-cut investigation into the effect of the Au cover layer on the wellknown encapsulation/decoration of Rh by TiO x , since the contribution of the titania substrate to the XPS and LEIS spectra could be avoided. Upon annealing a monometallic Rh film, the diffusion of Ti and O from the TiO 2 (110) substrate on top of the Rh film is essentially complete up to 850 K, leading characteristically to the formation of a "pinwheel" encapsulation layer with a TiO 1.2 stoichiometry. The dewetting of the Rh film does not take place up to 950 K. Upon annealing of the Rh film in the presence of a continuous Au cover layer, the diffusion/accumulation of O was completely blocked up to 850 K, but metallic Ti was well detectable by XPS. Since LEIS spectra were dominated by the Au peak, and almost no Ti signal was observable up to this temperature, the metallic Ti is mainly stabilized at subsurface positions, probably either at the Rh−Au interface or within the Au film, in any case in contact with Au. The complete separation of O and Ti diffusion in this temperature range can be attributed to the weak interaction between oxygen and gold. Raising the sample temperature up to 930 K induces substantial changes. The diffusion of O is no longer kinetically hindered, and it reacts with a part of the alloyed Ti to form wellseparated TiO 2 nanoclusters on top of the Au shell. However, no oxygen is stabilized at subsurface sites in the bimetallic film. The rest of Ti alloyed in the subsurface is detectable by STM as ringlike features. The "pinwheel" TiO 1.2 encapsulation layer appearing typically on a pure Rh film did not form on the bimetallic Au−Rh film at any of the temperatures investigated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Effect of a Gold Cover Layer on the Encapsulation of Rhodium by Titanium Oxides on Titanium Dioxide(110)

Óvári¹,

Berkó²,

Gubó

et al. 2014

J. Phys. Chem. C

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“…Therefore, they allow one to study how physical and chemical properties change in transition from an isolated molecule to a condensed phase. Interest in small metallic clusters has grown dramatically in the past few decades [1, 2, 3, 4, 5, 6, 7, 8] and since aluminum is a common and cheap metal, its clusters are probably the most studied systems among the other metallic clusters [9, 10, 11, 12, 13]. Atomic clusters that exhibit some properties of elemental atoms are called superatoms.…”

Section: Introductionmentioning

confidence: 99%

Computational screening of carbon monoxide (CO) adsorption over neutral and charged Al7 clusters

Abdeveiszadeh

Shakerzadeh

Noorizadeh

2019

Heliyon

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A density functional theory study on the structures and chemical bonding of charged (Al 7 + and Al 7 − ) and neutral Al 7 clusters is presented. A distorted octahedral structure with an aluminum atom decorating one of the aluminum faces of the octahedron is predicted for these clusters. The AdNDP analysis reveals double (σ- and π-) aromatic and antiaromatic characteristics of Al 7 + and Al 7 − clusters, respectively. The UV-Vis Spectra of these clusters are also investigated using TD-DFT method. The molecular adsorption of carbon monoxide on the mentioned clusters is also explored. It is found that, the binding of CO through its carbon atom on considered clusters is a physical adsorption and Al 7 − cluster shows the most tendency for the CO adsorption. The NBO analysis and density of states spectra confirm the weak interaction between carbon atom of CO and the aluminum atom of these clusters.

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“…It is difficult to distinguish component contribution of binding energy (BE). The possibility to experimentally distinguish coordination and compounds with different chemical reactivity would be relevant also for the architectural design and engineering of core-shell nanoparticles, where only one type of skin solid metal is present, but the electronic structure and catalytic properties are substantially modified because of the interaction of the shell atoms with the core atoms [23][24][25][26][27][28][29][30]. Therefore, a method of purifying the surface and interface information about atomic bond and electronic is highly desired.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and binding energy relaxation of ScZr atomic alloying

Guo

Yang

et al. 2016

Chemical Physics Letters

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Structural and electronic studies of supported Pt and Au epitaxial clusters on tungsten oxide surface

Cited by 13 publications

References 25 publications

Effect of a Gold Cover Layer on the Encapsulation of Rhodium by Titanium Oxides on Titanium Dioxide(110)

Effect of a Gold Cover Layer on the Encapsulation of Rhodium by Titanium Oxides on Titanium Dioxide(110)

Computational screening of carbon monoxide (CO) adsorption over neutral and charged Al7 clusters

Electronic structure and binding energy relaxation of ScZr atomic alloying

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