Surface alloying of immiscible metals: Mo on Au(111) studied by STM

Biener, Monika M.; Biener, Juergen; Schalek, Richard; Friend, Cynthia M.

doi:10.1016/j.susc.2005.07.028

Cited by 54 publications

(50 citation statements)

References 40 publications

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“…This work builds on our earlier studies of the growth of MoO 3 on Au(111) [15][16][17][18]. Herein, we demonstrate that we are able to generalize the growth of metal oxide nanostructures on the reconstructed Au(111)-"herringbone" surface to TiO 2 , which is a three-dimensional metal oxide.…”

Section: Introductionsupporting

confidence: 56%

“…The elbow sites of the herringbone reconstruction serve as selective nucleation sites for the growth of titanium islands. The preferential nucleation of metals at the elbow sites of the herringbone reconstruction is a common phenomenon and was previously reported for Ni, Co, Mo and Fe [18][19][20][21][22][23]. The results regarding Ti deposition on Au(111) will be published in more detail elsewhere [25].…”

Section: Resultsmentioning

confidence: 68%

“…Herein, we demonstrate that we are able to generalize the growth of metal oxide nanostructures on the reconstructed Au(111)-"herringbone" surface to TiO 2 , which is a three-dimensional metal oxide. Previous studies of Ni [19], Fe [20], Co [21], and Mo [18,22,23] on Au(111) show that metal particles nucleate at the elbow sites of the herringbone reconstruction of the gold surface when deposited via physical vapor deposition (PVD). In the case of Mo, metallic nanoparticles have been converted to two-dimensional nanocrystalline MoS 2 [22] and MoO 3 particles [16], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies of Ni [19], Fe [20], Co [21], and Mo [18,22,23] on Au(111) show that metal particles nucleate at the elbow sites of the herringbone reconstruction of the gold surface when deposited via physical vapor deposition (PVD). In the case of Mo, metallic nanoparticles have been converted to two-dimensional nanocrystalline MoS 2 [22] and MoO 3 particles [16], respectively. The objective of the work presented here was to systematically synthesize and characterize titanium oxide nanoparticles on reconstructed Au(111) surfaces which may then be used as models for reactivity studies of isolated oxide nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of TiO2 nanoparticles on the Au(111) surface

Biener

Farfan-Arribas

Biener

et al. 2005

The Journal of Chemical Physics

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The growth of titanium oxide nanoparticles on reconstructed Au(111) surfaces was investigated by scanning tunneling microscopy and X-ray photoelectron spectroscopy. Ti was deposited by physical vapor deposition at 300 K. Regular arrays of titanium nanoparticles form by preferential nucleation of Ti at the elbow sites of the herringbone reconstruction. Titanium oxide clusters were synthesized by subsequent exposure to O 2 at 300 K. Two-and three-dimensional titanium oxide nanocrystallites form during annealing in the temperature range from 600 to 900 K. At the same time, the Au(111) surface assumes a serrated, <110> oriented step-edge morphology, suggesting step-edge pinning by titanium oxide nanoparticles. The oxidation state of these titanium oxide nanoparticles varies with annealing temperature. Specifically, annealing to 900 K results in the formation of stoichiometric TiO 2 nanocrystals as judged by the observed XPS binding energies. Nano-dispersed TiO 2 on Au(111) is an ideal system to test the various models explaining the enhanced catalytic reactivity of supported Au nanoparticles. IntroductionMetal oxides are of considerable interest because of their technological importance, e.g. in the field of heterogeneous catalysis, where they are used as catalyst supports for a wide variety of metals. The interaction of the adsorbed metal particles with the oxide support is complex and gives rise to interesting phenomena such as the strong metal support interaction (SMSI). This term describes the change in catalytic activity (favoring hydrogenation) observed when group VIII B metals supported on reducible oxides (TiO 2 , TaO 5 , CeO 2 , NbO) are annealed in a reducing atmosphere [1]. Transition metal oxides are also used to support other oxides in the socalled monolayer catalysts. For example, V 2 O 5 /TiO 2 systems are used for the partial oxidation of methanol, and have been extensively studied in single crystal as well as in powder form [2][3][4][5].

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Section: Introductionsupporting

confidence: 56%

Section: Resultsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of TiO2 nanoparticles on the Au(111) surface

Biener

Farfan-Arribas

Biener

et al. 2005

The Journal of Chemical Physics

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“…The system is equipped with commercial instrumentation for STM, AES and LEED, and details of the experimental setup are published elsewhere [8]. The purity of both, O 2 (Matheson, research purity grade) and SO 2 (Matheson, anhydrous grade) was periodically checked with a residual gas analyzer.…”

Section: Methodsmentioning

confidence: 99%

Enhanced transient reactivity of an O-sputtered Au(111) surface

Biener

Friend

2005

Surface Science

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The interaction of SO 2 with oxygen-sputtered Au(111) surfaces (θ oxygen ≤ 0.35 ML) was studied by monitoring the oxygen and sulfur coverages as a function of SO 2 exposure. Two reaction regimes were observed: oxygen depletion followed by sulfur deposition. An enhanced, transient sulfur deposition rate is observed at the oxygen depletion point. This effect is specifically pronounced if the Au surface is continuously exposed to SO 2 . The enhanced reactivity towards S deposition seems to be linked to the presence of highly reactive, under-coordinated Au atoms. Adsorbed oxygen appears to stabilize, but also to block these sites. In absence of the stabilization effect of adsorbed oxygen, i.e. at the oxygen depletion point, the enhanced reactivity decays on a timescale of a few minutes. These observations shed a new light on the catalytic reactivity of highly dispersed gold nanoparticles.2

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Nucleation, Growth, and Organization of Metal Nanoparticles on Oxide Surfaces

Henry¹,

Becker²

2014

Surface and Interface Science

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Surface alloying of immiscible metals: Mo on Au(111) studied by STM

Cited by 54 publications

References 40 publications

Synthesis of TiO2 nanoparticles on the Au(111) surface

Synthesis of TiO2 nanoparticles on the Au(111) surface

Enhanced transient reactivity of an O-sputtered Au(111) surface

Nucleation, Growth, and Organization of Metal Nanoparticles on Oxide Surfaces

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