The influence of sulfur adsorption on the step structure of vicinal Mo(100): a LEED and STM study

Dunphy, J.C.; Knight, Colette C.; Sautet, Philippe; Ogletree, D. Frank; Somorjai, Gábor A.; Salmerón, Miquel

doi:10.1016/0039-6028(93)90684-c

Cited by 23 publications

(3 citation statements)

References 24 publications

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“…Some of the experimental studies focused on the structure and stability of high-Miller-index surfaces during adsorption [5][6][7][8]; others investigated surface reconstructions [9][10][11][12][13] or surface relaxations [14]. The importance of high-Miller-index surfaces (or "vicinal" surfaces as they are frequently called) in surface science was acknowledged by introducing a special notation such that the structure of the denoted crystal planes could be recognized straight forwardly just by their notation (sometimes denoted as the "Somorjai notation") [15].…”

Section: Introductionmentioning

confidence: 99%

Step dynamics and step–step interactions on the chiral Cu(5 8 90) surface

Giesen

Dieluweit

2004

Journal of Molecular Catalysis A: Chemical

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Section: Introductionmentioning

confidence: 99%

Step dynamics and step–step interactions on the chiral Cu(5 8 90) surface

Giesen

Dieluweit

2004

Journal of Molecular Catalysis A: Chemical

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“…Surface defects exist extensively on many metal and semiconductor surfaces. Surface defects such as steps, vacancies and kinks play a significant role in surface adsorption [1][2][3][4][5][6], epitaxial growth [7,8] and surface diffusion [9,10]. However, the study of surface defects is experimentally and theoretically difficult.…”

Section: Introductionmentioning

confidence: 99%

Acetylene adsorption studies on Pd(111) and stepped Pd(111)

Lee

Cao

1996

J. Phys.: Condens. Matter

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The adsorption of acetylene on Pd(111) and stepped Pd(111) surfaces as well as the influence and mechanism of a monatomic step have been investigated by theoretical calculations. On ideal Pd(111), the favourite acetylene adsorption site is the threefold hollow site. Our calculated geometry configuration and vibrational frequencies of adsorbed acetylene are consistent with previous studies. Generally speaking, steps have active effects, zero effects or inactive effects in the adsorption process. For acetylene on stepped Pd(111), a monatomic step as the active site makes the C - C bond of acetylene further weakened. Acetylene adsorption geometry in the second case (C - C bond axis tilts to the surface normal and the molecular plane is vertical to the step direction) is similar to that of the molecule on the Pd(110) surface because of the (110) structure of the step. Furthermore, the vibrational frequencies of acetylene are also in agreement with the results of HREELS studies of acetylene on Pd(110).

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“…However, if the surface is poisoned by carbon monoxide (1−5 mTorr), the reactions stop and ordered structures become visible (Figure ). It is also well-known from vacuum surface science that adsorbates induce structural reconstructions on clean surfaces. − That is why our efforts subsequently concentrated on pure CO, which is an important reactant in industrial catalytic reactions and is known to strongly bind to platinum. The adsorption of CO was monitored on two stepped platinum surfaces, Pt(557) and Pt(332), formed by six atom wide terraces of (111) orientation separated by monatomic steps of a (100) type square cell for Pt(557) and a (111) type triangular cell for Pt(332).…”

Section: High Pressure Scanning Tunneling Microscopy (Hp-stm) Mobilit...mentioning

confidence: 99%

Molecular Studies of Model Surfaces of Metals from Single Crystals to Nanoparticles under Catalytic Reaction Conditions. Evolution from Prenatal and Postmortem Studies of Catalysts

Somorjai

Aliaga

2010

Langmuir

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Molecular level studies of metal crystal and nanoparticle surfaces under catalytic reaction conditions at ambient pressures during turnover were made possible by the use of instruments developed at the University of California at Berkeley. Sum frequency generation vibrational spectroscopy (SFGVS), owing to its surface specificity and sensitivity, is able to identify the vibrational features of adsorbed monolayers of molecules. We identified reaction intermediates, different from reactants and products, under reaction conditions and for multipath reactions on metal single crystals and nanoparticles of varying size and shape. The high-pressure scanning tunneling microscope (HP-STM) revealed the dynamics of a catalytically active metallic surface by detecting the mobility of the adsorbed species during catalytic turnover. It also demonstrated the reversible and adsorbate-driven surface restructuring of platinum when exposed to molecules such as CO and ethylene. Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) detected the reversible changes of surface composition in rhodium-palladium, platinum-palladium, and other bimetallic nanoparticles as the reactant atmosphere changed from oxidizing to reducing. It was found that metal nanoparticles of less than 2 nm in size are present in higher oxidation states, which alters and enhances their catalytic activity. The catalytic nanodiode (CND) confirmed that a catalytic reaction-induced current flow exists at oxide-metal interfaces, which correlates well with the reaction turnover.

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The influence of sulfur adsorption on the step structure of vicinal Mo(100): a LEED and STM study

Cited by 23 publications

References 24 publications

Step dynamics and step–step interactions on the chiral Cu(5 8 90) surface

Step dynamics and step–step interactions on the chiral Cu(5 8 90) surface

Acetylene adsorption studies on Pd(111) and stepped Pd(111)

Molecular Studies of Model Surfaces of Metals from Single Crystals to Nanoparticles under Catalytic Reaction Conditions. Evolution from Prenatal and Postmortem Studies of Catalysts

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