Size-dependent reactivity of self-organized nanostructured O/Cu(110) surfaces towards H2S

Poulain, Clément; Budinská, Zuzana; Wiame, Frédéric; Maurice, Vincent; Marcus, Philippe

doi:10.1016/j.susc.2016.07.002

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…These chains lie in the troughs along the [11̅0] direction. The chains react with CO, ,,, water, − methanol, − formic acid, CO 2 , H 2 S, , ammonia, and benzotriazole . Generally speaking, despite nuances in the structure of the oxygen chains, oxygen atoms on the periphery of chain groups are all reactive, with oxygen atoms on the terminal sites of the chains ([11̅0] ends) being more reactive than those on the side of the chains. ,,,,,, Defect sites and the reaction temperature ,, also play an important role.…”

Section: Resultsmentioning

confidence: 99%

Spatially Nonuniform Reaction Rates during Selective Oxidation on Gold

Madix

Friend

2018

J. Am. Chem. Soc.

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The nonuniform reactivity of adsorbed oxygen during the selective oxidation of methanol on Au(110)-(1×2) was demonstrated using in situ scanning tunneling microscopy (STM), establishing the importance of both atomic and mesoscale structure in determining reaction kinetics. At coverages above 0.06 ML, oxygen consumption occurs preferentially along [11̅0] direction, creating local regions completely devoid of oxygen between oxygen islands. The directionally specific reactivity is attributed to a combination of the weaker binding of oxygen atoms at chain termini and the release of surface strain induced by O bonding to Au. The generality of this phenomenon is illustrated by analogous, but kinetically contrasting behavior, for reaction of 2-propanol with oxygen covered Au(110)-(1×2). Even at low O coverages, there are structurally related changes in the reactivity for the reaction with methanol. With decreasing O coverage, a slow reaction period is followed by a fast reaction period, the latter starting when oxygen coverage decreases to ∼0.06 monolayer, independent of the initial coverage. This increase in reactivity is attributed to a sudden destabilization of the island structure. These results demonstrate that both local and mesocale structures can affect reactivity.

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Section: Resultsmentioning

confidence: 99%

Spatially Nonuniform Reaction Rates during Selective Oxidation on Gold

Madix

Friend

2018

J. Am. Chem. Soc.

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“…The sample voltage was used as a reference for all gap voltages in the experiments. AFM measurements were conducted after a tip-modification process on a CuO/Cu(110) surface, following documented procedures. − The homemade AFM sensor, with a resonant frequency of 23 kHz and a quality factor of ∼2000, was set to oscillate at an amplitude of ∼200 pm for constant-height AFM imaging. AFM images were obtained with frequency shift (Δ f ) set-points between −13 and −3 Hz at a scanning speed of 10 nm/s and a resolution of 512 × 512 pixels.…”

Section: Methodsmentioning

confidence: 99%

Influence of Copper Surface Orientation on the Hydrogen-Bonded Assembly of 2-Methylbenzimidazole Molecules: A Comparative Study

Sun,

Lu,

Zhou

et al. 2024

J. Phys. Chem. C

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“…The dimensions of nanostructures may vary from hundreds of nanometers to a few nanometers. It is well known that the size effects in nanostructures are very significant and have to be taken into account (Poulain et al., 2017). Different mechanical theories have been developed to catch the size effect of structures in small scale, such as strain gradient theory (Fleck and Hutchinson, 1993), nonlocal stress theory (Eringen, 1972), nonlocal strain gradient theory (Khaniki and Hashemi, 2017a, 2017b; Khaniki et al., 2017; Rajasekaran and Khaniki, 2018), and modified couple stress theory (Yang et al., 2002).…”

Section: Introductionmentioning

confidence: 99%

Analyses of natural frequency and electromechanical behavior of flexoelectric cylindrical nanoshells under modified couple stress theory

Zeng

Wang

2018

Journal of Vibration and Control

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Different from piezoelectric effect, the flexoelectric effect is size dependent and becomes more significant at nanoscale. A nonlinear dynamic model of nanoscale flexoelectric shells is developed based on modified couples stress theory. The governing equations for nonlinear vibration of a flexoelectric cylindrical nanoshell are obtained. The natural frequency and generated voltage of the flexoelectric cylindrical nanoshell is achieved. Effects of geometric dimension, character material length, and vibration amplitude on the natural frequency and the generated voltage are discussed in detail. Results demonstrate that modified couple stress theory and large deformation theory are coupled together and interact with each other in the analyses of natural frequency and electromechanical behavior. Simultaneously taking nonlinearity and couple stress theory into account is necessary.

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Size-dependent reactivity of self-organized nanostructured O/Cu(110) surfaces towards H2S

Cited by 4 publications

References 29 publications

Spatially Nonuniform Reaction Rates during Selective Oxidation on Gold

Spatially Nonuniform Reaction Rates during Selective Oxidation on Gold

Influence of Copper Surface Orientation on the Hydrogen-Bonded Assembly of 2-Methylbenzimidazole Molecules: A Comparative Study

Analyses of natural frequency and electromechanical behavior of flexoelectric cylindrical nanoshells under modified couple stress theory

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