Initial oxidation of Ni(111) observed by electron emission microscopy: PEEM and MEEM

Sogo, M.; Kamada, Toshihiko; Aoki, Masaru; Masuda, S.

doi:10.1016/j.susc.2007.04.048

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…Much of the recent research in developing experimental techniques and atomistic simulation models to predict the mechanism of nanoscale oxide growth is motivated by the goal of controlling the oxide structure and morphology while reducing the thickness of the oxide layer in these devices to the nanometer range or even a single monolayer . Oxide growth, which is speculated to be a diffusion-controlled phenomenon, could generate complex surfaces with nonuniform fractal features making it very difficult to exercise control over their structural evolution . This is mainly attributed to the complexity of surface oxidation and the complex interplay between several key reaction steps and numerous dynamic processes occurring on the substrates including nucleation and surface diffusion which are not yet fully understood …”

Section: Introductionmentioning

confidence: 99%

“…Several fundamental questions concerning the key steps that are involved in low temperature oxidation and surface oxide growth, especially in the presence of electric fields, are still unanswered. In particular, the exact role of the oxygen surface dynamics (oxygen uptake, oxide nucleation, and surface diffusion kinetics) in governing the appearance and surface coverage of the nanoscale oxide patterns is poorly understood. ,, In view of these complexities, atomic level control of ultrathin surface oxide structure and morphology still represents a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

“…10 Oxide growth, which is speculated to be a diffusion-controlled phenomenon, could generate complex surfaces with nonuniform fractal features making it very difficult to exercise control over their structural evolution. 11 This is mainly attributed to the complexity of surface oxidation and the complex interplay between several key reaction steps and numerous dynamic processes occurring on the substrates including nucleation and surface diffusion which are not yet fully understood. 12 According to Holloway and Hudson, 13 oxides form on Ni via the nucleation and lateral growth of islands of oxide which are approximately two to three "layers" of oxide thick.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the exact role of the oxygen surface dynamics (oxygen uptake, oxide nucleation, and surface diffusion kinetics) in governing the appearance and surface coverage of the nanoscale oxide patterns is poorly understood. 10,11,15 In view of these complexities, atomic level control of ultrathin surface oxide structure and morphology still represents a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

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Electric Field Control of Surface Oxygen Dynamics and its Effect on the Atomic Scale Structure and Morphology of a Growing Ultrathin Oxide Film

Sankaranarayanan

Ramanathan

2010

J. Phys. Chem. C

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Controlled manipulation of oxide microstructure and morphology is critical to achieve the desired chemical activity in a variety of applications involving nanoscale metal oxides. The kinetics of surface oxide growth is strongly correlated to the microstructure of the developing oxide film, i.e., structure, morphology, and chemical composition. Controlling oxide microstructure and surface oxide coverage in the case of discontinuous oxide growth on metal substrates exhibiting slow oxidation kinetics remains a major challenge. In this study, molecular dynamics simulations employing dynamic charge transfer between atoms is used to investigate the initial stages of natural and electric field assisted oxidation of Ni(100) at room temperature. Surface oxygen dynamics determines the formation and evolution of the oxide domains. The increase in oxygen uptake under electric fields enhances oxide nucleation. Atomistic simulations also indicate that the surface diffusion of adsorbed oxygen can be controlled by the applied electric field and utilized to tune the growing oxide structure and morphology. In the postnucleation stage, the enhanced surface diffusion of oxygen atoms leads to a more rapid oxide growth at the perimeter of the oxide nuclei which results in a more uniform and increased nickel oxide surface coverage. The general strategy of electric field controlled oxygen incorporation and oxide growth may find wide applications in complex oxide thin film and heterostructure synthesis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electric Field Control of Surface Oxygen Dynamics and its Effect on the Atomic Scale Structure and Morphology of a Growing Ultrathin Oxide Film

Sankaranarayanan

Ramanathan

2010

J. Phys. Chem. C

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“…Various aspects of the interaction between Ni surfaces and oxygen species have been examined by means of different experimental and theoretical techniques. [8][9][10][11][12][13][14][15][16][17][18][19] The oxidation of Ni substrate via thermal oxygen species was addressed as the main concern of the scientific literature on the corresponding subject. However, hyperthermal oxidation has been less studied and requires comprehensive studies on the hyperthermal oxidation of Ni surfaces.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of nickel surfaces through the energetic impacts of oxygen molecules: Reactive molecular dynamics simulations

Amiri

Behnejad

2016

The Journal of Chemical Physics

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Molecular dynamics approach accompanied by reactive force field is used to study the characteristics of the oxide growth process on Ni(100) and Ni(111) surfaces at the temperatures of 300, 600, and 900 K and 5 eV as the energy of the O2 impacts. The exposure of Ni surfaces to the high-energy O2 impacts indicates that the primary oxide nuclei can be formed on any impact site. The results of kinetic studies clarify that the oxide growth kinetics cannot be accurately explained with the island growth model and increasing the surface temperature raises failure of the model. Under the present conditions, the growth kinetics is found to obey a Langmuir growth model. Increasing the surface temperature from 300 to 900 K results in ∼18.75% and ∼23% more oxygen consumption by (100) and (111) surfaces of Ni, respectively. The structure of nickel oxide (NiO) film formed after 200 successive O2 impacts per surface super-cell is investigated utilizing radial distribution functions and oxygen density profiles. These calculations demonstrate that the structure of the formed NiO film is amorphous. Moreover, the charge profiles in Ni/NiO system are illustrated and discussed.

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Applications in Surface Science

Bauer

2014

Surface Microscopy With Low Energy Electrons

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Initial oxidation of Ni(111) observed by electron emission microscopy: PEEM and MEEM

Cited by 7 publications

References 16 publications

Electric Field Control of Surface Oxygen Dynamics and its Effect on the Atomic Scale Structure and Morphology of a Growing Ultrathin Oxide Film

Electric Field Control of Surface Oxygen Dynamics and its Effect on the Atomic Scale Structure and Morphology of a Growing Ultrathin Oxide Film

Oxidation of nickel surfaces through the energetic impacts of oxygen molecules: Reactive molecular dynamics simulations

Applications in Surface Science

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