Lattice vibrations and stability of reconstructed (110) noble metal surfaces

Vilfan, I.; Lançon, Frédéric; Adam, Erwan

doi:10.1016/s0039-6028(99)00822-5

Cited by 15 publications

(6 citation statements)

References 22 publications

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“…The formers lie 0.8 Å above the top Ag atoms and are not resolved in the STM image, while the and protrude out of the surface by 1.4 and 1.1 Å thus leading to the six bump structure in the simulated image with the at the centre appearing brighter. Therefore, although the nano-dot shows marked differences with respect to the extended NRs, its structure already accounts for the presence of two distinct types of Si atoms at the surface (Si s and Si ad ) and confirms the tendency of the Ag(110) surface to remove top row silver atoms on Si adsorption 22 26 , as could be expected from the low stability of this particular surface 27 28 .…”

Section: Resultssupporting

confidence: 65%

Unveiling the pentagonal nature of perfectly aligned single-and double-strand Si nano-ribbons on Ag(110)

et al. 2016

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Carbon and silicon pentagonal low-dimensional structures attract a great interest as they may lead to new exotic phenomena such as topologically protected phases or increased spin–orbit effects. However, no pure pentagonal phase has yet been realized for any of them. Here we unveil through extensive density functional theory calculations and scanning tunnelling microscope simulations, confronted to key experimental facts, the hidden pentagonal nature of single- and double-strand chiral Si nano-ribbons perfectly aligned on Ag(110) surfaces whose structure has remained elusive for over a decade. Our study reveals an unprecedented one-dimensional Si atomic arrangement solely comprising almost perfect alternating pentagons residing in the missing row troughs of the reconstructed surface. We additionally characterize the precursor structure of the nano-ribbons, which consists of a Si cluster (nano-dot) occupying a silver di-vacancy in a quasi-hexagonal configuration. The system thus materializes a paradigmatic shift from a silicene-like packing to a pentagonal one.

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Section: Resultssupporting

confidence: 65%

Unveiling the pentagonal nature of perfectly aligned single-and double-strand Si nano-ribbons on Ag(110)

et al. 2016

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“…The two-step disordering theory by Villain and Vilfan is consistent with most recently X-ray scattering study [27]. The more comprehensive data one can find in the recent review [2,7,8] or in the appropriate references in the present paper [35][36][37][38][39][40][41][42][43][44].…”

Section: Theoretical Studiessupporting

confidence: 86%

Surface Reconstruction: Noble Metals

2001

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The paper reviews the most important achievements in the study of the surfacereconstruction phase transition on the low-index single crystals of Pt, Ir, and Au. A number of methods very sensitive to the surface layers are used to study the stable and metastable structures of the (100), (110), and (111) faces. Detailed consideration of the kinetics, critical parameters, activation energy, and geometrical models for 2D-surface phase transitions are presented. Main theoretical results based on the Ising 2D-model, calculations of the free energy with an embedded-atom method, and equilibrium Monte Carlo simulations are also given. В обзоре рассмотрены последние достижения в исследовании реконструкционных фазовых превращений в поверхностных слоях монокристаллов Pt, Ir и Au. Приведены результаты, полученные с помощью различных поверхностно-чувствительных экспериментальных методов. Наиболее подробно рассмотрены вопросы, относящиеся к кинетике, энергии активации, геометрическим моделям, критическим параметрам 2D-фазовых превращений. Представлены также результаты теоретических исследований, основанных на 2D-модели Изинга, методе внедренного атома и моделировании методом Монте-Карло. В обзорі розглянуто останні досягнення в дослідженні реконструкційніх фазових перетворень в поверхневих шарах монокристалів Pt, Ir та Au. Наведено результати, які отримані за допомогою різних повехнево-чутливих експериментальних методів. Найбільш детально розглянуто питання, що відносяться до кінетики, енергії активації, геометричних моделей, критичних параметрів 2D-фазових перетворень. Представлено також результати теоретичних досліджень, що базовані на 2D-моделі Ізінга, методі зануреного атому та моделюванні за методом Монте-Карло.

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“…Increasing demolding temperature leads to higher reflow velocity, commensurable to h 0 /s. On the one hand, it should be noticed that surface free energy is not supposed to vary so much between T g +20°C and T g +50°C [7]. On the other hand, reflowing velocity is almost two decades faster at T g +50°C than at T g +20°C.…”

Section: Mechanical Analysismentioning

confidence: 95%

Optimization of demolding temperature for throughput improvement of nanoimprint lithography

Leveder

Landis

Davoust

et al. 2007

Microelectronic Engineering

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Annealing effects onto the reflow of imprinted resist patterns have been investigated on 250 nm dense line arrays printed with standard hot embossing lithography and thermoplastic polymer. Atomic force microscopy measurements were performed to point out the annealing temperature and time effects, respectively. The reflow velocity with respect to annealing temperature has been determined. Its variation is ascribed to both resist dynamic viscosity and surface free energy. Our approach demonstrated that imprint cycle time could be significantly reduced by saving cooling down time.

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Lattice vibrations and stability of reconstructed (110) noble metal surfaces

Cited by 15 publications

References 22 publications

Unveiling the pentagonal nature of perfectly aligned single-and double-strand Si nano-ribbons on Ag(110)

Unveiling the pentagonal nature of perfectly aligned single-and double-strand Si nano-ribbons on Ag(110)

Surface Reconstruction: Noble Metals

Optimization of demolding temperature for throughput improvement of nanoimprint lithography

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