Energetic regimes and growth mechanisms of pulsed laser deposited Pd clusters on Au(111) investigated by<i>in situ</i>scanning tunneling microscopy

Casari, Carlo Spartaco; Foglio, S.; Passoni, M.; Siviero, F.; Bottani, C. E.; Bassi, Andrea

doi:10.1103/physrevb.84.155441

Cited by 11 publications

(4 citation statements)

References 52 publications

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“…However, in the case a diffusion barrier exists at the edge of an island 38,58 , the sticking of the new cluster on the preformed island is irreversible, and the evolution of surface coverage no longer follows a proportionality law with respect to the deposition time (or number of clusters deposited). In this case, the evolution of the surface coverage (θ) with time is described by an exponential law 58,60 :…”

Section: B Evolution Of the Surface Coveragementioning

confidence: 99%

Growth Mechanism of Cluster-Assembled Surfaces: From Submonolayer to Thin-Film Regime

et al. 2018

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Nanostructured films obtained by the assembling of preformed atomic clusters are of strategic importance for a wide variety of applications. The deposition of clusters produced in the gas phase onto a substrate offers the possibility to control and engineer the structural and functional properties of the cluster-assembled films. To date the microscopic mechanisms underlying the growth and structuring of cluster-assembled films are poorly understood, and in particular the transition from the sub-monolayer to the thin film regime is experimentally unexplored. Here we report the systematic characterization by Atomic Force Microscopy of the evolution of the structural properties of cluster-assembled films deposited by Supersonic Cluster Beam Deposition. As a paradigm of nanostructured systems, we have focused our attention on cluster-assembled zirconia films, investigating the influence of the building blocks dimensions on the growth mechanisms and on the roughening of the thin films, following the growth process from the early stages of the sub-monolayer to the thin film regime. Our results demonstrate that the growth dynamics in the sub-monolayer regime determines different morphological properties of the cluster-assembled thin film. The evolution of roughness with the number of deposited clusters reproduces exactly the growth exponent of the ballistic deposition in the 2+1 model, from the sub-monolayer to the thin film regime.

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Section: B Evolution Of the Surface Coveragementioning

confidence: 99%

Growth Mechanism of Cluster-Assembled Surfaces: From Submonolayer to Thin-Film Regime

et al. 2018

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“…based on thermal or e-beam evaporation. However, PLD is a versatile technique which has proved to be effective for fundamental investigation of simple model systems [30] as well as for the development of scalable approaches for the synthesis of 2D materials, such as graphene [31], transition metal dichalcogenides [32,33] and hexagonal boron nitride [34]. Our experiments explore the applicability of such approach in the investigation of the first stages of growth of 2D ZnO, starting from a sub-monolayer coverage.…”

Section: Introductionmentioning

confidence: 99%

Pulsed laser deposition of two-dimensional ZnO nanocrystals on Au(111): growth, surface structure and electronic properties

Tumino¹,

Casari²,

Passoni³

et al. 2016

Nanotechnology

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Two-dimensional (2D) ZnO structures have been deposited on the Au(111) surface by means of the pulsed laser deposition technique. In situ scanning tunneling microscopy and scanning tunneling spectroscopy measurements have been performed to characterize morphological, structural and electronic properties of 2D ZnO at the nanoscale. Starting from a sub-monolayer coverage, we investigated the growth of ZnO, identifying different atomic layers (up to the fifth). At low coverage, we observed single- and bi-layer nanocrystals, characterized by a surface moiré pattern that is associated to a graphene-like ZnO structure. By increasing the coverage, we revealed a morphological change starting from the fourth layer, which was attributed to a transition toward a bulk-like structure. Investigation of the electronic properties revealed the semiconducting character of 2D ZnO. We observed a dependence of the density of states (DOS) and, in particular, of the conduction band (CB) on the ZnO thickness, with a decreasing of the CB onset energy for increasing thickness. The CB DOS of 2D ZnO shows a step-like behaviour which may be interpreted as due to a 2D quantum confinement effect in ZnO atomic layers.

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“…On the other hand, at lower pressures (i.e. 10 Pa) in plume cluster nucleation phenomena are reduced promoting growth phenomena only by surface diffusion and coarsening[36,37]. Hence, NPs growth is controlled by two different mechanisms, namely in-plume cluster nucleation and surface diffusion, which respectively dominate at high (> 300 Pa) and low (≤ 300 Pa) pressures.…”

mentioning

confidence: 99%

Engineering plasmonic nanostructured surfaces by pulsed laser deposition

Ghidelli

Mascaretti

Bricchi

et al. 2018

Applied Surface Science

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The synthesis and the optical response of gold nanoparticles (NPs) and thin nanostructured films grown by pulsed laser deposition (PLD) are here studied. Different PLD process parameters-including background gas pressure and the number of laser shots as well as post-deposition annealing treatments-have been varied to control the growth of Au NPs and films, thus tuning the surface plasmon characteristics. The mechanisms of NPs and film growth have been explored performing a morphological characterization by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM), and the correlation with the optical behavior is investigated. We show that the size distribution and the morphology of the as deposited Au NPs depend on growth mechanisms which are controlled by tuning the deposition process, while the optical behavior is strongly affected by the average size and surface density of NPs or by the length of percolated Au domains. Furthermore, nucleation in gas phase has been reported at high (1000 Pa Ar) background pressures, enabling independent control of NP size and coverage, contrary to surface driven NP growth by diffusion and aggregation on substrate.

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Energetic regimes and growth mechanisms of pulsed laser deposited Pd clusters on Au(111) investigated byin situscanning tunneling microscopy

Cited by 11 publications

References 52 publications

Growth Mechanism of Cluster-Assembled Surfaces: From Submonolayer to Thin-Film Regime

Growth Mechanism of Cluster-Assembled Surfaces: From Submonolayer to Thin-Film Regime

Pulsed laser deposition of two-dimensional ZnO nanocrystals on Au(111): growth, surface structure and electronic properties

Engineering plasmonic nanostructured surfaces by pulsed laser deposition

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