Bent graphite surfaces as guides for cluster diffusion and anisotropic growth

Schmidt, M.; Kébaı̈li, N.; Lando, Aurélie; Benrezzak, Sakina; Baraton, Laurent; Cahuzac, Ph.; Masson, A.; Bréchignac, C.

doi:10.1103/physrevb.77.205420

Cited by 16 publications

(26 citation statements)

References 22 publications

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“…3,4,11 Among other possible shapes, droplet-like and fractal islands have been observed in various systems. 3,4,[11][12][13] It was shown that the island morphology depends on various factors, such as the temperature, [3][4][5]14,15 particle size, 16 particle deposition rate, 5,17,18 substrate roughness, 19,20 concentration of impurities in the system, 4,14,21 and interparticle interaction energies. 4,5 It was also demonstrated that the patterns on a surface strongly depend on the type of the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 The growth process of fractals has been extensively studied in experiments. [17][18][19][20]28,29,31 In Refs. 17 and 18 a quantitative experimental study of spherical antimony cluster diffusion on graphite was performed.…”

Section: Introductionmentioning

confidence: 99%

“…The DLA model was used for a qualitative description of the process of fractal formation on a surface. 5,17,20,34 A two-dimensional theoretical model based on the DLA method has also been developed for the description of thermal relaxation of fractals on surfaces. 34 In this model particles are treated as immobile only if they are completely surrounded by other particles.…”

Section: Introductionmentioning

confidence: 99%

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Fragmentation pathways of nanofractal structures on surfaces

Dick

Solov’yov

2011

Phys. Rev. B

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We present a theoretical analysis of the post-growth processes occurring in nanofractals grown on a surface. For this study we have developed a method that accounts for the internal dynamics of particles in a fractal. We demonstrate that the detachment of particles from the fractal and their diffusion within the fractal and over the surface determines the shape of the islands remaining on a surface after the fractal fragmentation. We consider different scenarios of fractal post-growth relaxation and analyze the time evolution of the island's morphology. The results of our calculations are compared with available experimental observations, and experiments in which the post-growth relaxation of deposited nanostructures can be tested are suggested.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fragmentation pathways of nanofractal structures on surfaces

Dick

Solov’yov

2011

Phys. Rev. B

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“…In contrast, our recent experiment on silver cluster deposition on folded graphite shows evidence of repulsive barriers for convex bends. 2 On graphite surfaces, metal clusters of up to a few thousand atoms are known to be highly mobile. They aggregate into fractal islands 3,4 through an isotropic diffusion of clusters on flat terraces, which has been understood using a diffusion limited aggregation ͑DLA͒ model.…”

Section: Introductionmentioning

confidence: 99%

“…These pleats destroy the homogeneity of the graphite surface, which should affect cluster mobility and thus change the island patterns. 2 Understanding the role of the surface curvature on cluster mobility becomes of fundamental interest for building new architectures. However, nothing is known on the mechanism underlying the diffusion, and in particular the binding interaction between the cluster and folded graphite has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Curvature effect on the interaction between folded graphitic surface and silver clusters

et al. 2009

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Evidence of curvature effects on the interaction and binding of silver clusters on folded graphitic surfaces has been shown from both experiment and theory. Density functional theory ͑DFT͒ calculations within the local density and generalized gradient approximations have been performed for the structural relaxation of both Ag and Ag 2 on curved surfaces, showing a crossover from chemical to physical behavior. Using Lennard-Jones potential to model the interaction between a single cluster and the graphite surface, evidence is found for the curvature effect on the binding of silver nanoparticles to folding graphitic surfaces. The theoretical results are compared to scanning electron microscopy and atomic force microscopy images of samples obtained from preformed silver cluster deposition on carboneous substrates exhibiting anisotropic pleat structures.

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Effect of Channel Confinement on the Coarsening Kinetics of Nanoparticles Deposited on Semicrystalline Polymer Templates

Pavan

Shenhar

2013

ChemPlusChem

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Dodecanethiol‐capped gold nanoparticles (NPs) deposited onto a poly(ethylene glycol) substrate quickly coarsen over a timescale of days when stored under ambient conditions. The NP coarsening was studied at different surface coverages and temperatures. The coarsening of NPs depended on their location on the film; NPs located inside the channels coarsened in a different fashion than NPs deposited on the plateaus. Size distributions studied by image analysis and comparison to theoretical distribution functions shed light on the coarsening mechanism in each case, revealing the role of dimensionality.

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Bent graphite surfaces as guides for cluster diffusion and anisotropic growth

Cited by 16 publications

References 22 publications

Fragmentation pathways of nanofractal structures on surfaces

Fragmentation pathways of nanofractal structures on surfaces

Curvature effect on the interaction between folded graphitic surface and silver clusters

Effect of Channel Confinement on the Coarsening Kinetics of Nanoparticles Deposited on Semicrystalline Polymer Templates

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