Cluster Processes in Gases and Plasmas

Smirnov, Boris M.

doi:10.1002/9783527628650

Cited by 64 publications

(56 citation statements)

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“…Cluster-cluster collisions may lead to growth via aggregation or coalescence. 18 Aggregation does not change the shapes of the colliding clusters, whereas coalescing clusters merge into a particle whose shape is different from the cluster shapes prior to the collision. 18 In the course of further growth, the particle shape may change due to single atom migration.…”

Section: Cluster Growth Mechanismmentioning

confidence: 98%

“…18 Aggregation does not change the shapes of the colliding clusters, whereas coalescing clusters merge into a particle whose shape is different from the cluster shapes prior to the collision. 18 In the course of further growth, the particle shape may change due to single atom migration. With increasing density of the metal vapour, the energy barrier for aggregation of atoms decreases and spontaneous growth of nanoparticles by passing nucleation becomes possible.…”

Section: Cluster Growth Mechanismmentioning

confidence: 98%

“…When the supersaturation is low, clusters are created via homogeneous nucleation (random formation of nuclei). 18 Since the spectrum of density fluctuations in the supersaturated region is wide, a nucleus either grows into a stable liquid particle (if it is larger than a critical size) or vapourizes. After the nucleation stage, clusters can grow by several mechanisms.…”

Section: Cluster Growth Mechanismmentioning

confidence: 99%

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The general mechanisms of Cu cluster formation in the processes of condensation from the gas phase

et al. 2015

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Technological applications of metallic clusters impose very strict requirements for particle size, shape, structure and defect density. Such geometrical characteristics of nanoparticles are mainly determined by the process of their growth. This work represents the basic mechanisms of cluster formation from the gas phase that has been studied on the example of copper. The process of Cu nanoclusters synthesis has been studied by the moleculardynamics method based on tight-binding potentials. It has been shown that depending on the size and temperature of the initial nanoclusters the process of nanoparticle formation can pass through different basic scenarios. The general conditions of different types of particles formation have been defined and clear dependence of the cluster shape from collision temperature of initial conglomerates has been shown. The simulation results demonstrate a very good agreement with the available experimental data. Thus, it has been shown that depending on the specific application of the synthesized particles or in electronics, where particles of a small size with a spherical shape are required, or in catalytic reactions, where the main factor of effectiveness is the maximum surface area with the help of temperature of the system it is possible to get the realization of a certain frequency of this or that scenario of the shape formation of nanocrystalline particles.

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Section: Cluster Growth Mechanismmentioning

confidence: 98%

Section: Cluster Growth Mechanismmentioning

confidence: 98%

Section: Cluster Growth Mechanismmentioning

confidence: 99%

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The general mechanisms of Cu cluster formation in the processes of condensation from the gas phase

et al. 2015

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“…Furthermore, the plasma which is applied to sputter atoms from the metallic target also influences the cluster growth. Not only does it transfer charges to the nanoparticles, by ejecting highly energetic ions in the direction of the substrate it also causes defects at the surface, where the trapping probability of metal atoms is strongly increased [26,27].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of gold cluster growth during sputter deposition

Abraham

Strunskus

Faupel

et al. 2016

Journal of Applied Physics

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We present a molecular dynamics simulation scheme that we apply to study the time evolution of the self-organized growth process of metal cluster assemblies formed by sputter-deposited gold atoms on a planar surface. The simulation model incorporates the characteristics of the plasma-assisted deposition process and allows for an investigation over a wide range of deposition parameters. It is used to obtain data for the cluster properties which can directly be compared to recently published experimental data for gold on polystyrene (M. Schwartzkopf et al., ACS Appl. Mater. Interfaces 7, 13547 (2015)). While good agreement is found between the two, the simulations additionally provide valuable time-dependent real-space data of the surface morphology some of whose details are hidden in the reciprocal-space scattering images that were used for the experimental analysis.

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“…[1,2]. As a result, the metastable phases can be obtained because of the high cooling rate, high degrees of deformation or both [3,4].…”

Section: Introductionmentioning

confidence: 96%

On the Possibility to Control an Atom Motion in a FCC Iron Nanocluster

Bondarenko

Nedolya

2018

Acta Phys. Pol. A

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The energy of the isolated iron nanocluster was calculated by molecular mechanics method using the LennardJones potential depending on the position of impurity carbon atom and substitutional atoms of nickel. The cluster included a carbon atom, that drifted from an inside octahedral interstice to a direction x022y to the surface directly or to a tetrahedral interstice in x111y direction and after that in x222y direction to the surface. In addition one of 14 iron atoms was replaced by a nickel atom (or pair atoms), the position of which was changing during simulation. It is shown that there were positions of a nickel atom that significantly affected nanoclusters energy. The calculation results indicated that position of a carbon atom in the octahedral interstice was more energetically favorable than tetrahedral interstice in the case of fcc nanocluster. On the other side, the potential barrier was smaller in the direction x111y than in the direction x022y. This indicates that there are two ways for carbon atom to drift to the surface of the nanocluster. The positions of nickel atoms were identified, which significantly affected the height of potential barriers of a tetrahedral and an octahedral interstice and determined the possible direction of carbon atoms drift. This allows manipulating atoms at the surface of nanocluster.

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Cluster Processes in Gases and Plasmas

Cited by 64 publications

References 0 publications

The general mechanisms of Cu cluster formation in the processes of condensation from the gas phase

The general mechanisms of Cu cluster formation in the processes of condensation from the gas phase

Molecular dynamics simulation of gold cluster growth during sputter deposition

On the Possibility to Control an Atom Motion in a FCC Iron Nanocluster

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