Formation and emission mechanisms of Ag nanoclusters in the Ar matrix assembly cluster source

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Zhao , J , Cao , L , Palmer , R E , Nordlund , K & Djurabekova , F 2017 , ' Formation and emission mechanisms of Ag nanoclusters in the Ar matrix assembly cluster source ' , Physical Review Materials , vol. 1 , no. 6 , 066002 . https://doi.org/10.1103/PhysRevMaterials.1.066002

Title: Formation and emission mechanisms of Ag nanoclusters in the Ar matrix assembly cluster source
Author: Zhao, Junlei; Cao, Lu; Palmer, Richard E.; Nordlund, Kai; Djurabekova, Flyura
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-11-29
Language: eng
Number of pages: 9
Belongs to series: Physical Review Materials
ISSN: 2475-9953
URI: http://hdl.handle.net/10138/233502
Abstract: In this paper, we study the mechanisms of growth of Ag nanoclusters in a solid Ar matrix and the emission of these nanoclusters from the matrix by a combination of experimental and theoretical methods. The molecular dynamics simulations show that the cluster growth mechanism can be described as "thermal spike-enhanced clustering" in multiple sequential ion impact events. We further show that experimentally observed large sputtered metal clusters cannot be formed by direct sputtering of Ag mixed in the Ar. Instead, we describe the mechanism of emission of the metal nanocluster that, at first, is formed in the cryogenic matrix due to multiple ion impacts, and then is emitted as a result of the simultaneous effects of interface boiling and spring force. We also develop an analytical model describing this size-dependent cluster emission. The model bridges the atomistic simulations and experimental time and length scales, and allows increasing the controllability of fast generation of nanoclusters in experiments with a high production rate.
Subject: MOLECULAR-DYNAMICS
METAL NANOPARTICLES
SPUTTERING YIELDS
COLLISION CASCADES
CHEMICAL-SYNTHESIS
SHAPE
IRRADIATION
SIZE
GAS
AU
114 Physical sciences
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