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Damage production in nanoparticles under light ion irradiation

Jarvi, T. T. and Kuronen, A. and Nordlund, K. and Albe, K. (2009):
Damage production in nanoparticles under light ion irradiation.
In: Phys. Rev. B, American Physical Society, pp. 132101-1, 80, (13), [Online-Edition: http://prb.aps.org/abstract/PRB/v80/i13/e132101],
[Article]

Abstract

Modifying the properties of nanoparticles by ion irradiation leads to sputtering and defect production, possibly enhanced by the high surface-to-volume ratio of the irradiated objects. By molecular-dynamics simulations, we address the size dependence of platinum nanoparticles' response to light ion irradiation and show that in contrast to irradiation by heavier ions the sputtering yield does not depend on the particle size. In contrast, very high vacancy concentrations can be obtained in nanoparticles, the maximal concentration depending on the particle size. The evolution of vacancy concentration and sputtering upon irradiation are rationalized in terms of a kinetic model based on single knock-on events.

Item Type: Article
Erschienen: 2009
Creators: Jarvi, T. T. and Kuronen, A. and Nordlund, K. and Albe, K.
Title: Damage production in nanoparticles under light ion irradiation
Language: English
Abstract:

Modifying the properties of nanoparticles by ion irradiation leads to sputtering and defect production, possibly enhanced by the high surface-to-volume ratio of the irradiated objects. By molecular-dynamics simulations, we address the size dependence of platinum nanoparticles' response to light ion irradiation and show that in contrast to irradiation by heavier ions the sputtering yield does not depend on the particle size. In contrast, very high vacancy concentrations can be obtained in nanoparticles, the maximal concentration depending on the particle size. The evolution of vacancy concentration and sputtering upon irradiation are rationalized in terms of a kinetic model based on single knock-on events.

Journal or Publication Title: Phys. Rev. B
Volume: 80
Number: 13
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 28 Feb 2012 14:58
Official URL: http://prb.aps.org/abstract/PRB/v80/i13/e132101
Identification Number: doi:10.1103/PhysRevB.80.132101
Related URLs:
Funders: This work was done within the Finnish Centre of Excellence in Computational Molecular Science �CMS�, financed by the Academy of Finland and the University of Helsinki., We also gratefully acknowledge support within an exchange program from the Academy of Finland and the German Foreign Exchange Service �DAAD�, as well as the grants of computer time from CSC, the Finnish IT Center for Science.
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