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Abstract
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| The shape deformation (elongation) of metallic nanoparticles (NPs) embedded in a dielectric matrix produced by irradiation with swift heavy ions is a phenomenon that has been known for many years. The rods obtained in this way have their long axis aligned with the incident ion beam direction, which can be advantageous for many applications. The physics involved in the sphere-to-rod transformation has been extensively studied and some phenomenological models exist, but it is not yet fully understood. One of the reasons that complicate this task is the lack of information concerning the intermediate stages of the deformation mechanism. In this work we have studied the elongation of silver nanoparticles irradiated with 40 MeV Bromine ions by means of in situ optical measurements, transmission electron microscopy and molecular dynamics simulations. The localized surface plasmon resonance of silver nanoparticles has a strong dependence on the particle shape and size, which allowed us to obtain the geometrical parameters with remarkable accuracy by means of a fit of the optical spectra. Optical results have been compared with transmission electron microscopy images and molecular dynamics simulations and the agreement is excellent in both cases. An important advantage of in situ measurements is that they yield an extremely detailed information of the full elongation kinetics. Final NP elongation depends on a complex competition between single-ion deformation, Ostwald ripening and dissolution. Building and validating theoretical models with the data reported in this work should be easier than with the information previously available, due to the unprecedented level of kinetic details obtained from the in situ measurements. | |
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International
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Si |
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Congress
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19th International Conference on Radiation Effects in Insulators (REI 19) |
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960 |
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Place
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Versalles (Francia) |
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Reviewers
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Si |
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ISBN/ISSN
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0000-0000 |
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Start Date
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02/07/2017 |
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End Date
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07/07/2017 |
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From page
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0 |
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To page
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0 |
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Proceedings |