Shape transformation of Pt nanoparticles induced by swift heavy-ion irradiation
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Date
2008-09
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
Pt nanoparticles (NPs) formed by ion-beam synthesis in amorphous SiO2 were irradiated with Au ions in the energy range of 27-185 MeV. Small-angle x-ray scattering (SAXS) and transmission electron microscopy were used to characterize an irradiation-induced shape transformation within the NPs. A simple yet effective way of analyzing the SAXS data to determine both NP dimensions is presented. A transformation from spherical to rodlike shape with increasing irradiation fluence was observed for NPs larger than an energy-dependent threshold diameter, which varied from 4.0 to 6.5 nm over 27-185 MeV. NPs smaller than this threshold diameter remained spherical upon irradiation but decreased in size as a result of dissolution. The latter was more pronounced for the smallest particles. The minor dimension of the transformed NPs saturated at an energy-dependent value comparable to the threshold diameter for elongation. The saturated minor dimension was less than the diameter of the irradiation-induced molten track within the matrix. We demonstrate that Pt NPs of diameter 13 nm reach saturation of the minor dimension beyond a total-energy deposition into the matrix of 20 keV/nm(3). © 2008, American Physical Society
Description
Keywords
Irradiation, Platinum, Ion beams, Small angle scattering, Transmission electron microscopy, Nanostructures
Citation
Giulian, R., Kluth, P., Araujo, L. L., Sprouster, D. J., Byrne, A. P., Cookson, D. J., & Ridgway, M. C., (2008). Shape transformation of Pt nanoparticles induced by swift heavy-ion irradiation. Physical Review B, 78(12), 125413. doi:10.1103/PhysRevB.78.125413