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ANSTO Publications Online >
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Journal Articles >
Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/1910
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| Title: | Shape transformation of Pt nanoparticles induced by swift heavy-ion irradiation. |
| Authors: | Giulian, R Kluth, P Araujo, LL Sprouster, DJ Byrne, AP Cookson, DJ Ridgway, MC |
| Keywords: | Irradiation Platinum Ion Beams Small Angle Scattering Transmission Electron Microscopy Nanostructures |
| Issue Date: | Sep-2008 |
| Publisher: | American Physical Society |
| Citation: | Giulian, R., Kluth, P., Araujo, L. L., Sprouster, D. J., Byrne, A. P., Cookson, D. J., et al. (2008). Shape transformation of Pt nanoparticles induced by swift heavy-ion irradiation. Physical Review B, 78(12), 125413. |
| 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 |
| URI: | http://dx.doi.org/10.1103/PhysRevB.78.125413 http://apo.ansto.gov.au/dspace/handle/10238/1910 |
| ISSN: | 1098-0121 |
| Appears in Collections: | Journal Articles |
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