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|Title: ||Shape transformation of Pt nanoparticles induced by swift heavy-ion irradiation.|
|Authors: ||Giulian, R|
Small Angle Scattering
Transmission Electron Microscopy
|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|
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