Shape transformation of Pt nanoparticles induced by swift heavy-ion irradiation

被引：75
|
作者：
Giulian, R. [1 ]
Kluth, P. [1 ]
Araujo, L. L. [1 ]
Sprouster, D. J. [1 ]
Byrne, A. P. [2 ]
Cookson, D. J. [3 ]
Ridgway, M. C. [1 ]
机构：
[1] Australian Natl Univ, Res Sch Phys Sci & Engn, Dept Elect Mat Engn, Canberra, ACT 0200, Australia
[2] Australian Natl Univ, Res Sch Phys Sci & Engn, Dept Nucl Phys, Canberra, ACT 0200, Australia
[3] Australian Synchrotron Res Program, Argonne, IL 60439 USA
来源：
PHYSICAL REVIEW B | 2008年 / 78卷 / 12期
基金：
美国国家科学基金会; 澳大利亚研究理事会;
关键词：
D O I：
10.1103/PhysRevB.78.125413
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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).
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页数：8
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