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

机译：快速重离子辐照引起的Pt纳米颗粒的形变

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摘要

Pt nanoparticles (NPs) formed by ion-beam synthesis in amorphous SiO_2 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 keVm~3.
机译：通过在27-185 MeV能量范围内的Au离子辐照在非晶SiO_2中通过离子束合成形成的Pt纳米颗粒（NPs）。小角X射线散射（SAXS）和透射电子显微镜用于表征NPs中辐射诱导的形状转变。提出了一种简单而有效的分析SAXS数据以确定两个NP维数的方法。对于大于能量依赖性阈值直径的NP，在27-185 MeV范围内从4.0到6.5 nm变化，观察到辐照通量从球形到棒状的转变。小于此阈值直径的NP在辐照后仍保持球形，但由于溶解而尺寸减小。对于最小的颗粒，后者更为明显。转换后的NP的次要尺寸以能量相关的值饱和，该值与伸长的阈值直径相当。饱和的次要尺寸小于基体内辐照引起的熔融痕迹的直径。我们证明了直径为13 nm的Pt NPs达到了小尺寸的饱和状态，超过了将总能量沉积到20 keV / nm〜3的矩阵中。

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