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Ion beam shaping of Au nanoparticles prepared by micellar technique

机译：胶束技术制备的金纳米粒子的离子束成形

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摘要

Irradiation-induced burrowing and ion-induced shaping effects of Au nanoparticles are investigated. Hexagonally arranged Au nanoparticles prepared by micellar technique with diameter ～10nm and inter-particle distance of about 80 nm were sequentially irradiated with 200 keV Ar~+ ions to fluences of 5 × 10~(15) ions/cm~2. Irradiation with Argon ions causes sinking of the Au nanoparticles into the subjacent SiO_2 layer due to capillary driving forces related to specific wetting conditions while the spherical shape is conserved. Subsequent irradiation with 54 MeV Ag~(8+) swift heavy ions of these spherical Au nanoparticles confined within a silica matrix shapes them into prolate nanorods and nanowires whose principal axes are aligned along the beam direction. Above a threshold fluence two deformation regimes have been observed. For relatively low fluences Au nanoparticles elongate into nanorods depending on their volume. For high fluences, the formation of nanowires is observed provided that the inter-particle distance is short enough to allow for an efficient mass transport through the silica matrix.
机译：研究了金纳米粒子的辐照诱导穴位和离子诱导成型效应。依次用200 keV Ar〜+离子辐照通过胶束技术制备的直径约10nm，粒子间距离约为80nm的六边形Au纳米粒子，注量为5×10〜（15）离子/ cm〜2。氩离子的照射由于与特定润湿条件有关的毛细驱动力而使Au纳米颗粒沉入到下面的SiO_2层中，同时保持了球形。随后用54 MeV Ag〜（8+）包围在二氧化硅基质中的球形Au纳米粒子的快速重离子进行辐照，将它们整形为长条状的纳米棒和纳米线，其主轴线沿光束方向排列。在阈值通量之上，已经观察到两个变形状态。对于相对较低的注量，Au纳米颗粒根据其体积伸长为纳米棒。对于高通量，观察到纳米线的形成，条件是粒子间距离足够短，以允许有效质量传输通过二氧化硅基质。

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