Kinetic mechanisms of the in situ electron beam-induced self-organization of gold nanoclusters in SiO2

Ruffino F; Grimaldi MG; Giannazzo F; Roccaforte F; Raineri V; Bongiorno C; Spinella C

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Kinetic mechanisms of the in situ electron beam-induced self-organization of gold nanoclusters in SiO2

机译：SiO2中原位电子束诱导金纳米团簇自组织的动力学机理

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Gold nanoclusters (NCs) were produced in thin SiO2 film by a sequential sputtering deposition procedure. In situ time-lapse studies of the NCs size distribution and morphology under 200 keV electron-beam irradiation have been performed using a transmission electron microscopy. Such a study has revealed the microscopic kinetic mechanisms of the NCs growth. In the 0-1620 s irradiation time range, the NCs growth process was found to be formed by two stages: in the 0-720 s time range, the main growth mechanism is demonstrated to be an electron beam-induced ripening of three-dimensional particles controlled by the Au diffusion in the SiO2 matrix. The application of the classical ripening theoretical model allowed us to derive the room-temperature Au diffusion coefficient in SiO2 under the electron-beam irradiation. In the 900-1620 s time range, the main growth mechanism is found to be a particle sintering in which neighbouring NCs form necks, by a partial deformation of their surfaces, through which the Au atomic diffusion occurs from the smaller NCs to the larger one. About the NCs morphology, three main classes of NCs were identified on the basis of their internal atomic structure, as a function of the irradiation time: FCC crystal structure, icosahedral-defect free structure and decahedral multi-twinned structure.

机译：通过连续溅射沉积程序在SiO2薄膜中生产了金纳米簇（NC）。使用透射电子显微镜对200 keV电子束辐照下的NCs尺寸分布和形态进行了原位延时研究。这项研究揭示了NCs生长的微观动力学机制。在0-1620 s的照射时间范围内，发现NCs的生长过程分为两个阶段：在0-720 s的时间范围内，主要的生长机理被证明是电子束诱导的三维成熟SiO 2基体中由Au扩散控制的颗粒。经典成熟理论模型的应用使我们能够得出在电子束辐照下，SiO2中的室温Au扩散系数。在900-1620 s的时间范围内，发现主要的生长机理是粒子烧结，其中相邻的NC通过其表面的局部变形形成颈，通过Au原子扩散从较小的NC扩散到较大的NC。。关于NC的形态，根据其内部原子结构，根据辐照时间确定了三类主要的NC：FCC晶体结构，二十面体无缺陷结构和十面体多孪晶结构。

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《Journal of Physics, D. Applied Physics: A Europhysics Journal》 |2009年第7期|共7页
作者
Ruffino F; Grimaldi MG; Giannazzo F; Roccaforte F; Raineri V; Bongiorno C; Spinella C;
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正文语种 eng
中图分类应用物理学;
关键词
GRAIN-GROWTH; PLATINUM; SURFACES; IRIDIUM; FILMS;

机译：晶粒生长;铂;表面;铱;薄膜;

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1. Kinetic mechanisms of the in situ electron beam-induced self-organization of gold nanoclusters in SiO2 [J] . Ruffino F, Grimaldi MG, Giannazzo F, Journal of Physics, D. Applied Physics: A Europhysics Journal . 2009,第7期

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Kinetic mechanisms of the in situ electron beam-induced self-organization of gold nanoclusters in SiO2

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