电子辐照下金属表面产生的自组织纳米结构

IF 1.3 Q3 INSTRUMENTS & INSTRUMENTATION
K. Niwase
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引用次数: 3

摘要

高能电子的辐照可以通过原子的溅射在薄箔的出射表面产生表面空位。尽管溅射在用直径数百纳米的强电子束照射的区域中随机发生,但在照射下可以出现特征性的地形特征。本文综述了在高剂量360–1250 keV电子辐照的薄金属箔的出射表面上产生的纳米凹槽和纳米孔的自组织的一种新现象。这一现象首次在100K左右的温度下发现,表明金形成了宽度在1至2nm之间的凹槽和空穴。沿着[001]的照射产生沿着[100]和[010]延伸的凹槽,沿着[011]的照射产生沿[100]的凹槽,而对于[111]的照射没有观察到清晰的凹槽。相比之下,可以达到超过20nm深度的纳米孔主要沿着光束方向发展。纳米结构的形成取决于辐照温度,表现出约240K的临界温度的存在,超过该临界温度,宽度显著增加,密度降低。还研究了银、铜、镍和铁形成的纳米结构。从辐照诱导效应的角度讨论了自组织过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Self-Organized Nanostructures Generated on Metal Surfaces under Electron Irradiation
Irradiation of high-energy electrons can produce surface vacancies on the exit surface of thin foils by the sputtering of atoms. Although the sputtering randomly occurs in the area irradiated with an intense electron beam of several hundred nanometers in diameter, characteristic topographic features can appear under irradiation. This paper reviews a novel phenomenon on a self-organization of nanogrooves and nanoholes generated on the exit surface of thin metal foils irradiated with high doses of 360–1250 keV electrons. The phenomenon was discovered firstly for gold irradiated at temperatures about 100 K, which shows the formation of grooves and holes with widths between 1 and 2 nm. Irradiation along [001] produces grooves extending along [100] and [010], irradiation along [011] gives grooves along [100], whereas no clear grooves have been observed for [111] irradiations. By contrast, nanoholes, which may reach depths exceeding 20 nm, develop mainly along the beam direction. The formation of the nanostructures depends on the irradiation temperatures, exhibiting an existence of a critical temperature at about 240 K, above which the width significantly increases, and the density decreases. Nanostructures formed for silver, copper, nickel, and iron were also investigated. The self-organized process was discussed in terms of irradiation-induced effects.
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来源期刊
CiteScore
2.80
自引率
28.60%
发文量
27
审稿时长
11 weeks
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