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Synthesis of aligned nanoparticies on laser-generated templates

机译：在激光产生的模板上合成对齐的纳米粒子

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摘要

A fast and simple technique that produces self-aligned gold nanoparticles on a silicon substrate, covering a large area, is described. This technique involves three consecutive steps: first, the substrate is laser-irradiated to produce a periodic nanorippled structure; second, a thin film of gold is grown using ion-beam sputter deposition; and third, a thermal treatment is conducted to produce the formation and self-alignment of nanoparticles. The nanoparticles form along strips parallel to the nanoripple lines. The strip spacing equals the nanoripple spacing and the strip width depends on the angle of deposition and the divergence of the ion beam. The nanoparticle diameter is a function of the annealing temperature and time. It was found that deposition of the film at a very shallow grazing angle (0deg ) induces, upon thermal annealing in air at 800 deg C, the formation of single nanoparticle rows aligned along the ripple ridges. In order to obtain the single-particle lines, a beam collimator, aimed at reducing the angular spread of the incident ion beam, was employed during deposition. This technique is general and could be used in a large number of substrate/film combinations. Studies of other substrates would provide optimum conditions to obtain similar results, as laser-induced periodic structures are a fairly universal phenomenon.
机译：描述了一种快速简单的技术，该技术在覆盖大面积的硅基板上产生自对准的金纳米粒子。该技术涉及三个连续步骤：首先，对衬底进行激光辐照，以产生周期性的纳米波纹结构;其次，使用离子束溅射沉积法生长金薄膜。第三，进行热处理以产生纳米颗粒的形成和自对准。纳米颗粒沿着平行于纳米波纹线的条形成。条带间距等于纳米波纹间距，条带宽度取决于沉积角度和离子束的发散度。纳米颗粒直径是退火温度和时间的函数。发现在非常浅的掠射角（0°）下沉积膜时，在空气中在800°C下进行热退火后，会形成沿波纹脊排列的单个纳米粒子行。为了获得单粒子线，在沉积期间采用了旨在减小入射离子束的角展度的束准直仪。该技术是通用的，可以用于大量的基材/薄膜组合中。对其他基板的研究将提供最佳条件以获得相似的结果，因为激光诱导的周期性结构是相当普遍的现象。

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