Synthesis of aligned nanoparticles on laser-generated templates
Synthesis of aligned nanoparticles on laser-generated templates
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在激光生成模板上合成排列纳米粒子
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
A. J. Pedraza
中科院分区：
文献类型：
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作者：
Y. Guan;A. J. Pedraza
介绍了一种快速、简单的在硅衬底上制备大面积自对准金纳米粒子的方法。该技术包括三个连续的步骤：首先，对衬底进行激光照射以产生周期性的纳米褶皱结构;第二，使用离子束溅射沉积生长金薄膜;第三，进行热处理以产生纳米颗粒的形成和自对准。纳米颗粒形成沿着条平行于纳米线。条带间距等于纳米波纹间距，并且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。发现以非常浅的掠射角（0°）沉积膜在800 °C下在空气中热退火时诱导形成沿沿着涟漪脊排列的单个纳米颗粒行。为了获得单粒子线，束准直器，旨在减少入射离子束的角展度，在沉积过程中采用。该技术具有通用性，可用于大量基板/薄膜组合。对其他衬底的研究将提供获得类似结果的最佳条件，因为激光诱导的周期性结构是相当普遍的现象。
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 (0°) induces, upon thermal annealing in air at 800 °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.