Abstract The study presents results of nanosecond laser ablation of a Ni target in a liquid as a method of producing contamination-free micro- and nanosized colloidal structures. The ablation was performed in two liquids – double distilled water and ethanol, as their role on the characteristics of the ablated material is clarified. The laser ablation method in liquid was extended by applying an external magnetic field during the ablation process. A separation of micron and submicron particles from the nanoparticles in the colloidal solution is achieved by placing a substrate in the liquid, where the micron size structures are deposited under the action of the external magnetic field. At certain experimental conditions, the deposition of ordered one-dimensional microstructures on the substrate can be realized. The influence of different laser wavelengths on the features of the nanostructures dispersed in the liquid and microstructures deposited on the substrate was also investigated. On the basis of detailed analyses using Optical Microscopy, Scanning Electron Microscopy, Selected area electron diffraction, and Transmission Electron Microscopy the morphology, composition, and size distribution of the fabricated structures were studied. The presented method allows the fabrication of contamination-free micro- and nanostructures with potential applications in biotechnology, catalysis, and magneto-optics devices.

中文翻译：

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在外部磁场存在的情况下激光烧蚀镍：微米尺寸颗粒的选择

摘要 本研究介绍了在液体中对 Ni 靶进行纳秒激光烧蚀的结果，作为一种生产无污染微米和纳米级胶体结构的方法。烧蚀是在两种液体中进行的——双蒸水和乙醇，因为它们对烧蚀材料特性的作用得到了阐明。通过在烧蚀过程中施加外部磁场，扩展了液体中的激光烧蚀方法。微米和亚微米颗粒与胶体溶液中的纳米颗粒的分离是通过将基材置于液体中来实现的，其中微米级结构在外部磁场的作用下沉积。在一定的实验条件下，可以实现有序的一维微结构在基材上的沉积。还研究了不同激光波长对分散在液体中的纳米结构和沉积在基底上的微结构的特征的影响。在使用光学显微镜、扫描电子显微镜、选区电子衍射和透射电子显微镜进行详细分析的基础上，研究了所制造结构的形态、组成和尺寸分布。所提出的方法允许制造无污染的微米和纳米结构，在生物技术、催化和磁光器件中具有潜在的应用。选择区域电子衍射和透射电子显微镜研究了制造结构的形态、组成和尺寸分布。所提出的方法允许制造无污染的微米和纳米结构，在生物技术、催化和磁光器件中具有潜在的应用。选择区域电子衍射和透射电子显微镜研究了制造结构的形态、组成和尺寸分布。所提出的方法允许制造无污染的微米和纳米结构，在生物技术、催化和磁光器件中具有潜在的应用。