Generation of nanopore structures in yttria-stabilized zirconia by femtosecond pulsed laser irradiation
Generation of nanopore structures in yttria-stabilized zirconia by femtosecond pulsed laser irradiation
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DOI：
10.1016/j.jmrt.2023.01.079
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Yuka Yamamuro;T. Shimoyama;Jiwang Yan
中科院分区：
文献类型：
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作者：
Yuka Yamamuro;T. Shimoyama;Jiwang Yan
利用飞秒脉冲激光辐照氧化钇稳定的氧化锆（YSZ），研究了制备纳米孔结构的可行性和基本特性。通过将激光功率控制在烧蚀阈值附近，仅用一个激光脉冲就成功地在YSZ表面产生了大量的纳米孔。纳米孔产生机制涉及通过晶粒的凸起形状的光聚焦和晶粒内部的烧蚀。随着激光功率的增加，纳米孔的数量增加。横截面观察显示纳米孔的深度约为500 nm，并且在保持颗粒形状不变的情况下，在顶层的YSZ颗粒内部产生纳米孔。结果发现，较高的扫描速度和少量的扫描使得能够在不改变原始表面形状的情况下制造纳米孔，从而避免去除表面层。通过拉曼光谱对YSZ的激光辐照表面进行了表征，发现与原始YSZ表面相比，纳米孔生成后的样品中没有明显的相变，证实了对本体材料没有热损伤。具有纳米孔的表面表现出表面亲水性的增强。这些发现证明了在YSZ的顶表面中选择性地产生纳米孔以用于功能表面而不对工件造成严重热损伤的可能性。预计纳米孔的产生将导致YSZ的新应用。
Femtosecond pulsed laser irradiation of yttria-stabilized zirconia (YSZ) was performed to investigate the feasibility and fundamental characteristics of nanopore structure fabrication. Numerous nanopores were successfully generated on the YSZ surface with only a single laser pulse shot by controlling laser power near the ablation threshold. The nanopore generation mechanism involves light focusing by the convex shape of a crystal grain and ablation inside the grain. By increasing laser power, the number of nanopores increased. Cross-sectional observation revealed that the depth of nanopores was about 500 nm, and nanopores were generated inside the YSZ grains of the top layer while keeping the grains' shapes unchanged. It was found that higher scanning speed and a small number of scans enabled nanopores fabrication without changing the original surface shape, avoiding the removal of the surface layer. Laser-irradiated surfaces of YSZ were characterized by Raman spectroscopy, and it was found that there was no significant phase change in the specimen after nanopore generation compared with the original YSZ surface, confirming that there was no thermal damage to the bulk material. The surface with nanopores showed an enhancement in surface hydrophilicity. These findings demonstrated the possibility of selectively generating nanopores in the top surface of YSZ for use in functional surfaces without serious thermal damage to the workpiece. It is expected that the nanopore generation will lead to new applications of YSZ.