脉冲laser沉积法在Ag（001）表面生长氧化镍的初始阶段
Initial stages of nickel oxide growth on Ag(001) by pulsed laser deposition
摘要：
采用脉冲激光沉积法在Ag（001）衬底上制备了亚单层的氧化镍薄膜，并用扫描隧道显微镜和X射线光电子能谱学对薄膜进行了原位表征。我们观察到的薄膜的准二维生长，并清楚地确定了几种缺陷，如嵌入式金属镍簇，特别是氧原子，即使在深入到基板。这些起源于Ni和O超热射弹，以及从NiO的目标激光烧蚀过程中形成的NiO集群。这些缺陷在延长薄膜生长的成核阶段中起着成核点的作用。
英文摘要：
Submonolayers of nickel oxide films were grown on an Ag(001) by pulsed laser deposition, and characterized in-situ by both scanning tunneling microscopy and X-ray photoelectron spectroscopy. We observed quasi-two-dimensional growth of the film, and clearly identified several kinds of defects, such as embedded metallic Ni clusters and, notably, oxygen atoms, even while looking deeply into the substrate. These originated from Ni and O hyperthermal projectiles as well as from NiO clusters that were formed during laser ablation of a NiO target. Those defects played a role of nucleation sites in extending the nucleation stage of thin film growth.
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