School of Physics and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland.
Nanotechnology. 2017 May 19;28(20):205602. doi: 10.1088/1361-6528/aa6b50. Epub 2017 Apr 4.
The growth of Fe nanostructures on the stoichiometric MoO/Mo(110) and oxygen-rich MoO /Mo(110) surfaces has been studied using low-temperature scanning tunnelling microscopy (STM) and density functional theory calculations. STM results indicate that at low coverage Fe nucleates on the MoO/Mo(110) surface, forming small, well-ordered nanoclusters of uniform size, each consisting of five Fe atoms. These five-atom clusters can agglomerate into larger nanostructures reflecting the substrate geometry, but they retain their individual character within the structure. Linear Fe nanocluster arrays are formed on the MoO/Mo(110) surface at room temperature when the surface coverage is greater than 0.6 monolayers. These nanocluster arrays follow the direction of the oxide rows of the strained MoO/Mo(110) surface. Slightly altering the preparation procedure of MoO/Mo(110) leads to the presence of oxygen adatoms on this surface. Fe deposition onto the oxygen-rich MoO /Mo(110) surface results in elongated nanostructures that reach up to 24 nm in length. These nanolines have a zigzag shape and are likely composed of partially oxidised Fe formed upon reaction with the oxygen-rich surface.
使用低温扫描隧道显微镜 (STM) 和密度泛函理论计算研究了化学计量 MoO/Mo(110) 和富氧 MoO/Mo(110) 表面上 Fe 纳米结构的生长。STM 结果表明，在低覆盖度下，Fe 在 MoO/Mo(110) 表面成核，形成尺寸均匀的、排列有序的小五聚体纳米簇，每个纳米簇由五个 Fe 原子组成。这些五原子簇可以聚集成反映衬底几何形状的较大纳米结构，但在结构内保持其个体特征。当表面覆盖率大于 0.6 单层时，在室温下，Fe 纳米团簇阵列在 MoO/Mo(110) 表面上形成。这些纳米团簇阵列沿着应变 MoO/Mo(110) 表面的氧化物行方向排列。略微改变 MoO/Mo(110) 的制备程序会导致表面存在氧原子。将 Fe 沉积到富氧 MoO/Mo(110) 表面上会导致形成长达 24nm 的伸长纳米结构。这些纳米线具有锯齿形形状，可能由与富氧表面反应形成的部分氧化 Fe 组成。
