Nanoclusters and nanolines: the effect of molybdenum oxide substrate stoichiometry on iron self-assembly

被引：1

作者：

Lubben, O. ^{[1
,2
]}

Krasnikov, S. A. ^{[1
,2
]}

Walls, B. ^{[1
,2
]}

Sergeeva, N. N. ^{[3
]}

Murphy, B. E. ^{[1
,2
]}

Chaika, A. N. ^{[1
,2
,4
]}

Bozhko, S. I. ^{[1
,2
,4
]}

Shvets, I. V. ^{[1
,2
]}

机构：

[1] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland

[2] Trinity Coll Dublin, CRANN, Dublin 2, Ireland

[3] Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England

[4] Russian Acad Sci, Inst Solid State Phys, Chernogolovka, Russia

来源：

NANOTECHNOLOGY | 2017年 / 28卷 / 20期

基金：

爱尔兰科学基金会;

关键词：

iron nanoclusters; self-assembly; scanning tunnelling microscopy; density functional theory; molybdenum oxide; GOLD CLUSTERS; NANOSTRUCTURES; MICROSCOPY; STM;

D O I：

10.1088/1361-6528/aa6b50

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The growth of Fe nanostructures on the stoichiometric MoO2/Mo(110) and oxygen-rich MoO2+x/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 MoO2/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 MoO2/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 MoO2/Mo(110) surface. Slightly altering the preparation procedure of MoO2/Mo(110) leads to the presence of oxygen adatoms on this surface. Fe deposition onto the oxygen-rich MoO2+x/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.

引用

页数：6

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