Surface structural evolution in iron oxide thin films.
Surface structural evolution in iron oxide thin films.
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DOI：
10.1021/la103732r
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发表时间：
2011-01
期刊：
影响因子：
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通讯作者：
M. Xue;Shuai Wang;Kehui Wu;Jiandong Guo;Q. Guo
中科院分区：
文献类型：
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作者：
M. Xue;Shuai Wang;Kehui Wu;Jiandong Guo;Q. Guo
在高真空条件下，通过在氧气中沉积Fe或氧化预先制备的Fe（110）薄膜，在单晶Mo（110）衬底上制备了有序的氧化铁薄膜。通过各种表面分析技术研究了铁氧化物薄膜的表面结构和电子结构。结果表明，薄膜的表面结构分别从亚稳态的FeO（111）和O端的Fe（2）O（3）（0001）转变为Fe（3）O（4）（111）。前者强烈地依赖于氧气压力和衬底温度，而后者主要依赖于退火温度。我们的实验观察有助于理解铁氧化物表面结构演化的机制。铁氧化物膜的模型表面，特别是O-封端的表面，可用于进一步研究化学反应（例如，催化）。
Ordered iron oxide ultrathin films were fabricated on a single-crystal Mo(110) substrate under ultrahigh vacuum conditions by either depositing Fe in ambient oxygen or oxidizing preprepared Fe(110) films. The surface structure and electronic structure of the iron oxide films were investigated by various surface analytical techniques. The results indicate surface structural transformations from metastable FeO(111) and O-terminated Fe(2)O(3)(0001) to Fe(3)O(4)(111) films, respectively. The former depends strongly on the oxygen pressure and substrate temperature, and the latter relies mostly upon the annealing temperature. Our experimental observations are helpful in understanding the mechanisms of surface structural evolution in iron oxides. The model surfaces of Fe-oxide films, particularly O-terminated surfaces, can be used for further investigation in chemical reactions (e.g., in catalysis).