We investigated the oxidation and the reduction of iron thin films deposited on Pt(111) surfaces by using X-ray photoelectron spectroscopy (XPS). Upon an oxygen exposure of 300 Langmuir at a film temperature of 873 K, the Fe layers were mostly oxidized as Fe3O4. When the Fe films were exposed to the same amount of oxygen at room temperature, partial oxidation as Fe3O4 was observed for a 3-ML Fe film while there was no oxidation for a 2-ML Fe film. On heating the films oxidized at 873 K, Fe 3O4 was reduced to FeO, and even decomposition was observed. The underlying reasons for these chemical changes in iron and iron-oxide films are discussed.
|Number of pages||5|
|Journal||Journal of the Korean Physical Society|
|State||Published - 2006 Sep 1|
- Iron films
- X-ray photoelectron spectroscopy