| AVS 57th International Symposium & Exhibition | |
| Surface Science | Friday Sessions |
| Session SS-FrM |
| Session: | Reactivity of Oxides, Mainly TiO2 |
| Presenter: | F.N. Womack, Louisiana State University |
| Authors: | F.N. Womack, Louisiana State University R. Singh, Louisiana State University Y. Losovyi, Louisiana State University O. Kizilkaya, Louisiana State University R.L. Kurtz, Louisiana State University P.T. Sprunger, Louisiana State University |
| Correspondent: | Click to Email |
Iron oxides are used as catalysts in a number of processes crucial to our standard of living, most notably the water-gas shift reaction and the Haber process for producing ammonia. Recent work[1-3] on ultra-thin iron oxide films suggests that their catalytic efficiency can be improved by the addition of metal nanoparticles. We have performed ARPES and LEED experiments on ultra-thin film FeOx grown on Cu(100). In agreement with our STM results, FeO structure (electronic) is observed at monolayer coverage, but Fe3O4 is observed above 2.5 ML. Moreover, Ag growth, at submonolayer coverages on both oxide phases , there is an increase in binding energy of the Ag 4d band indicating charge transfer form the iron oxide. This partial reduction of Ag may provide sites on the film surface for both oxidation and reduction of adsorbed species. In addition to electronic structure, STM atomic/morphological structure will be presented, as well as induced chemisorption changes , probed by both HREELS and TPD .
[1] L. Giordano et al., Physical Review Letters 101, 1 (2008).
[2] C. Lemire et al., Surface Science 552, 27 (2004).
[3] Y. N. Sun et al., Surface Science 603, 3099 (2009).