| AVS 55th International Symposium & Exhibition | |
| Surface Science | Monday Sessions |
| Session SS+NC-MoM |
| Session: | Catalysis and Alloy Formation |
| Presenter: | P.A.P. Nascente, Federal University of Sao Carlos, Brazil |
| Authors: | P.A.P. Nascente, Federal University of Sao Carlos, Brazil A. Pancotti, State University of Campinas, Brazil M.F. Carazzolle, State University of Campinas, Brazil A. de Siervo, State University of Campinas, Brazil D.A. Tallarico, Federal University of Sao Carlos, Brazil R. Landers, State University of Campinas, Brazil G.G. Kleiman, State University of Campinas, Brazil |
| Correspondent: | Click to Email |
Bimetallic surfaces have attracted considerable interest due to their catalytic, electronic, electrochemical, and magnetic properties. The deposition of an ultra-thin metal film on a single crystal metal substrate can produce a bimetallic surface. The interfacial interactions between the two metals can lead to preferential surface orientation, surface relaxation, surface reconstruction, order/disordered effects, and surface alloying. In this work, ultra-thin films (1 and 3 monolayers) of Pd were deposited on the Au(111) surface and then characterized by X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), and X-ray photoelectron diffraction (XPD). We have considered three models: Pd overlayers on the Au(111) substrate, Pd islands covering the Au(111) surface, and a random AuxPd1-x alloy. The reliability of the theoretical simulations as compared to the experimental XPD data was measured through the R-factor analysis. The comparison between experimental and theoretical XPD results indicated that, for the 1 ML film annealed at 450 C, Pd diffused into the Au bulk, causing alloy formation, and for the thicker film, the Pd islands were, at most, 3 ML thick.