| AVS 54th International Symposium | |
| Surface Science | Wednesday Sessions |
| Session SS1-WeM |
| Session: | Oxide Surface Reactivity |
| Presenter: | J.H. Baricuatro, University of Washington |
| Authors: | J.H. Baricuatro, University of Washington J. Farmer, University of Washington C.T. Campbell, University of Washington |
| Correspondent: | Click to Email |
The energetics of Ag deposition on well-defined films of CeO2(111) were investigated using adsorption microcalorimetry. Thin films of CeO2(111) were grown on Pt(111) at 700 °C by thermal evaporation of Ce under a reactive atmosphere of O2. Ag was evaporated from an effusive vapor source and the resultant surface structures were probed using a combination of low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and low-energy He+ ion scattering spectroscopy (LEIS). The adsorption of Ag exhibited a sticking coefficient that is close to unity (0.98), independent of coverage. The enthalpy of adsorption of Ag was initially low (ca. 200 kJ/mol) but increased with Ag coverage up to the sublimation enthalpy of bulk Ag. The effect of surface oxygen vacancies on the adsorption energy of Ag was also investigated.