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Interaction of simple organic molecules with cerium oxide surfaces
 Ormoš, Martin ; Matvija, Peter (advisor) ; Sobotík, Pavel (referee)
In this work we prepare well defined thin epitaxy layers of cerium oxide (CeO2) and cerium oxide with nanoparticles of platinum (CeO2/Pt) on the Cu(111) substrate. The surface was characterized before exposition by ethanol molecules, after exposition, after annealing at 725 K in UHV and after annealing in O2 atmosphere at pressure p = 5×10−7 mbar at 725 K by LEED (low-electron energy diffraction), XPS (x-ray photoelectron di- ffraction) and STM (scanning tunnelling microscopy). Layer of CeO2/Pt was also exposed to 2 mbar of methane and 2, 5 mbar of methane and oxygen mixture in a ratio 1:1. This layer was observed by NAP-STM in higher pressures. In this work we have discovered that a disordered layer is formed on the CeO2 surface after exposure to the mixture of air and ethanol. Interaction of adsorbed molecules and ceria is increased during annealing in UHV, when carbon desorbs from the surface and cerium is reduced. After annealing in oxygen cerium is reoxidized. However, even after reoxidation, the surface contains a large number of defects of various types. Significant increase in brightness was observed in the proximity of domain interfaces of cerium oxide layers during scanning at higher pressures of oxygen. This effect will be studied more closely in our future experiments. 1
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4 Ormoš, Michal
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