Abstract
Palladium (Pd) crystal islands, with 100–200 nm wide (111) top facets, were grown in ultrahigh vacuum (UHV) on an anatase (001) film supported on a SrTiO3(001) substrate. Annealing the crystals at > 600 °C causes encapsulation by a TiOx monolayer due to the strong metal–support interaction (SMSI). Scanning tunneling microscopy (STM) reveals that the TiOx monolayer on the Pd(111) facets consists of two periodicities: one is a hexagonal (4 × 4)R1.5° structure, and the other is a larger-scale periodicity consisting of a two-fold symmetric pattern of dark regions that can be described by a (4√39 × 4√61)R42.4° superstructure. This double-periodicity structure requires a formation area of at least 100s of nm2. An atomic model is developed that encompasses all features of the moiré superstructure.
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