Author/Authors :
G. and Gragnaniello، نويسنده , , L. and Agnoli، نويسنده , , S. and Parteder، نويسنده , , G. and Barolo، نويسنده , , A. and Bondino، نويسنده , , F. and Allegretti، نويسنده , , F. and Surnev، نويسنده , , S. and Granozzi، نويسنده , , G. and Netzer، نويسنده , , F.P.، نويسنده ,
Abstract :
The growth of interface-stabilized cobalt oxide (CoOx) nanolayers on Pd(100) has been investigated and their structures are reported as a function of coverage. Several different phases have been observed by LEED and STM experiments, and they have been characterized spectroscopically by photoemission and X-ray absorption. The data indicate that in the low coverage regime (up to ΘCo ≈ 2–3 ML) rock-salt CoO type phases are formed (defective in the single layer regime, and stoichiometric in multilayers) with (100) or (111) termination. At higher coverage (ΘCo ≈ 10–20 ML) spinel Co3O4(111) and CoO(100) layers have been detected, in ratios dependent on the preparation conditions. The observed structures are discussed in relation to similar structures reported recently for CoOx films on Ir(100) [W. Meyer et al., J. Phys.: Condens. Matter 20 (2008) 265011].
Keywords :
Ultra-thin films , Scanning tunneling microscopy (STM) , Low energy electron diffraction (LEED) , Photoelectron spectroscopy (PES) , X-ray absorption spectroscopy (XAS) , Cobalt oxides , Palladium (100)
