Competition between Polar and Nonpolar Growth of MgO Thin Films on Au(111) (Articolo in rivista)

Type
Label
  • Competition between Polar and Nonpolar Growth of MgO Thin Films on Au(111) (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • S. Benedetti, N. Nilius, P. Torelli, G. Renaud, H.-J. Freund, S. Valeri (2011)
    Competition between Polar and Nonpolar Growth of MgO Thin Films on Au(111)
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S. Benedetti, N. Nilius, P. Torelli, G. Renaud, H.-J. Freund, S. Valeri (literal)
Pagina inizio
  • 23043 (literal)
Pagina fine
  • 23049 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 115 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • +Dip. Fisica, Università di Modena e Reggio Emilia, Via Campi 213A, I-41125 Modena, Italy ?Centro S3, Istituto Nanoscienze?CNR, Via Campi 213A, I-41125 Modena, Italy §Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany ||CEA-Grenoble, Institut Nanoscience et Cryog?enie/SP2M/NRS, 17 rue de Martyrs, 38054 Grenoble, France (literal)
Titolo
  • Competition between Polar and Nonpolar Growth of MgO Thin Films on Au(111) (literal)
Abstract
  • We report a growth study of MgO thin films on an Au(111) support, performed with scanning tunneling microscopy, X-ray photoelectron spectroscopy, and low-energy-electron and X-ray-diffraction techniques. Depending on the deposition temperature, the O2 partial pressure, and the availability of water during oxide formation, two growth regimes can be distinguished. At high oxygen pressure, the MgO mainly adopts a square-lattice configuration and exposes the nonpolar (001) surface, whereas at low O2 pressure a hexagonal lattice develops that resembles the (111) surface of rocksalt MgO. For films beyond the monolayer limit, the emerging electrostatic dipole along theMgO(111) direction becomes important for the film morphology. Depending on the preparation conditions, the system takes either structural or adsorption-mediated routes to remove the polarity. Whereas surface roughening is identified as main polarity-compensation mechanism at perfect vacuum conditions, hydroxylation becomes important if water is present during oxide growth. (literal)
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