Charging of metal adatoms on ultrathin oxide films: Au and Pd on FeO/Pt(111).
We present a combined experimental (STM/scanning tunneling spectroscopy) and theoretical (density functional theory) study on the deposition of Au and Pd metal atoms on FeO/Pt(111) ultrathin films. We show that while the Pd atoms are only slightly oxidized, the Au atoms form positive ions upon deposition, at variance to a charge transfer into the Au atoms as observed for MgO/Ag(100). The modulation of the adsorption properties within the surface Moiré cell and the charging induce the formation a self-assembled array of gold adatoms on FeO/Pt(111), whereas Pd atoms are randomly distributed.
Giordano
Livia
L
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via Cozzi, 53-20125 Milano, Italy.
Pacchioni
Gianfranco
G
Goniakowski
Jacek
J
Nilius
Niklas
N
Rienks
Emile D L
ED
Freund
Hans-Joachim
HJ