Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 54: Nanostructures at surfaces II
O 54.4: Talk
Wednesday, March 28, 2012, 17:30–17:45, MA 042
Oxygen adatoms on the MoO2/Mo(110) surface: from nanoscale writing to oxide nanowires — •Olaf Lübben1, Sergey A. Krasnikov1, Sergey I. Bozhko1,2, Barry E. Murphy1, and Igor V. Shvets1 — 1School of Physics, Trinity College Dublin, Dublin, Ireland — 2Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russian Federation
Nanoscale writing using oxygen adatoms on the MoO2/Mo(110) surface is demonstrated by scanning tunneling microscopy (STM). Oxidation of metal surfaces can produce a variety of ordered oxide nanostructures and two-dimensional surface oxides, which are of great significance for heterogeneous catalysis. High-temperature oxidation of the Mo(110) surface forms well-ordered molybdenum oxide nanorows separated by 2.5 nm. Further oxidation results in perfectly-aligned double rows of oxygen adatoms, imaged by STM as bright protrusions. These adatoms can be removed from the surface in a controlled fashion by the STM tip. Tip movement along the surface can be used for controlled lithography, with a minimum feature size of just 5 nm. Finally, deposition of Fe on the oxygen-rich MoO2/Mo(110) surface leads to the formation of well-ordered Fe oxide nanowires with a zig-zag structure.