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O: Fachverband Oberflächenphysik

O 76: Nanostructures at surfaces: Wires, tubes

O 76.1: Vortrag

Donnerstag, 25. März 2010, 15:00–15:15, H38

Tuning Ag nanowire growth on Cu(110) based templates — •Thorsten Wagner, Thomas Brandstetter, and Peter Zeppenfeld — Johannes Kepler University Linz, Institute of Experimental Physics, Austria

The Cu(110) surface can be readily structured by adsorbing oxygen: If the coverage of oxygen is less than required to form a complete (2×1) overlayer, CuO stripes are formed which are separated by bare copper areas. These stripes are regularly arranged and parallel to the [001] direction. On such an oxygen pre-covered surface silver was adsorbed at 660 K. As revealed by scanning tunneling microscopy, submonolayer silver coverages lead to a phase separation between CuO and a Ag/Cu alloy [1]. The original Cu-CuO stripe phase is destroyed and larger CuO areas (‘ponds’) are formed. The ponds are separated by Ag rich stripes which are again parallel to the [001] direction. These template surfaces can be used to manipulate the further growth of Ag nanowires at 300 K. Since on our template, the nanowires grow only on the Ag rich stripes, their extension along the [110] direction is limited by the width of these stripes. By carefully choosing the parameters for the preparation of the template, one can even produce Ag nanowires which are aligned along [001] direction, which is perpendicular to the natural extension of Ag nanowires on pure Cu(110).

[1] Brandstetter et al., Surf. Sci. 603, 3410-3413 (2009)