Berlin 2008 – wissenschaftliches Programm
O 66.6: Vortrag
Donnerstag, 28. Februar 2008, 14:00–14:15, MA 041
fabrication of ordered cluster arrays on pre-structured surfaces — •Jian Zhang1, Violetta Sessi1, Jan Honolka1, Axel Enders1,2, and Klaus Kern1 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany — 2Dept. of Physics and Astronomy, University of Nebraska, Lincoln NE 68588, USA
We will present results on the fabrication of ordered cluster arrays on structured surfaces. Fe and Co clusters of less than 3 nanometer diameter were prepared by buffer layer assisted growth1 (BLAG). The advantage of this method is that the clusters are formed before they make contact with the substrate. Thus, their initial structure is not affected by the substrate. While the resulting clusters are randomly distributed on flat crystalline surfaces, we find that cluster ordering can be promoted with pre-structured surfaces. Two examples will be discussed. On stepped a Pt(997) surface the clusters are arranged along the steps after landing, resulting in linear chains of clusters. Hexagonally arrays of isolated clusters can be achieved on a periodically corrugated boron-nitride nanomesh template. Here, the clusters preferentially occupy the pores in the BN layer. High nanomesh filling is achieved by repeated cluster deposition cycles. However, the maximum nanomesh filling is still limited by the cluster diffusion on the nanomesh, as will be discussed.