Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Nanostructures at surfaces: Dots, particles, clusters

O 23.6: Vortrag

Dienstag, 23. März 2010, 11:45–12:00, H33

Towards nanocatalytic and -magnetic applications of cluster superlattices on the Ir(111)/graphene moiré — •Timm Gerber, Alpha T. N'Diaye, Carsten Busse, and Thomas Michely — II. Physikalisches Institut, Universität zu Köln

The graphene moiré on Ir(111) is a versatile template for the growth of well ordered cluster superlattices. Employing a newly developed method to ensure full graphene coverage without any rotational variants, we demonstrate entire sample coverage with a cluster superlattice. As a second step towards applications we introduce methods to enhance the thermal stabilty of cluster superlattices and to keep them intact under ambient conditions. In view of nanocatalytic applications we investigated formation and thermal decay of Au and Pt cluster superlattices. The interaction of Pt clusters upon adsorption of CO and O is reported. For the ferromagnetic metals Co, Fe, Ni and for Rh (being magnetic as small clusters) we investigated the ability to form cluster superlattices. For those elements that do not form cluster superlattices upon room temperature deposition cluster seeding with Ir or Pt was employed. The latter offers the possibility to create bimetallic clusters such as FePt and CoPt.