Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Nanostructures at Surfaces

O 35.7: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Production and deposition of mass-selected iron clusters on MoS₂ investigated with AFM — •Matthias Bohlen, Christoph Schröder, Dominik Wolter, and Heinz Hövel — Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany

In order to deposit iron clusters on various surfaces, we used a magnetron-sputter gas aggregation cluster source [1] and a semi-continuous time-of-flight mass selector [2]. For iron clusters the simulation of suitable target geometry was important. We deposited Fe_2000 ± 36 clusters with different coverages, from 1 % to 20 % of a cluster-monolayer, on different samples. Using a cleaved surface of a MoS₂ crystal, atomically flat on microscopic areas but providing some bonding of the clusters, we were able to use atomic force microscopy (AFM) and verify a narrow cluster height distribution. The change of the cluster size due to contact with air is discussed.

[1] H. Haberland, M. Mall, M. Moseler, Y. Qiang, Th. Reiners, Y. Thurner, J. Vac. Sci. Technol. A 12, 2925 (1994).

[2] B. von Issendorff, R.E. Palmer, Rev. Sci. Instru. 70, 4497 (1999).