Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.25: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
MonSm- and WnSm-clusters: Nano-platelets and nano-wires — •Wilko Westhäuser, Tim Fischer, Nils Bertram, Jörn Cordes, Rainer Dietsche, Moritz Bubek, and Gerd Ganteför — University of Konstanz, Department of Physics, D-78457 Konstanz
Clusters of the layered semiconductor materials MoS2 and WS2
may form fullerenes similar to carbon. Therefor, we used gas phase
mass and photoelectron spectroscopy in combination with Density
Functional Theory calculations in order to investigate small
MonSm- and WnSm-clusters. E. g. the
Mo4S6-clusters revealed a large HOMO-LUMO gap (about 2eV)
indicating to be a so-called “magic cluster” with a high
stability and chemical inertness [1,2].
In mass spectra of MonSm- and WnSm-clusters with n>5
atoms the theoretically predicted stable 2-d triangular platelet
structures were detected and 1-d chain-like clusters of the
stoichiometry Mo3nS3n+2 were identified and
characterised with PES. In addition, selected clusters were
deposited in soft-landing mode on HOPG-, Au- and Ag- substrates in
order to study the interaction of the clusters with the metal
surfaces via XPS, AES and HREELS.
[1] N. Bertram, Y. D. Kim, G. Ganteför, Q. Sun, P. Jena, J. Tamuliene and G. Seifert, Chem. Phys. Lett. 396, 341 (2004).
[2] S. Gemming, J. Tamuliene, G. Seifert, N. Bertram, Y. D. Kim and G. Ganteför, Applied Physics A (2005), online available.