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The European Physical Journal D

, Volume 45, Issue 3, pp 439–446 | Cite as

Self-assembly of Mo 6S 8 clusters on the Au(111) surface

  • I. PopovEmail author
  • T. Kunze
  • S. Gemming
  • G. Seifert
Geometrical Structure and Dynamics

Abstract.

The preferred adsorption sites and the propensity for a self-organised growth of the molybdenum sulfide cluster Mo6S8 on the Au(111) surface are investigated by density-functional band-structure calculations with pseudopotentials and a plane wave basis set. The quasi-cubic cluster preferentially adsorbs via a face and remains structurally intact. It experiences a strong, mostly non-ionic attraction to the surface at several quasi-isoenergetic adsorption positions. A scan of the potential energy surface exhibits only small barriers between adjacent strong adsorption sites. Hence, the cluster may move in a potential well with degenerate local energy minima at room temperature. The analysis of the electronic structure reveals a negligible electron transfer and S-Au hybridised states, which indicate that the cluster-surface interaction is dominated by S-Au bonds, with minor contributions from the Mo atom in the surface vicinity. All results indicate that Mo6S8 clusters on the Au(111) surface can undergo a template-mediated self-assembly to an ordered inorganic monolayer, which is still redox active and may be employed as surface-active agent in the integration of noble metal and ionic or biological components within nano-devices. Therefore, a classical potential model was developed on the basis of the DFT data, which allows to study larger cluster assemblies on the Au(111).

PACS.

61.46.-w Nanoscale materials 73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals 72.20.-i Conductivity phenomena in semiconductors and insulators 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  1. 1.Physikalische Chemie, TU DresdenDresdenGermany
  2. 2.Institute of PhysicsChemnitzGermany
  3. 3.Institute of Ion Beam Physics and Materials ResearchDresdenGermany

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