Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.38: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
STM study of the adsorption of phthalocyanine molecules on anisotropic surfaces — •Tobias Pertram1, Qihui Wu2, Conrad Becker1, and Klaus Wandelt1 — 1Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstr. 12, 53115 Bonn, Germany — 2Department of Physics, La Trobe University, Victoria 3086, Australia
The {1 1 0} surfaces of fcc metals show an intrinsic anisotropy due to the rectangular surface unit cell. This anisotropy can be even more pronounced in the case of the (1 × 2) missing row reconstruction, which has been found for metals such as Pt and Au. In contrast, on Pd(1 1 0) this reconstruction is only stable after the adsorption of hydrogen [1]. The clean Pd(1 1 0) does not show the tendency to reconstruct. After deposition of small amounts of Au (< 1 ML) on the unreconstructed Pd(1 1 0) surface pseudomorphic Au islands are observed, whereas in the case of higher Au amounts (> 2 ML) the resulting Au layer shows the characteristic (1 × 2) reconstruction, which however is still remains pseudomorphic to Pd(1 1 0) [2]. We used both reconstructed surfaces, the hydrogen induced Pd (1 1 0)-(1 × 2) surface and the Au modified one as a substrate for the deposition of phthalocyanine molecules. STM investigations under UHV conditions reveal a specific adsorption behaviour of the phthalocyanine molecules, which are oriented along rows of the reconstructed surfaces (“template effect”).
[1] M. Kralj, C. Becker, K. Wandelt, Surf. Sci. 600, 4113 (2006)
[2] M. Kralj et al. Surf. Sci. 600, 2614 (2006)