Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Metal substrates: Adsorption of organic / bio molecules V

O 40.3: Talk

Wednesday, March 16, 2011, 11:45–12:00, PHY C213

Adsorption behaviour of CoPc and CoTMPP on Cu(110) and Cu(110)-(2x1)O — •Daniel Queteschiner, Mariella Denk, Michael Hohage, and Peter Zeppenfeld — Institute of Experimental Physics, Johannes Kepler University Linz, A-4040 Linz, Austria

The geometric arrangement of cobalt-phthalocyanine (CoPc) and cobalt-tetra(4-methoxyphenyl)porphyrin (CoTMPP) on the Cu(110) and Cu(110)-(2x1)O surface was investigated for coverages up to 1 ML by a combination of reflectance difference spectroscopy (RDS), low energy electron diffraction (LEED), and scanning tunneling microscopy (STM).

On Cu(110) both molecules adsorb at room temperature in a 2D-gas. Upon cooling to T=14 K CoTMPP condenses into a well-ordered structure while for CoPc the gas phase is maintained.

On the oxygen reconstructed Cu surface, however, both CoPc and CoTMPP form well-ordered structures even at room temperature. Continuing the growth up to the saturated ML, the CoTMPP layer undergoes two coverage driven transitions between distinct superstructures.