Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 9: Organic films I

O 9.10: Talk

Monday, March 27, 2006, 17:15–17:30, TRE Phys

Electroless metal deposition on the surface of aromatic self-assembled monolayers — •Christoph T. Nottbohm, Andrey Turchanin, and Armin Gölzhäuser — Physik Supramolekularer Systeme, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld

We investigated the palladium-catalysed electroless deposition (ELD) of copper on amino-terminated, cross-linked biphenyl self-assembled monolayers (SAMs). Cross-linking as well as the generation of surface amino groups is achieved by irradiation with low-energy electrons. The cross-linked SAM acts as a diffusion barrier, suppressing the catalyst-free ELD of copper on the gold substrate. Immobilization of a catalyst on the surface of the SAM is achieved by the reduction of Pd(II) ions that are coordinated to the surface amino groups. This was verified by angle resolved X-ray photoelectron spectroscopy (APXPS). Using a stencil mask to locally generate surface amino groups, it was shown by atomic force microscopy that copper is only deposited in irradiated areas. This indicates that copper deposition occurs only at the catalytic site.