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CPP: Chemische Physik und Polymerphysik

CPP 14: Self Assembled Layered Systems

CPP 14.3: Talk

Thursday, April 5, 2001, 16:25–16:45, 112

Film formation of thiol-modified polyethylene glycol on gold — •Shuzo Tokumitsu, Sascha Herrwerth, Wolfgang Eck, Michael Himmelhaus, and Michael Grunze — Lehrstuhl für Angewandte Physikalische Chemie, Universität Heidelberg

The self-assembly of thiol-modified polyethylene glycol (PEG: 2000 dalton) on polycrystalline gold films from dilute solution has been studied by means of ellipsometry, infrared spectroscopy, X-ray photoelectron spectroscopy and optical second harmonic generation. A rapid coverage increase up to 44% of the complete monolayer is found within the first 10 min of immersion, followed by a slowly proceeding adsorption step. Final coverage is reached after a total immersion time of about 2 hours. The results for film thickness and structure obtained by the various in-situ and ex-situ methods will be discussed in detail, indicating a restructuring of the PEG moiety from an amorphous phase at low coverage to a crystalline-like phase at final coverage.