Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.86: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Preparation and characterization of phenylphosphonic acid self-assembled monolayers on ZnO substrates — •Alexandra Ostapenko and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Renthof 7,35032 Marburg, Germany

Metal oxides are promising materials for fabrication of organic/inorganic hybrid structures. Surface functionalization by means of self-assembled monolayers (SAMs) is a promising approach to tailor their electronic interface properties or to fixate molecular chromophores. However, in contrast to widely used SAMs on gold surfaces, the molecular interaction and stability of such films on metal oxides have been much less studied. Here we report on the formation, thermal stability and molecular orientation of phenylphosphonic acid (PPA) SAMs on the Zn- and O-terminated basal planes of ZnO crystals that were studied by combining x-ray photoelectron spectroscopy (XPS), near edge x-ray absorption fine structure spectroscopy (NEXAFS) and thermal desorption spectroscopy (TDS). In addition the effect of OH-precoating on the adsorption was studied and the film ordering on pristine and defective ZnO surfaces was compared.