Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.92: Poster

Thursday, March 19, 2015, 09:30–12:00, Poster A

Spatial Patterning of molecule modified surfaces — •Johannes Völkner and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, 35032 Marburg

Self-assembling monolayers (SAMs) are commonly used for modification of metal surfaces with molecules. It results in a variation of surface properties such as wetting behavior, friction and biofunctionality. Microcontact printing (muCP) enables lateral patterning of such layers by spatially controlled adsorption of molecules through a polysiloxane matrix. It opens the possibility to structure further layers on top, for instance, containing nanoparticles and proteins with different properties.

Here, an array of alternating methyl- and hydroxyl-terminated molecule regions is fabricated. Hence exhibiting hydrophobic and -philic character, the layer serves as template for selective assembly of respectively coated nanoparticles. Optical and fluorescence micrographs reveal the microstructure of juxtaposed regions of nanoparticles exhibiting different photoelectric character. Furthermore, AFM and DLFM serve as means to image patterns on small scale. This successful and reproducible spatial arrangement of nanoparticles is a mandatory step towards the realization of multi-analyte photoelectrochemical detection systems which are based on a spatially resolved optical excitation of functionalized quantum dot arrays.