Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 38: Layer Properties: Electrical, Optical and Mechanical Properties

DS 38.3: Vortrag

Donnerstag, 25. März 2010, 14:30–14:45, H8

Preparation of polymer/metal-multilayers by pulsed laser deposition — •Susanne Seyffarth, Britta Lena Fuchs, Sarah Hoffmann, Inga Knorr, Cynthia Volkert, and Hans-Ulrich Krebs — Institut für Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen

Polymer/metal multilayer structures are model systems to study the mechanical behaviours of composite materials. Layered polymer/metal nanocomposites consisting of poly(methyl methacrylate) PMMA and Cu were deposited by pulsed laser deposition (PLD) at room temperature. At this, a laser fluence of 120 mJ/cm² close to the deposition threshold was used to obtain smooth PMMA films without droplets, while for Cu a much higher laser fluence of 6 J/cm² is necessary. On the smooth polymer layers, the metal shows Volmer-Weber island growth leading for thin Cu-films to layered PMMA/Cu nanostructures with spherical metallic particles. For larger metal layer thicknesses, the metal layers are closed and PMMA/Cu multilayers are formed. The composition of PMMA was studied by infrared spectroscopy (FTIR). Atomic force microscopy (AFM) was used to study the surface morphology. Cross-section slices of the layered structures cut by focused ion beam (FIB) were examined by electron microscopy (SEM, TEM). It was found that indeed well layered PMMA/Cu-structures can be formed by PLD, but stress formation leads to buckles and waves of the metal layers as long as the PMMA layers are soft. In this contribution it is discussed how smooth metal and polymer layers can be obtained.