Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 37: Poster II: Focused electron beam induced processing for the fabrication of nanostructures (focused session, jointly with O); Nanoengineered thin films; Layer properties: electrical, optical, and mechanical properties; Thin film characterization: structure analysis and composition (XRD, TEM, XPS, SIMS, RBS,..); Application of thin films

DS 37.11: Poster

Donnerstag, 29. März 2012, 15:00–17:00, Poster E

Controlling the properties of laser deposited polymer-metal nanocomposites close to the percolation threshold — •Felix Schlenkrich, Susanne Schlenkrich, and Hans-Ulrich Krebs — Institut f. Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Polymer-metal nanocomposites consisting of metal clusters embedded in a polymer are of interest for many applications, for instance in microelectronics or sensor technology. For sensors, most interest lies especially in the region close to the percolation threshold, where the film properties drastically change. Such nanocomposites were pulsed laser deposited at 248 nm at fluences of 120 mJ/cm² in the case of polymers (Polymethyl methacrylate and Polycarbonate) and 4 J/cm² for metals (Ag, Cu). Enhancing the metal amount within these samples the transition from isolated metal clusters to closed metal layers was studied by electron microscopy and resistance measurements. In this contribution we discuss, how the structural and electrical properties of the composite films depend on the amount of metal deposited on the polymer, the reactivity between metal and polymer, hardness of the polymer, and electrical properties of the components. Then we concentrate on the region close to the percolation threshold, where the electrical conductivity is strongly influenced by the microstructure, and show, how the properties of the polymer/metal composite films can be controlled by heat treatments.