Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 1: Layer properties: electrical, optical, and mechanical properties

DS 1.6: Vortrag

Montag, 26. März 2012, 10:45–11:00, H 0111

Stress induced buckling in laser deposited polymer/metal-nanocomposites — •Susanne Schlenkrich, Felix Schlenkrich, Inga Knorr, Cynthia Volkert, and Hans-Ulrich Krebs — Institut für Materialphysik, Universität Göttingen, Friedrich Hund Platz1, 37077 Göttingen

Multilayer thin films with dimensions at the nanometer scale represent a technologically important class of materials where the interface and size effects play an important role. Interestingly, when polymer/metal multilayers are deposited by pulsed laser deposition (248nm, 30ns pulse duration) one observes stress induced buckling of the metal layers in case of polymers with low young*s modulus. Compressive stress in the metal layers is induced due to the high energy of the deposited ions. The beam theory can be used to describe the relation between the wavelength of the buckles and the properties of both film components. This understanding makes it possible to use the wavelength as a measurement for the mechanical properties of the film components. Furthermore, the wavelength can be tuned by changing/adjusting the layer thicknesses of both components. In this contribution buckling effects of these periodic structures are discussed and a new measurement technique to characterize the mechanical properties of extremely soft and thin films will be presented.