Dresden 2009 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 29: Nanoengineered Thin Films II
DS 29.3: Vortrag
Donnerstag, 26. März 2009, 11:45–12:00, GER 37
Self-organization in metal containing amorphous carbon nanocomposites — •Hayo Zutz1, Dominika Lyzwa1, Carsten Ronning2, Michael Seibt3, and Hans Hofsäss1 — 1II.Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1,37077 Göttingen — 2Institut für Festkörperphysik, Universität Jena, Max-Wien-Platz 1, 07743 Jena — 3IV.Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1,37077 Göttingen
Carbon based nanocomposites gained much interest in the last years. The low energy ion deposition using a mass selected ion beam with carbon and metal quasi-simultaneously allows the formation of various compounds. Gerhards et.al. found a self-organization process resulting in alternating metal-rich and metal deficient layers with layer periods in the nm range for a-C:Au and a-C:Fe[1]. The self-organization process occurs in a certain parameter regime for ion energies and C+/metal+ fluence ratios. By proper selection of the fluence ratio it is possible to deposit metal-carbon nanocomposite films with homogenously distributed metal clusters in an a-C matrix or a multilayer structure. In this presentation we will discuss results for the a-C:Cu and a-C:Ni system. The films are analyzed by Rutherford backscattering spectroscopy, energy dispersive X-ray spectroscopy and cross-section transmission electron microscopy. For both systems the results are in agreement with predictions and the model developed in [1] based on an interplay of sputtering, surface segregation and ion induced diffusion. Extensions to the simple model based on the new results will be discussed. [1] I Gerhards et.al., PRB70(2004)245418.