Berlin 2008 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster
DF 9.9: Poster
Dienstag, 26. Februar 2008, 15:00–18:00, Poster G
Charge transport in composite-materials containing carbon nano-tubes and carbon nano-fibers — •Michael Konter1, Pablo Carballeira2, Frank Haupert2, Bernd Wetzel2, Alois K. Schlarb2, and Rolf Pelster1 — 1Fachrichtung 7.2 Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany — 2Institut für Verbundwerkstoffe GmbH, Kaiserslautern, Germany
We have investigated the electric transport properties of composite materials using temperature dependent dielectric spectroscopy (200 Hz - 2 GHz, 70 K - 290 K). The samples consist of epoxy-resin containing up to 2 vol. % carbon nano-tubes and carbon nano-fibers, respectively. The dispersion was achieved with a torus mill and / or a three roll calender device. We observe percolation as well as an associated polarization process. Its characteristic frequency and its dielectric strength are correlated with the dc-conductivity. This behaviour is discussed in terms of the micro-structure.