Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.2: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

THz conductivity of graphene films derived from functionalized graphene dispersions — •Christoph Testud, Martin Fabritius, Rolf Mülhaupt, Hanspeter Helm, and Markus Walther — Freiburger Materialforschungszentrum (FMF), Freiburg, Deutschland

We report THz conductivity measurements on functionalized graphene films over the frequency range 0.1-1.5 THz. The films have been produced by depositing dispersions of single graphene sheets on a substrate. The conductivity is measured by THz TDS (time domain spectroscopy), which represents a contactless and non-destructive characterization technique. To check our results for consistency we compared our extrapolated dc-values with results from four-point probe measurements. Material parameters such as plasma frequency or charge carrier scattering rates are extracted from fits to our data using the Drude Smith model, which accounts for reduced conductivity due to charge carrier localization on the few micrometer sized graphene sheets.