Dresden 2011 – scientific programme
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MO: Fachverband Molekülphysik
MO 20: Transport and Spectroscopy in Molecular Nanostructures II (related to SYMN, jointly with CPP)
MO 20.4: Talk
Thursday, March 17, 2011, 11:15–11:30, TOE 317
Electronic properties of semiconducting polymer nanotubes — •Thomas Plocke1, Matthias Müller1, Janina Maultzsch1, Christian Thomsen1, Andreas Stefopoulos2, Souzana Kourkouli3, Elina Siokou3, Kostas Papagelis3, and Joannis Kallitsis2,3 — 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Processes (FORTH-ICEHT), 26504, Patras, Greece — 3University of Patras, 26504, Patras, Greece
Single-walled carbon nanotubes were functionalized with different polymeric quinoline chains using the "`grafting from"' approach in order to combine the properties of the semiconducting polymers with those of the carbon nanotubes [1]. We perform a resonant Raman spectroscopy analysis to study the influence of the functionalization on the electronic properties and the optical transitions of the modified tubes. We observe that the electronic properties of the nanotube derivatives change due to doping effects caused by charge transfer between the tubes and the polymers. Interestingly, our results on different functionalized single-walled carbon nanotubes show frequency shifts for the Raman G-mode in both directions compared to the pristine material. The preparation pathway of the studied samples allows us to distinguish structural from electronic effects caused by the polymer and the metal ion.[1] A. A. Stefopoulos, S. N. Kourkouli, E. Siokou, K. Papagelis, M. Müller, T. Plocke, J. Maultzsch, C. Thomsen, J. K. Kallitsis; in preparation (2010).