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Spectroscopic studies on electrochemically doped and functionalized single-walled carbon nanotubes♣

P. M. RAFAILOV1,* , T. I. MILENOV1, M. MONEV2, G. V. AVDEEV2, C. THOMSEN3, U. DETTLAFF-WEGLIKOWSKA4, S. ROTH4

Affiliation

  1. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  2. Acad. R. Kaishew Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
  3. Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
  4. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany

Abstract

We carried out electrochemical n- and p-doping of bundled single-walled carbon nanotubes (SWNTs) in KCl aqueous solutions. The doping effects were studied by Raman spectroscopy and energy-dispersive X-ray analysis as well as with Xray diffraction. While n-type doping takes place in the double-layer charging regime up to high cathodic potentials, a transition from double-layer type to intercalative doping and functionalization of the SWNTs occurs upon exposing them to high anodic potentials, especially exceeding the Cl-oxidation potential. Significant differences in the spectroscopic response of metallic and semiconducting SWNTs are encountered and analysed. We show that this electrochemical functionalization impacts upon the morphology of the SWNT bundles and has a partial de-bundling effect..

Keywords

Carbon nanotubes, Raman Spectroscopy, Electrochemical Doping, Functionalization.

Submitted at: Nov. 5, 2008
Accepted at: Sept. 9, 2009

Citation

P. M. RAFAILOV, T. I. MILENOV, M. MONEV, G. V. AVDEEV, C. THOMSEN, U. DETTLAFF-WEGLIKOWSKA, S. ROTH, Spectroscopic studies on electrochemically doped and functionalized single-walled carbon nanotubes♣, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 9, pp. 1339-1342 (2009)