Dresden 2009 – wissenschaftliches Programm
HL 15.2: Vortrag
Dienstag, 24. März 2009, 09:45–10:00, POT 51
Characterization of Peapods synthesis from CVD grown Carbon Nanotubes — •Christian Spudat, Carola Meyer, Karin Goss, Paul Kögerler, and Claus M. Schneider — Forschungszentrum Jülich, Institut für Festkörperforschung, Electronic Properties (IFF-9), 52425 Jülich
Because of their ballistic conductance Carbon Nanotubes (CNTs) are a promising material for spintronic devices. Their magnetic and electronic properties can be altered by functionalization. This can be done by side groups sticking on the outside or the inside of the CNTs or by filling the inner hollow of CNTs with guest molecules. When C60 is used as a guest molecule the resulting structure is called a "peapod". In this talk we present a characterization of the different step towards peapods synthesized from CVD grown CNTs using HRTEM measurements. But even at electron energies as low as E=80 keV individual CNTs and especially C60 molecules are destroyed during electron irradiation indicated by the collapse of sidewalls and coalescence of interior C60. Therefore we use Raman spectroscopy as a non-destructive method to characterize nanotubes during different steps of the peapod synthesis and correlate these measurements with our microscopic results. This comparison between spectroscopy and microscopy allows us to investigate changes in the Raman spectra during different synthesis steps and allocate them to the microscopic images to get a better understanding of different changes in the Raman spectra of CNTs during peapod synthesis.