Dresden 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 15: C/diamond I

HL 15.2: Talk

Tuesday, March 24, 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.