Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 59: Goup IV elements and their compounds I
HL 59.7: Vortrag
Mittwoch, 13. März 2013, 16:30–16:45, H15
Covalent functionalization of carbon nanotubes with tetramanganese complexes — •Robert Frielinghaus1,5, Claire Besson1,2,5, Anna-Katharina Saelhoff1,5, Asmus Vierck3, Marlou Slot1,5, Lothar Houben1,4,5, Janina Maultzsch3, Paul Kögerler1,2,5, Claus M. Schneider1,5, and Carola Meyer1,5 — 1Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institut für Anorganische Chemie, RWTH Aachen, 52074 Aachen, Germany — 3Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 4Ernst Ruska Center for Microscopy and Spectroscopy with Electrons, 52425 Jülich, Germany — 5JARA – Fundamentals of Future Information Technologies
We present first results on the covalent chemical functionalization of carbon nanotubes (CNTs) with tetramanganese coordination complexes. Raman spectra give indirect evidence of a successful reaction. It can only be achieved for tubes which contain defects with carboxylic groups. Changes in the magnetization behavior of the complexes due to the bonding to the CNTs are analyzed with temperature-dependent SQUID measurements. These results are correlated with bright and dark field high-resolution transmission electron microscopy (HR-TEM) measurements that show the repartition of the complex decoration on the CNTs. The TEM’s elemental analysis capabilities, energy-dispersive X-ray and electron energy loss spectroscopy, prove the existence of Mn on the CNTs. We show that a mild oxidation, leaving the nanotubes conductive, is already sufficient for functionalization. This is important for the fabrication of transport devices.