Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 84: Poster: Electronic structure theory / Carbon (other than graphene) / Si, Ge, and SiC / III-V semiconductors (other than nitrides)
HL 84.5: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Magnetotransport in carbon nanotube networks functionalized with tetranuclear metal complexes — •Marlou Slot1,4, Michael Schnee1,4, Claire Besson1,2,4, Fabian Fritz1,4, Robert Frielinghaus1,4, Lothar Houben1,3,4, Christopher Nakamoto1,4, Paul Kögerler1,2,4, Claus M. Schneider1,4, and Carola Meyer1,4 — 1Peter Grünberg Institut, Forschungszentrum Jülich, Germany — 2Institut für Anorganische Chemie, RWTH Aachen, Germany — 3Ernst Ruska-Centre, Forschungszentrum Jülich, Germany — 4JARA - Fundamentals of Future Information Technologies
Carbon nanotubes (CNTs) exhibit outstanding electronic and spin transport properties. These properties can be manipulated by chemical functionalization. We present CNT networks, grown by chemical vapor deposition, to which tetranuclear cobalt(II), manganese(II) and zinc(II) coordination complexes are attached. In contrast to commonly used van der Waals bonding, where the molecular orientation with respect to the CNT is arbitrary, we fix the angle between CNT and complex using covalent functionalization. Since the chemical route is based on carboxylate ligand exchange, oxidation of the CNTs before the functionalization is required. Raman spectroscopy is used to optimize the oxidation with respect to the desired density of carboxylate groups and the resistance of the CNT network. Magnetotransport measurements at temperatures down to 3 K show a resistance increase towards lower temperatures and a negative magnetoresistance. The underlying transport mechanism and the effect of the functionalization with magnetic complexes on the magnetoresistance are analyzed.