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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Bio- and Molecular magnetism

MA 16.10: Vortrag

Dienstag, 17. März 2015, 12:00–12:15, EB 202

Magnetotransport in carbon nanotube networks: influence of morphology, oxidation, and covalent functionalization with tetranuclear metal complexes — •Marlou Slot1, Michael Schnee2,4, Claire Besson2,3,4, Robert Frielinghaus2,4, Paul Kögerler2,3,4, Claus M. Schneider2,4, and Carola Meyer2,41Debye Institute for Nanomaterials Science, Utrecht University, The Netherlands — 2Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Germany — 3Institut für Anorganische Chemie, RWTH Aachen, Germany — 4JARA - Fundamentals of Future Information Technologies

Carbon nanotube networks (CNTNs) are a promising material for applications in plastic electronics and spintronics, constituting an electrically and mechanically robust alternative to single CNTs. The range of possible applications is broadened by functionalization. Covalent functionalization with antiferromagnetic tetranuclear metal coordination complexes, facilitated by sidewall oxidation, results in a defined angle of the complex with respect to the tube and a net spin near the CNT.
Low-temperature electrical transport characteristics of the CNTNs, consisting of semiconducting and metallic tubes, exhibit a shift from localized hopping behavior to dominating metallic conduction upon increasing network density. Short thermal oxidation results in an enhanced conductivity. The CNTNs exhibit a negative magnetoresistance (MR). Covalent functionalization with {Co4}-complexes is observed to affect the magnitude of the MR at low temperatures, which corroborates the influence of these complexes on the transport in the CNTN.

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