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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 Meyer2,4 — 1Debye 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.