Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.47: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Band structure und electronic transport properties of cobalt decorated carbon nanotubes — Jan Sommer1, •Andreas Zienert2, and Jörg Schuster3 — 1Institute of Physics, Chemnitz University of Technology, 09126 Chemnitz, Germany — 2Center for Microtechnologies, Chemnitz University of Technology, 09126 Chemnitz, Germany — 3Fraunhofer Research Institution for Electronic Nano Systems, 09126 Chemnitz, Germany
Carbon nanotubes (CNTs) are promising candidates for replacing copper wires in novel interconnect structures. For such an application, it is necessary to use metallic CNTs in order to compete against conventional copper technology. However, only one third of the CNTs grown by chemical vapor deposition are metallic. A method for turning semiconducting CNTs into metallic ones would be highly desirable [1].
As a simple approach, we modeled the effect of a few cobalt atoms, placed on the surface of a semiconducting CNT, on band structure and transport properties by using density functional theory. Even a very small amount of cobalt could significantly alter the band structure by inducing spin polarized states near the Fermi energy. Transport calculations confirm, that the conductivity of the semiconducting single-wall CNT is significantly increased. Furthermore, we present results about the geometry of the cobalt decorated CNT and the influences on band structure and transport.
[1] Kim et al. ACS Nano 3, 2818 (2009)