Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.23: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Fabrication and Characterization of Self-Assembled and Self-Aligned Single-Walled Carbon Nanotubes — •Harald Budde, Nicolai Hartmann, Nina Rauhut, and Achim Hartschuh — Department Chemie und CeNS, LMU, München, Germany

We report on the fabrication of horizontally aligned single-walled carbon nanotube arrays and their electro-optical properties. The arrays were obtained via a simple solution-based evaporation method on different substrates and were characterized by atomic force and optical microscopy [1, 2]. The nanotube alignment was determined by polarization-sensitive photoluminescence (PL) measurements. Electrically contacted arrays exhibit ohmic transport characteristics. Upon applying a bias voltage, electroluminescence (EL) from semiconducting nanotubes could be detected [3]. We investigate the bias dependence of the electroluminescence and compare PL and EL spectra for the same sample position. Arrays of aligned nanotubes are rather robust and bright sources of broad range emission as compared to single nanotubes and could be useful for optoelectronic applications.

[1] P. Yunker, T. Still, M. Lohr, A. Yodh, Nature 476, 308-311, 2011.

[2] M. Engel, J. Small, M. Steiner, M. Freitag, A. Green, M. Hersam, P. Avouris, ACS Nano 2 (12), 2445-2452, 2008.

[3] M. Freitag, J. Chen, J. Tersoff, J. Tsang, Q. Fu, J. Liu, P. Avouris, Phys. Rev. Lett. 93 (7), 076803, 2004.