Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.14: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Growth and photoluminescence of carbon-nanotubes laying on silicon substrates — •Peter Löptien1,2, Shigeru Moritsubo1, Tomoaki Murai1, and Yuichiro K. Kato1 — 1Institute of Engineering Innovation, University of Tokyo, Tokyo 113-8656, Japan — 2Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany
Carbon nanotubes are self-assembled one-dimensional systems with exceptional electronic properties. Depending on their structure they are either metallic or semiconducting. In this project, semiconducting carbon nanotubes were investigated with photoluminescence spectroscopy. Starting with a bare silicon wafer, islands were defined by e-beam-lithography. Cobalt acetate with silica nanoparticles were deposited as islands acting as catalysts in the chemical vapor deposition growth process. The obtained nanotubes on and in between the islands were revealed by scanning electron microscope images and Raman spectroscopy. According to our photoluminescence data and previous results, there is a signal from air-suspended carbon nanotubes, but no signal from carbon nanotubes laying on the wafer in between the islands. The samples were treated with surfactants in an attempt to obtain micelle-encapsulated nanotubes showing photoluminescence even when they are in contact with the surface.