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 59.8: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Characterization of Fe2O3-Nanotubes prepared by ALD — •Markus Sproll1, Ulf Wiedwald1, Christian Pfahler1, Alfred Plettl1, Paul Ziemann1, and Julien Bachmann2 — 1Institut für Festkörperphysik, Universität Ulm, D-89069 Ulm — 2Institut für Angewandte Physik, Universität Hamburg, D-20355 Hamburg
Metallic nanoparticles from a micellar technique or colloidal polystyrene (PS) particles with diameters of 100 nm are used to generate nanomasks on Si and SiO2. Dip-coating the latter ones onto a pre-treated substrate permits the deposition of monolayers over areas up to 20 mm2. Anisotropic separation and subsequent isotropic etching in an oxygen plasma reduces the size of the PS-particles down to the desired diameter. In case of the metallic Nanoparticles, the diameter can be varied by photoseeding [1]. Using both types of particles as a mask for anisotropic reactive ion etching (RIE), arrays of nano-pores can be fabricated with variable depth and diameter [2].
An Atomic Layer Deposition (ALD) process with ferrocene is used to refill the pores. After removing the top layer on the substrate, the remaining magnetic nanotubes can be investigated. In a furnace or a hydrogen plasma the Fe2O3 tubes are reduced to Fe3O4 or even metallic Fe. SQUID measurements of all these states will be presented.
0pt[1] A. Seidenstücker - poster at this conference,
[2] A. Plettl et al., Adv. Funct. Mater. 19, 3279 (2009).