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May 3, 2011 11:00 - 12:00

Empa, Dübendorf, Theodor-Erismann-Auditorium, VE102


Prof. Dr Kornelius Nielsch, Institute of Applied Physics, University of Hamburg

Leadership of diskussion

Dr Ivo Utke, Empa


Monodisperse nanotubes and nanorods are highly desirable for many applications in magnetic storage, energy harvesting and for biomedical applications. Atomic layer deposition (ALD) is a very suitable method for the conformal deposition of thin films in pore structures, while offering the precise tuning of the layer thickness. Several examples will be shown on the synthesis of nanowires and nanotubes based on ferromagnetic and thermoelectric materials. 
By ALD coating of self-ordered Al2O3 membranes, arrays of magnetic nanotubes with diameters down to 20 nm and wall thicknesses of less than 5 nm have been achieved. The magnetic properties of the nanotube arrays as a function of wall thickness and tube diameter have been studied. The properties of magnetic multi-layered nanotubes (core-shell) will be discussed.  
Furthermore, thermoelectric materials might play an increasing role for waste heat recovery in the future. Nanowires of V(VI) semiconductors have been produced by cyclic vapour liquid solid growth mode. The Sb2Se3 and Sb2S3 nanowires have been applied as three dimensional substrates for epitaxial ALD at low temperatures. The lecture will be completed by the presentation of selected results on template-based synthesis of magnetic and oxides nanostructures by ALD.



The language of the presentation is English.
Free entrance, guests are welcome

Vortragssprache: Englisch


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