Kornelius Nielsch studied physics at the Mercator University in Duisburg (1993–97) and conducted his diploma work at the University of Lund. His Ph.D. was carried out at the Max-Planck-Institute in Halle, Germany. From 2002 he worked as a postdoctoral associate at the MIT. From 2003 he was leading a research group on “Multifunctional Nanowires and Nanotubes” at the Max-Planck-Institute in Halle. Nielsch was appointed as professor for Experimental Physics at the University of Hamburg in 2007. He has co-authored more than 100 refereed journal publications. He was acknowledged as one of the world’s top 100 materials scientists over the last decade (2000-2010) by Thomson Reuters, recently. Since 2009 he coordinates the German Priority Program of Thermoelectric Nanostructures, funded by the German Science Foundation.
His Topic of Materials' Days 2011:
Template based Synthesis of 3D Nanostructures by Atomic Layer Deposition
Multifunctional Cylindrical Nanoobjects: From ALD Growth towards Physical Model Systems
A broad range of potential applications of magnetic nanostructures have been developed in the recent years. Magnetic data storage, microelectronics, or biomedical uses such as cell separation or biosensing present a special interest among these applications. Atomic layer deposition (ALD) is a very suitable method for the conformal deposition of magnetic thin films in pore structures of high aspect ratio, while offering the precise tuning of the layer thickness and high uniformity .
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 by using SQUID magnetometry and compared with magnetic simulations. We will discuss the properties of magnetic multi-layered nanotubes (core-shell) and the application of conformal magnetic coatings of other template systems and 3D nanostructures.
Furthermore, thermoelectric materials might play an increasing role for the efficient use of energy resources and waste heat recovery in the future. We have grown nanowires of V-VI semiconductors by cyclic vapour liquid solid growth mode . The synthesized Sb2Se3 and Sb2S3 nanowires have been applied successfully as three dimensional substrates for epitaxial atomic layer deposition at low temperatures starting at 90 °C. The presentation will be completed by the presentation of selected results on template-based synthesis of magnetic and oxides nanostructures by atomic layer deposition.
1. M. Knez, K. Nielsch, L. Niinistö, Advanced Materials 19, 3425-3438 (2007).
2. J. Bachmann, K. Nielsch et al., JACS 129, 9554 (2007).
3. R.B. Yang, K. Nielsch et al., Advanced Materials 21, 3170 (2009).