EP2
14.11.2016 - Dr. KATEŘINA HERYNKOVÁ
Dr. Kateřina Herynková, Martin Müller und Dr. Ondrej E. Cibulka vom Department of Thin Films and Nanostructures, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic waren zu Gast bei Jun.-Prof. Dr. Jan Benedikt. Im Rahmen dessen hielt Dr. Kateřina Herynková einen Vortrag über "Luminescing silicon nanoparticles for optoelectronic and biological applications". Außerdem wurde der Bochumer Weihnachtsmarkt besucht.
Abstract: Silicon nanoparticles have potential application in so-called all-silicon optoelectronics or in biology as luminescent markers or optically controlled drug delivery. Silicon nanocrystals having 2-3 nm in size show visible luminescence due to the quantum confinement effect and organic (methyl) capping of the nanoparticles can enhance luminescence efficiency up to 20%. The native indirect bandgap of the silicon is in tensile-strained nanoparticles switched to direct bandgap behavior. By modifying the preparation conditions of the highly porous silicon we obtain hydrophilic nanoclusters suitable for biological research, however, the nanoparticles tend to agglomerate. Study of their toxicity showed better viability of the cells in comparison with diamond nanocrystals.
