Guest: Kateřina Herynková

Guest: Kateřina Herynková

14.11.2016

Kateřina Herynková vom Department of Thin Films and Nanostructures, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic ist zu Gast bei Jun.-Prof. Dr. Jan Benedikt und hält am 15.11.2016 um 9:15 Uhr einen Vortrag über "Luminescing silicon nanoparticles for optoelectronic and biological applications" (NB 5/158). Interessierte sind herzlich willkommen!

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.

Department of Thin Films and Nanostructures