Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 28: Poster Session II

MM 28.17: Poster

Dienstag, 17. März 2015, 18:30–20:30, Poster E

Laser assisted fabrication of chalcogenide nanostructures with tailored morphology — •Thomas Vasileiadis1,2 and Spyros N. Yannopoulos11Foundation for Research and Technology Hellas, Institute of Chemical Engineering Sciences (FROTH/ICE-HT), P.O. Box 1414, GR-26504, Rio-Patras, Greece — 2Fritz Haber Institut der Max Planck Gesellschaft, Faradayweg 4 - 6, D - 14195 Berlin, Germany

Low dimensional nanostructures of chalcogens and chalcogenides have attracted considerable attention over the last years. Here we present a simple and cost effective laser-assisted method for the growth of low dimensional nanostructures based on functional chalcogenides. Te nanotubes can be easily prepared via cw laser ablation in a one-step method. By changing the irradiation conditions different morphologies arise in a controllable way, such as t-Te nanospheres. Differences in the morphology control are observed for elemental Se, a good glass-former. This synthetic strategy can be readily applied in many other functional chalcogenides e.g. As2S3 and phase-change materials, e.g. GeTe. Since chalcogenides are mostly famous for their sensitivity to external stimuli such as light, post-treatment of the resulting nanostructures with low light fluence is also investigated. A series of light-driven phase transition is employed to controllably transform Te nanotubes to core-Te/sheath-TeO2 and/or even neat TeO2 nanowires.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin