SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 9: Atmospheric Pressure Plasmas and their Applications III

P 9.6: Vortrag

Mittwoch, 22. März 2023, 12:30–12:45, CHE/0089

Binary nanocrystal synthesis using atmospheric pressure plasmas — •Maren Dworschak¹, Martin Müller², Lorenz Kienle³, and Jan Benedikt¹ — ¹Institue of Experimental and Applied Physics,Kiel University, Germany — ²Institute of Physics, Czech Academy of Sciences, Czech Republic — ³Faculty of Engineering, Kiel University, Germany

Nanocrystals of binary or multinary compounds with group IV semiconductors offer great flexibility in composition, morphology and structure. The resulting tunable band gap is associated with enhanced optical properties and tuneable luminescence ranging from the UV to the near-infrared region. The variety of possible nanocrystals offers a great selection of materials for energy conversion and storage application, yet the synthesis of such compounds on the nanometer scale is still challenging due to the complexity of the synthesis process. We report on possible methods that could facilitate the generation of metal-silicide nanocrystals while using atmospheric pressure plasmas as a tool. Silicon nanocrystals are generated in the plasma source from the reactive gas silane. An additional electrode inserted in to the plasma can be coated with the metal of choice. When the electrode is heated, the metal evaporates and gets incorporated in the produced nanoparticles downstream of the jet. A second possible method involves a post synthesis in-flight annealing stage. Particles synthesized in the plasma jet pass through a furnace at 1100°C, in which the desired metal is present in gaseous phase. Here, the high temperature has proven to facilitates the formation of crystalline polyelemental compounds.