Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 13: Dusty Plasmas

P 13.3: Talk

Wednesday, March 30, 2022, 16:30–16:45, P-H11

Decoupling of dust cloud and embedding plasma for high electron depletion in nanodusty plasmas — •Andreas Petersen, Oguz Han Asnaz, Benjamin Tadsen, and Franko Greiner — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel

Understanding how dust particles can grow in a reactive plasma discharge and change its behavior, is an interesting topic, since nanoparticles (nps) have become key technological products, e.g. as coatings with tunable optical gap in third generation solar cells, as nanocrystals for photonic applications, and as pharmaceutical nanocarriers.

We have been able, to characterize an argon discharge with embedded amorphous hydrocarbon nps of different size and density, using self excited dust density waves (DDW) as a diagnostic tool.

Our results show, that the comparably high dust density (high Havnes parameter) leads to electron depletion and governs the charge of dust grains, while the size of the particles has only a weak influence on their charge. The ion density and electric potential profile are almost independent of both, dust size as well as dust density. This suggests, that the ion generation and the dust cloud coexist and the coupling of both is weak.