Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 68: Nanostructured surfaces and thin films – Poster
O 68.6: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Reversible and persistent changes in nanofilms of the ionic liquid BMP DCA after application of an electric current — •Mirco Wendt1,2, Anton Schün2, Regina Lange2, Jens Berdermann1, Ingo Barke2, and Sylvia Speller2 — 1Deutsches Zentrum für Luft-und Raumfahrt, Institut für Solar-terrestrische Physik, Neustrlitz — 2Universität Rostock, Institut für Physik
1-Butyl-1-methylpyrrolidinium dicyanamide (BMP DCA) layers with a thickness of 10 to 20 nm were shown to be effective as charge mitigation layer in the context of spacecraft charging [1]. While at moderate exposures to electrons in a scanning electron microscope (10^12 e/m^2), no changes were observed, intense electron exposure led to irreversible damage with reversible alterations occurring at intermediate conditions. To better understand the conductive mechanism and how these layers react to the presence of excess electrons, ionic liquid nano-films on interdigitated electrodes were prepared and a voltage applied between them. The monitored currents indicated that charges were permanently transferred into the sample. Atomic force microscopy revealed changes to the film*s morphology as well as shifts in dynamic mode phase, indicating trapping of charges. These findings are compatible with theoretical studies, suggesting additional electrons in this particular ionic liquid do neither pair with cations nor form cation shells, but further reduce anions into a doubly negative charge state [2]. [1] Wendt et al., J. Space Weather Space Clim. 2024, 14, 18 [2] Xu et al., J. Phys. Chem. B 2015, 119, 2, 532-542
Keywords: ionic liquid; AFM; BMP DCA; charge transfer