Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Poster Tuesday: Ultrafast Processes

O 45.9: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Suspended 2D-materials as targets for ps-ion source — Tobias Foller, Alexander Breuers, •Leonard Christen, Matthias Herder, Anke Hierzenberger, Andreas Wucher, and Marika Schleberger — Faculty of Physics, University of Duisburg-Essen, Germany

For a high yield in transmission experiments and experiments involving broad probing beams large area ultrathin targets are required. CVD-grown 2D materials are a suitable starting material for this purpose allowing possible applications [1] and experimental approaches [2,3]. Therefore, we have inherited [4] and adapted a new technique to fabricate large area suspended 2D-membranes. We start off with CVD-grown 2D material. Protected by a thin poly(methyl methacrylate) (PMMA) film the heterostructure is then transferred to a perforated substrate. Using the solvent replacement technique [4] PMMA is gently removed.

The duration of a secondary electron pulse is a direct image of the parent picosecond ion pulse. For our ion source creating picosecond pulses it is thus important to know the secondary electron emission and radiation hardness of the targets under Ar+ ion-irradiation. We have developed an experimental setup to investigate these characteristics.

[1] Cohen-Tanugi et al., Nano Lett., 7 (2012) pp 3602-3608 [2] Kotakoski et al., Nat. Commun. 5 (2014) 3991 [3] Gruber et al, Nat. Commun. 7 (2016) 13948 [4] Chen et al., Nanoscale 8 (2016) pp 3555-3564