Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.7: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Dewetting of Thin Gold Films on Flat and Nanostructured Polystyrene Surfaces — •Felix Lohmeyer, Daniel Kool, Philipp Hodges, and Jörg K. N. Lindner — Nanopatterning - Nanoanalysis - Photonic Materials, Department of Physics, Paderborn University, Germany

Limited knowledge exists regarding the wetting and dewetting behavior of ultra-thin metal films on polymer surfaces, although this understanding is crucial for advancing nanotechnology processes. We show that dewetting of thin metal films occurs below the polymer's melting point making it valuable for patterning purposes. We present preliminary results for 7 nm thin gold films deposited on polystyrene after thermal annealing. Different polymer substrates, including planar polystyrene films, a phase-separated PS-b-PMMA block-copolymer with a fingerprint nanostructure, and a nanostructured polystyrene surface obtained by selectively removing the PMMA matrix from an ordered block-copolymer film, are explored.

Dewetting degree is examined as a function of annealing time and temperature. The fraction of Au-covered surface is larger on fingerprint-patterned PS-b-PMMA surfaces than on pure planar PS films. On nanostructured PS films, gold decomposes upon annealing into rods, both on top of the PS fins and in the pattern valleys. These results illuminate the potential of dewetting on polymers for nanotechnology purposes.

Keywords: Solid State Dewetting; Gold thin film; Nanostructured polymers; block-copolymer lithography; PS-b-PMMA