Regensburg 2025 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 1: Thin Film Properties
DS 1.5: Vortrag
Montag, 17. März 2025, 10:45–11:00, H3
Low temperature solid state dewetting of gold thin films on polystyrene nano structures — •Felix Lohmeyer and Jörg K.N. Lindner — Universität Paderborn, Department Physik, Warburgerstraße 100, 33098 Paderborn
Solid-state dewetting describes the breakup of a thin film into isolated objects due to surface energy minimization below the material’s melting point. While well-studied for hard substrates, little research has been done on the dewetting of metal thin films on polymer substrates. This study shows that gold thin films can undergo dewetting at temperatures that preserve the underlying polymer substrate, with dewetting kinetics increasing with annealing temperature. Gold thin films (7 nm) were deposited on planar and nanostructured polystyrene (PS) substrates and thermally annealed at 100 to 120 ∘C, near the polymer’s glass transition temperature (Tg,PS=100∘C). Homogeneous spin coated PS films and nanostructured PS lamellae, created via block copolymer self-assembly, served as substrates. Dewetting was characterized using SEM, AFM, and TEM. On planar PS, dewetting was observed at any temperature and proceeded without incubation time, triggered by the initial non-uniformity of the gold film. On nanostructured PS, gold formed nanorods aligned with the polymer lamellae, breaking into particles while preserving the substrate pattern. These findings demonstrate the role of substrate morphology and temperature in dewetting and suggest a route to fabricating sub-10 nm gold structures for applications in sensing, catalysis, and nanoelectronics using BCP-based polymer templates.
Keywords: Solid state dewetting; Block copolymers; in-situ TEM