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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.10: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Argon ion induced nanostructuring on Titanium surfaces — •Jens Bauer, Hannaneh Hosseini, Gregor Dornberg, Frank Frost, and Andriy Lotnyk — Leibniz-Institut für Oberflächenmodifizierung, Permoserstraße 15, D-04318 Leipzig, Germany

A flexible processing tool to fabricate different kinds of nanostructured surfaces in form of ordered fields of nano-dot or nano-ripple structures is ion-beam erosion by low-energetic ions. A broadband argon ion beam at 1.5 keV is used to investigate the nanostructure formation on polished, polycrystalline cp-Ti samples. The morphology is analyzed by white light interferometry (WLI), atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electron back-scatter diffraction (EBSD) experiments are performed to analyze the local crystal structure. Under normal ion incidence conditions the ripple morphology is found to be correlated to the crystallographic orientation of the titanium grain structure. Ordered nano-ripples with saw-tooth cross-section are formed with a structure period of 20 – 350 nm and a height of 4 – 50 nm. At low structure periods < 25 nm the ripple morphology tends to unclench resulting in chains of ordered nano-dot arrays. The structure evolution is investigated in the fluence range of 0.3 – 2.0 x 10¹⁹ 1/cm². The ripple formation on Ti is observed to be time independent indicating a convergent structuring process at normal ion incidence.

Keywords: Nanostructure; Ripples; Ion Beam Processing; Titanium; Self-organization