Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster II

CPP 46.47: Poster

Donnerstag, 12. März 2026, 09:30–11:30, P5

Exploring the length limit for freestanding electrodeposited Ni nanowires — •Anneliese Wirth and Karin Leistner — Chemnitz University of Technology, Chemnitz 09107, Germany

Magnetic nanowire arrays are of interest from a fundamental and application point of view due to the shape anisotropy and high surface-to-volume ratio. This can be advantageous for 3D memory devices, micro-hard magnets and catalysis. The goal of this project is to obtain freestanding Ni nanowire arrays in order to functionalize their surface and possibly apply electrolytic gating strategies for 3D magneto-ionic materials in the future.^[1] The Ni nanowire synthesis is performed by electrodepositing Ni into aluminum oxide membranes that serve as templates. Afterwards, the template is removed via dissolution of the aluminum oxide to achieve freestanding nanowires. For nanowires with high aspect ratio, this step usually leads to the collapse of the wires into agglomerated bundles.^[2] This causes the loss of the nanowires’ perpendicular alignment to the substrate. We show an optimized synthesis that avoids the collapse of nanowires with high aspect ratio in a large-scale array with a total size of around 0.5 cm². The deposition time during the electrodeposition is varied to obtain nanowires reaching up to more than 10 µm length while the diameter is fixed to 200 nm. Scanning electron microscopy indicates that the freestanding nature is related to irregularities of the nanowires which are introduced by the specific template geometry and lead to the stabilization of the array. ^[1] M. Nichterwitz et. al, ACS Mater. Au 2024, 4, 55. ^[2] N. Winkler et. al, J. Mater. Chem. 2012, 22, 16627.

Keywords: Ni nanowires; nanowire array; magnetic nanostructure