SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.25: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

Importance of symmetry for the collapse of nanowire arrays — •Malte Grunert, Chengzhang Yhang, Huaping Zhao, and Yong Lei — Technische Universität Ilmenau

We present numerical results highlighting the importance of symmetry considerations in the capillary collapse of nanowire arrays. For many of the envisaged applications of nanowire arrays, for example as a novel electrode material in lithium-ion batteries [1], maximizing the aspect ratio of the individual nanowires is one of the main goals. However, collapse occurs for wet-chemical fabrication processes after a critical aspect ratio is exceeded. As the length of the nanowires is increased, the torque resulting from surface tension during the drying step is increased as well, leading to collapse. In literature, only systems consisting of few nanowires are considered [2]. We show using multiphysics FEM simulations that a perfectly symmetric periodic nanowire array does not collapse, as the forces acting on the nanowires exactly cancel out. However, we also show that even slight length variations below the currently achievable experimental precision suffice to break the symmetry enough to load to the collapse of the entire array.

[1] L. Liang, Y. Xu, C. Wang, L. Wen, Y. Fang, Y. Mi, M. Zhou, H. Zhao, and Y. Lei, Large-scale highly ordered Sb nanorod array anodes with high capacity and rate capability for sodium-ion batteries, Energy & Environmental Science, 8, (2015).

[2] D. Chandra and S. Yang, Stability of high-aspect-ratio micropillar arrays against adhesive and capillary forces, Accounts of Chemical Research, 43, (2010)