Heat-induced morphological changes in silver nanowires deposited on a patterned silicon substrate

Submitting author affiliation:
Institute of Physics, University of Tartu, Tartu, Estonia

Beilstein Arch. 2024, 20244. https://doi.org/10.3762/bxiv.2024.4.v1

Published 24 Jan 2024

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Abstract

Metallic nanowires (NWs) are sensitive to heat treatment and can split into shorter fragments within minutes at temperatures far below the melting point. This process can hinder the functioning of NW-based devices that are subject even to relatively mild temperatures. Commonly, heat-induced fragmentation of NWs is attributed to the interplay between heat-enhanced diffusion and Rayleigh instability. In this work we demonstrated that contact with the substrate plays an important role in the fragmentation process and can strongly affect the outcome of the heat treatment. We deposited silver NWs onto specially patterned silicon wafers so that some NWs were partially suspended over the holes in the substrate. Then we performed a series of heat-treatment experiments and found that adhered and suspended parts of NWs behave differently under the heat-treatment. Moreover, depending on the heat-treatment process, fragmentation in either adhered or suspended parts can dominate. Experiments were supported by finite element method and molecular dynamics simulations.

Keywords: silver nanowires, heat treatment, melting, morphological changes, diffusion.

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When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Damerchi, E.; Oras, S.; Butanovs, E.; Liivlaid, A.; Antsov, M.; Polyakov, B.; Trausa, A.; Zadin, V.; Kyritsakis, A.; Vidal, L.; Mougin, K.; Pikker, S.; Vlassov, S. Beilstein Arch. 2024, 20244. doi:10.3762/bxiv.2024.4.v1

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