4 years ago

Au nanowire junction breakup through surface atom diffusion.

Sven Oras, Flyura Djurabekova, Vahur Zadin, Ekaterina Baibuz, Boris Polyakov, Sergei Vlassov, Ville Jansson, Simon Vigonski, Alvo Aabloo
Metallic nanowires are known to break into shorter fragments due to the Rayleigh instability mechanism. This process is strongly accelerated at elevated temperatures and can completely hinder the functioning of nanowire-based devices like e.g. transparent conductive and flexible coatings. At the same time, the arranged gold nanodots have important applications in electrochemical sensors. In this paper we perform series of heating experiments of gold nanowires and nanowire junctions. We show that nanowires are especially prone to fragmentation around junctions and crossing points even at comparatively low temperatures. We develop a gold parametrization for Kinetic Monte Carlo simulations and demonstrate the surface diffusion origin of the nanowire junction fragmentation. We show that nanowire fragmentation starts at the junctions with high reliability and propose that aligning nanowires in a regular grid could be used as a technique for fabricating arrays of nanodots.

Publisher URL: http://doi.org/10.1088/1361-6528/aa9a1b

DOI: 10.1088/1361-6528/aa9a1b

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