Self-organized carbon connections between catalyst particles on a silicon surface exposed to atmospheric-pressure Ar + CH4 microplasmas

I. Levchenko, K. Ostrikov, D Mariotti, V. Svrcek

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Ag nanoparticles and Fe-coated Si micrograins were separately deposited onto Si(1 0 0) surfaces and then exposed to an Ar + CH4 microplasma at atmospheric pressure. For the Ag nanoparticles, self-organized carbon nanowires, up to 400 nm in length were produced, whereas for the Fe-coated Si micrograins carbon connections with the length up to 100mu m were synthesized on the plasma-exposed surface area of about 0.5 mm(2). The experiment has revealed that long carbon connections and short nanowires demonstrate quite similar behavior and structure. While most connections/nanowires tended to link the nearest particles, some wires were found to `dissolve' into the substrate without terminatingat the second particle. Both connections and nanowires are mostly linear, but long carbon connections can form kinks which were not observed in the carbon nanowire networks. A growth scenario explaining the carbon structure nucleation and growth is proposed. Multiscale numerical simulations reveal that the electric field pattern around the growing connections/nanowires strongly affects the surface diffusion of carbon adatoms, the main driving force for the observed self-organization in the system. The results suggest that themicroplasma-generated surface charges can be. used as effective controls for the self-organized formation of complex carbon-based nano-networks for integrated nanodevices. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)2379-2390
JournalCarbon
Volume47
Issue number10
Early online date4 May 2009
DOIs
Publication statusPublished - 1 Aug 2009

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