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In situ insight on the unconventional Ruthenium catalyzed growth of carbon nanostructures

Abstract

We report on the in-situ analysis of the growth process of carbon nanostructures catalyzed by Ru nanoparticles using syngas, a mix of hydrogen and CO, as a carbon source at medium temperature (500°C). The structural modifications of the dual nanotube/nanoparticle system and the dynamics of the involved processes have been directly recorded in real time and at the atomic scale, during the growing process using transmission electron microscopy in an environmental gas cell at atmospheric pressure. After a reduction step under hydrogen, the particles became very active for the carbon nanotube growth when exposed to syngas. The growth rate is independent on the particle size which mainly influences the nanotube wall thickness. Other subtle information on the behavior of the system have been obtained, as for instance the fact that the regular changes in the direction of the particle do originate from particle shape fluctuations. The main result is the evidence of a new growth mode in relation with the presence and the high instability of the ruthenium carbide phase which acts as a carbon reservoir. For the first time, a relaxation oscillation of the growth rate has been observed and correlated to the metal-carbide transition at the particle sub-surface.

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Publication details

The article was received on 09 Feb 2018, accepted on 05 Jul 2018 and first published on 06 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR01227J
Citation: Nanoscale, 2018, Accepted Manuscript
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    In situ insight on the unconventional Ruthenium catalyzed growth of carbon nanostructures

    M. Bahri, K. Dembélé, C. Sassoye, D. P. Debecker, S. Moldovan, A. gay, C. Hirlimann, C. Sanchez and O. Ersen, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01227J

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