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Issue 9, 2019
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Tuning bimetallic catalysts for a selective growth of SWCNTs

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Abstract

Recent advances in structural control during the synthesis of SWCNTs have in common the use of bimetallic nanoparticles as catalysts, despite the fact that their exact role is not fully understood. We therefore analyze the effect of the catalyst's chemical composition on the structure of the resulting SWCNTs by comparing three bimetallic catalysts (FeRu, CoRu and NiRu). A specific synthesis protocol is designed to impede the catalyst nanoparticle coalescence mechanisms and stabilize their diameter distributions throughout the growth. Owing to the ruthenium component which has a limited carbon solubility, tubes grow in tangential mode and their diameter is close to that of their seeding nanoparticles. By using the as-synthesized SWCNTs as a channel material infield effect transistors, we show how the chemical composition of the catalysts and temperature can be used as parameters to tune the diameter distribution and semiconducting-to-metallic ratio of SWCNT samples. Finally, a phenomenological model, based on the dependence of the carbon solubility as a function of catalyst nanoparticle size and nature of the alloying elements, is proposed to interpret the results.

Graphical abstract: Tuning bimetallic catalysts for a selective growth of SWCNTs

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Publication details

The article was received on 27 Nov 2018, accepted on 29 Jan 2019 and first published on 06 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR09589B
Nanoscale, 2019,11, 4091-4100

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    Tuning bimetallic catalysts for a selective growth of SWCNTs

    S. Forel, A. Castan, H. Amara, I. Florea, F. Fossard, L. Catala, C. Bichara, T. Mallah, V. Huc, A. Loiseau and C. Cojocaru, Nanoscale, 2019, 11, 4091
    DOI: 10.1039/C8NR09589B

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