Gas phase synthesis of non-bundled, small diameter single-walled carbon nanotubes with near-armchair chiralities

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Mustonen, K.
dc.contributor.author Laiho, P.
dc.contributor.author Kaskela, A.
dc.contributor.author Zhu, Z.
dc.contributor.author Reynaud, O.
dc.contributor.author Houbenov, N.
dc.contributor.author Tian, Y.
dc.contributor.author Susi, Toma
dc.contributor.author Jiang, H.
dc.contributor.author Nasibulin, Albert G.
dc.contributor.author Kauppinen, Esko I.
dc.date.accessioned 2015-10-28T10:01:37Z
dc.date.available 2015-10-28T10:01:37Z
dc.date.issued 2015
dc.identifier.citation Mustonen, K. & Laiho, P. & Kaskela, A. & Zhu, Z. & Reynaud, O. & Houbenov, N. & Tian, Y. & Susi, T. & Jiang, H. & Nasibulin, A. G. & Kauppinen, Esko I. 2015. Gas phase synthesis of non-bundled, small diameter single-walled carbon nanotubes with near-armchair chiralities. Applied Physics Letters. Volume 107, Issue 1. 013106/1-5. ISSN 0003-6951 (printed). DOI: 10.1063/1.4926415 en
dc.identifier.issn 0003-6951 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/18217
dc.description.abstract We present a floating catalyst synthesis route for individual, i.e., non-bundled, small diameter single-walled carbon nanotubes (SWCNTs) with a narrow chiral angle distribution peaking at high chiralities near the armchair species. An ex situ spark discharge generator was used to form iron particles with geometric number mean diameters of 3–4 nm and fed into a laminar flow chemical vapour deposition reactor for the continuous synthesis of long and high-quality SWCNTs from ambient pressure carbon monoxide. The intensity ratio of G/D peaks in Raman spectra up to 48 and mean tube lengths up to 4 μm were observed. The chiral distributions, as directly determined by electron diffraction in the transmission electron microscope, clustered around the (n,m) indices (7,6), (8,6), (8,7), and (9,6), with up to 70% of tubes having chiral angles over 20°. The mean diameter of SWCNTs was reduced from 1.10 to 1.04 nm by decreasing the growth temperature from 880 to 750 °C, which simultaneously increased the fraction of semiconducting tubes from 67% to 80%. Limiting the nanotube gas phase number concentration to ∼10 exp 5 cm exp −3 prevented nanotube bundle formation that is due to collisions induced by Brownian diffusion. Up to 80% of 500 as-deposited tubes observed by atomic force and transmission electron microscopy were individual. Transparent conducting films deposited from these SWCNTs exhibited record low sheet resistances of 63 Ω/□ at 90% transparency for 550 nm light. en
dc.format.extent 013106/1-5
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher AIP Publishing en
dc.relation.ispartofseries Applied Physics Letters en
dc.relation.ispartofseries Volume 107, Issue 1
dc.rights © 2015 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in Applied Physics Letters, Volume 107, Issue 1 and may be found at http://scitation.aip.org/content/aip/journal/apl/107/1/10.1063/1.4926415. en
dc.subject.other Physics en
dc.title Gas phase synthesis of non-bundled, small diameter single-walled carbon nanotubes with near-armchair chiralities en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder AIP Publishing
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword carbon nanotubes en
dc.subject.keyword chiral symmetries en
dc.subject.keyword chemical vapor deposition en
dc.subject.keyword synthesis en
dc.identifier.urn URN:NBN:fi:aalto-201510284787
dc.type.dcmitype text en
dc.identifier.doi 10.1063/1.4926415
dc.type.version Final published version en


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