Chiral-selective growth of single-walled carbon nanotubes on stainless steel wires |
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| Authors: | Maoshuai He Pavel V. Fedotov Elena D. Obraztsova Ville Viitanen Jani Sainio Hua Jiang Esko I. Kauppinen Marita Niemelä Juha Lehtonen |
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| Affiliation: | 1. Department of Biotechnology and Chemical Technology, School of Chemical Technology, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland;2. A.M. Prokhorov General Physics Institute RAS, 38 Vavilov Street, 119991 Moscow, Russia;3. Department of Applied Physics, School of Science, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland;4. Department of Applied Physics and Center for New Materials, School of Science, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland |
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| Abstract: | Single-walled carbon nanotubes (SWCNTs) were successfully grown on calcined stainless steel wires at 700 °C using CO as the carbon source. By contrast, the raw stainless steel wires produced only necklace-like multi-walled carbon nanotubes. Photoluminescence spectroscopy studies showed that SWCNTs grown from calcined stainless steel have a narrow diameter distribution and a high chiral selectivity of (6,5) nanotubes. The pre-growth heat treatment of the stainless steel leads to formation of iron and chromium oxides. The reduction of iron oxide results in formation of Fe nanoparticles which, anchored by chromium oxide, account for the chiral-selective growth of SWCNTs. |
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