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Synthesis and characterization of single-walled nanotubes produced with Ce as catalyst
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
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2000 (English)In: Molecular Materials: Molecular Crystals and Liquid Crystals Section C, vol. 13: Proceedings of the 4th International Workshop on Fullerenes and Atomic Clusters (IWFAC'99), St. Petersburg 1999, Overseas Publishers Association N.V. , 2000, 75-80 p.Conference paper, Published paper (Refereed)
Abstract [en]

We have studied the effect of using rare-earth elements C (typically +4 oxide state) and Eu (typically +2 oxide state) together with nanometer Ni as catalysts to synthesize SWNT in high yield by arc evaporation. A black collar deposit containing mainly SWNT was formed in the presence of Ce/Ni while only nanometer carbon particles were formed using Eu/Ni, as identified by SEM, TEM and Raman spectra. The Raman spectra of our SWNT mats show difference from spectra shown in the literature in a low frequency range, indicating that our mats contain chiral tubes. The temperature dependent resistance of SWNT mats was also measured. A semiconducting behaviour was observed with a negative dR/dT and no resistance minimum from 2 to 350 K. The resistance follows a 2D variable range hopping behaviour.

Place, publisher, year, edition, pages
Overseas Publishers Association N.V. , 2000. 75-80 p.
Series
Molecular Materials, ISSN 1058-7276 ; 13
Keyword [en]
Carbon nanotubes, single-walled carbon nanotubes, SWNT, synthesis, arc method, Raman spectroscopy, TEM, transmission electron microscopy, SEM, scanning electron microscopy, resistance, 2D variable range hopping model
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-23059OAI: oai:DiVA.org:umu-23059DiVA: diva2:219354
Available from: 2009-05-27 Created: 2009-05-27 Last updated: 2010-01-22

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Wågberg, ThomasMakarova, Tatiana L.Sundqvist, Bertil

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