Synthesis and characterization of single-walled nanotubes produced with Ce as catalyst
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 (Refereed)
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.
, Molecular Materials, ISSN 1058-7276 ; 13
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
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-23059OAI: oai:DiVA.org:umu-23059DiVA: diva2:219354