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Crystallographic Order in Multi‐Walled Carbon Nanotubes Synthesized in the Presence of Nitrogen
Author(s) -
Ducati Caterina,
Koziol Krzystof,
Friedrichs Steffi,
Yates Timothy J. V.,
Shaffer Milo S.,
Midgley Paul A.,
Windle Alan H.
Publication year - 2006
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200500513
Subject(s) - carbon nanotube , materials science , chirality (physics) , diazine , ferrocene , nanotube , chemical engineering , nitrogen , toluene , nanotechnology , chemical vapor deposition , carbon nanotube supported catalyst , catalysis , carbon nanofiber , organic chemistry , chemistry , electrochemistry , chiral symmetry breaking , physics , electrode , quantum mechanics , nambu–jona lasinio model , engineering , quark
Multi‐walled carbon nanotubes were synthesized by chemical vapor deposition from pure toluene and toluene/diazine mixtures using ferrocene as a catalyst precursor at 760 °C. As recently announced, [1] characterization of the resulting nanotube films showed that, unlike pure carbon nanotubes, those grown in the presence of nitrogen have an extremely high degree of internal order, both in terms of the uniform chirality in the nanotube walls and of the crystallographic register between them. Here, the structure, defects, and morphology of the nanotubes were analyzed in depth using advanced electron microscopy techniques, and compared with existing models and observations. Nitrogen, which seems to be responsible for the dramatic structural order, was found to segregate preferentially within the core of the nanotubes.