TY - JOUR
T1 - Preparation of aligned carbon nanotubes catalysed by laser-etched cobalt thin films
AU - Terrones, M.
AU - Grobert, N.
AU - Zhang, J. P.
AU - Terrones, H.
AU - Olivares, J.
AU - Hsu, W. K.
AU - Hare, J. P.
AU - Cheetham, A. K.
AU - Kroto, H. W.
AU - Walton, D. R.M.
N1 - Funding Information:
We thank K. Kordatos for the supply of 2-amino-4,6-dichloro-s-triazine. We are grateful to R. Guardián, R. Hernández, P. Mexia, K. Prassides, D.P. Randall, L. Rendón, S. Tehuacanero, J. Thorpe, and P.D. Townsend for useful discussions and for providing Electron Microscope facilities. We thank the Royal Society (London), BOC gases, the DERA (NG), CONACYT-México (HT), DGAPA-UNAM IN 107-296 (HT), EU-TMR grant (JO) and the EPSRC for financial support.
PY - 1998/3/27
Y1 - 1998/3/27
N2 - Pyrolysis of 2-amino-4,6-dichloro-s-triazine over laser-etched thin films of cobalt deposited on an inverted silica substrate generates aligned bundles and films of carbon nanotubes of uniform dimensions. Scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray analyses, electron energy loss spectroscopy and electron diffraction studies reveal that the aligned tubes, which usually grow perpendicular to the substrate surface, are mainly straight (length ≤100 μm; 30-50 nm OD), contain traces of nitrogen (<5%) and exhibit a preferred helicity (e.g. armchair 25-30%). Other graphitic structures (e.g. polyhedral particles, encapsulated particles and amorphous carbon) are absent. Energised cobalt clusters/particles (≤50 nm), ablated during laser-etching, may condense and recrystallise evenly on the surface of the substrate as cobalt and/or cobalt oxide. These crystals apparently play a key role in nanotube production.
AB - Pyrolysis of 2-amino-4,6-dichloro-s-triazine over laser-etched thin films of cobalt deposited on an inverted silica substrate generates aligned bundles and films of carbon nanotubes of uniform dimensions. Scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray analyses, electron energy loss spectroscopy and electron diffraction studies reveal that the aligned tubes, which usually grow perpendicular to the substrate surface, are mainly straight (length ≤100 μm; 30-50 nm OD), contain traces of nitrogen (<5%) and exhibit a preferred helicity (e.g. armchair 25-30%). Other graphitic structures (e.g. polyhedral particles, encapsulated particles and amorphous carbon) are absent. Energised cobalt clusters/particles (≤50 nm), ablated during laser-etching, may condense and recrystallise evenly on the surface of the substrate as cobalt and/or cobalt oxide. These crystals apparently play a key role in nanotube production.
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U2 - 10.1016/S0009-2614(98)00093-1
DO - 10.1016/S0009-2614(98)00093-1
M3 - Article
AN - SCOPUS:0000084620
VL - 285
SP - 299
EP - 305
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 5-6
ER -