Ammonia assisted growth of multiwalled carbon nanotubes
2009 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 246, no 11-12, 2440-2443 p.Article in journal (Refereed) Published
Bamboo structured nitrogen-containing carbon nanotubes are grown on e-beam deposited thin metal films (cobalt/iron) by chemical vapor deposition. The approach uses ammonia as supporting gas to form nano catalyst particles in the pretreatment phase. Ammonia is also used as nitrogen source. The effect of ammonia on the grown structures at different temperatures (720 and 810 °C) is investigated by SEM, TEM and Raman spectroscopy. We show that ammonia promotes growth of vertically aligned CNT carpets on thicker metal films (5 nm) than usually used. At the same time ammonia is inducing a high amount of defects but this effect changes significantly with temperature. At 720 °C defects are clearly ammonia induced while at 810 °C the defects seem to be induced by a different mechanism. Furthermore, the presence of ammonia in both pretreatment phase and growth phase reduces the outer diameter of the grown nanotubes.
Place, publisher, year, edition, pages
Wiley , 2009. Vol. 246, no 11-12, 2440-2443 p.
Carbon nanotubes, Chemical Vapor deposition, Raman spectroscopy
Condensed Matter Physics
Research subject Solid State Physics
IdentifiersURN: urn:nbn:se:umu:diva-29765DOI: 10.1002/pssb.200982260OAI: oai:DiVA.org:umu-29765DiVA: diva2:277994