We report on the growth process of single wall carbon nanotubes from a catalyst free carbon source. The carbon for the growth process is provided from C60 fullerenes encapsulated into the cage of the tubes (peapods). The growth process is studied by Raman scattering at various stages for the transformation of the C60 peas to a new SWCNT inside the primary tube. The growth process was found to start for tubes with the smallest geometrically allowed diameters. At the same time the response from the C60 molecules started to disappear. Eventually the signal from the latter was gone while only the thin inner tubes have reached their final concentration. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]
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