Résumé
We discuss here the influence of some synthesis parameters in the production of single wall carbon nanotubes (SWNT) with a 2 kW solar furnace at the Odeillo Institute. We first study the specific role of catalysts like nickel or cobalt on the SWNT formation process. SEM and TEM pictures shaw significant differences in the yield of production and suggest different growth mechanisms. Furthermore, we report Raman spectra for samples produced using lanthanium or sulfur as catalysts. These samples provide very striking results in the low frequency range (in term of distribution in diameter) with a good correlation with the graphite-like modes region.