Cold wall CVD generation of single-walled carbon nanotubes and in situ Raman scattering measurements of the growth stage

Catalytic CVD generation of high-purity single-walled carbon nanotubes (SWNTs) without use of an electric furnace or a hot-filament is demonstrated. High-purity SWNTs were generated from alcohol used as a carbon source with Fe/Co particles supported on zeolite by Joule heating of a silicon base plate. This technique was applied for an in situ measurement of Raman scattering during the growth stage in a vacuum chamber equipped with an SPM/Raman detector. The surface temperature was measured by a systematic shift in the silicon signal and kept at 850 °C. The G-band intensity of the SWNT Raman spectrum increased nearly linearly with time in the growth stage after an initial rapid increase.