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The single-walled carbon nanotubes (SWNTs) synthesized by a catalytic decomposition of alcohol (Alcohol CVD method, ACCVD) are compared with HiPco SWNTs sample through optical spectroscopic measurements such as resonant Raman scattering, optical absorption and near infrared fluorescence. By ACCVD method, SWNTs were synthesized either on zeolite catalyst-support particles or directly on the surface of quartz substrate, where the latter case a simple dip-coat technique was employed for mounting the metal catalyst. In specific, morphological characteristics of as-grown SWNTs generated on zeolite support are presented using SEM and TEM revealing that the SWNTs produced by the proposed method possesses significant quality that is almost free from amorphous carbons or metal particle impurities. The quality and diameter distribution of SWNTs were investigated and discussed through the results of Raman scattering and optical absorption. The average diameter of SWNTs was slightly smaller for SWNTs grown on zeolite particles compared with HiPco SWNTs. Finally, fluorescent emission spectra from isolated SWNTs in aqueous surfactant suspension were measured for variable excitation wavelength to determine the structural (n, m) distribution of SWNTs. The narrower chirality distribution was demonstrated for ACCVD SWNTs grown on zeolite compared with HiPco SWNTs.

Optical characterization of single-walled carbon nanotubes synthesized by catalytic decomposition of alcohol