High purity single-walled carbon nanotubes (SWNTs) were synthesized from ethanol by catalytic CVD method. The yield of SWNTs was determined based on TGA complemented by Raman and TEM analyses. The effects of CVD reaction time and pre-reduction of catalytic metal on the yield and quality of synthesized SWNTs were investigated. The SWNT yield of more than 40% was achieved over the weight of zeolite support powder with Fe/Co catalyst, which corresponded to more than 800% yield over the weight of the catalytic metal, within the CVD reaction time of 120 min assuring as-grown high quality. (C) 2003 Elsevier Science B.V. All rights reserved.