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H. SHINOHARA,P. RAMESH,K. SATO,Y. OZEKI,N. KISHI,T. SUGAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.1
Experimental conditions that govern the double-wall carbon nanotube (DWNT) growth during alcohol catalytic chemical vapor deposition (CCVD) have been optimized for mesoporous silica (MCM41) support materials. Catalyst pretreatment and preparation methods influence the quality of as-grown carbon nanotubes (CNTs). Catalyst pretreatment at low pressure leads to high-quality CNTs concomitant with an increase in the DWNT yield. Impregnation of metal precursors using methanol as the solvent is found to be more suitable than the aqueous solution. Influence of the precursor anion/metal ion on the DWNT yield is also studied under these optimized conditions. Thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and Raman spectroscopic methods have been employed to estimate the quality of the CNTs. It is observed that the present optimized method yields high-quality DWNTs with low amounts of side-wall defects and other carbon impurities.