Abstract
Among platinum-group elements, Ru is one of the most inexpensive metals, while its melting point (2334°C) is very high. In this study, we carried out single-walled carbon nanotube (SWCNT) growth by an alcohol catalytic chemical vapor deposition (CVD) in a high vacuum using Ru catalysts. By optimizing the ethanol pressure, we could grow SWCNTs below 700°C, and succeeded in growth at 500°C from Ru catalysts, for the first time. Raman measurements showed that, compared to the growth at 700°C, the SWCNTs grown at 500°C had smaller diameters (<1.26nm) and narrow diameter distribution. In addition, the diameters were smaller than those from the conventional catalysts for SWCNT growth, Fe. TEM observation showed that, due to the high-melting-point, the aggregation of Ru catalysts was suppressed and that the smaller catalyst particles were formed, resulting in the small-diameter SWCNTs.
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