Preparation of Fullerenes by Resistive Heating Vaporization Method --Effect of Carbon Materials

摘要

Effects of carbon materials on weight yields of (C_(60)+C_(70)) and weight ratios of C_(60) to (C_(60) + C_(70)) in soot were examined by the Joule resistive heating of four kinds of carbon materials at He gas pressures from 0.7 X 10~4 to 8.0 X 10~4 Pa for collector radii of 45, 50 and 55 mm. The yields were in the range of 1 to 8 percent for graphite with hexagonal lattice, and better than those for glassy carbon. The most effective He gas pressures for the fullerene yields were in the range of 4.0 to 5.3 X 10~4 Pa. Any collector radii dependence of the yields was not observed. The weight ratios of C_(60) to (C_(60) + C_(70)) were about 60 to 70 percent, and showed neither He gas pressure dependence nor collector radii dependence for four kinds of carbon materials.