Page 64 - Carbon Nanotubes
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54 C.-H. KIANG et a/.
18 nm
Fig. 3b. Large-diameter tubes produced with Co and S present; the tubes shown have approximate di-
ameters of 5.7, 3.1, and 2.6 nm.
tubes. Figure 4 is a high-resolution image of some capsulated in graphitic polyhedra constitute about 30%
encapsulated Co particles, which have structures rem- of the total Co-containing particles. The role of sul-
iniscent of those observed for Lac2 and YC2 particles fur in the formation of these filled polyhedra is not
found in cathode deposits[16,48-501. Crystallites en- clear. Sulfur is known to assist the graphitization of
