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Multiwall carbon nanotubes (CNTs) were synthesized by the annealing of carbonaceous solid at a low-temperature (450°C). The average diameter of the CNTs is about 50nm. The length of the CNTs ranges from 200nm to nearly 1μm. The as-synthesized CNTs are crystallized. Cobalt nanoparticle is capped at the tip of the CNT. The carbonaceous solid, which contains cobalt nanoparticles, was obtained by the...
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