Synthesis of multiwalled carbon nanotubes by high-temperature vacuum annealing of amorphous carbon |
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Authors: | S Seelan |
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Affiliation: | Department of Chemistry, Institute of Atomic and Molecular Sciences, National Taiwan University, Academia Sinica, P.O. Box 23-34, Taipei, Taiwan, Republic of China |
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Abstract: | Vacuum annealing of a mixture of amorphous carbon and cobalt nanoparticles supported on microporous zeolite at high-temperature results in the formation of multiwalled carbon nanotubes which are essentially filled with metal nanoparticles or nanowires as observed by transmission electron microscopy. The electronic properties of nanotubes by variable temperature ESR techniques shows that g values show little change with temperature from 77 to 327 K but the line width (ΔHpp) of the ESR signal for nanotubes synthesized from amorphous carbon increases from 7.9 G at 77 K to 9.5 G at 327 K. |
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Keywords: | Carbon nanotube ESR Vacuum annealing Zeolite |
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