Carbon nanotube was synthesized by decomposition of ethylene over oxidized diamond-supported catalysts at a relatively mild temperature. We focused inner structure of carbon nanotubes which were synthesized using Ni-Fe, Co-Fe, and Ni-Co loaded oxidized diamond catalysts. In these catalysts of Ni-Fe, Co-Fe, and Ni-Co-loaded oxidized diamond catalysts, oxidation state of loaded metals were compound oxide of NiFe 2 O 4 , CoFe 2 O 4 , and NiCo 2 O 4 , respectively. The oxidation state of loaded-bimetallic species might have played an important role in clear internal structure of synthesized carbon nanotube.

Carbon nanotubes (CNTs) and nanofilaments (CNFs) were synthesized by the decomposition of ethylene using oxidized diamond-supported catalysts at a relatively mild temperature. Oxidized diamond is proposed as a novel support material for the catalytic synthesis of CNTs and CNFs. We focused on the inner structure of the CNTs which were synthesized using Ni, Co, Fe, Ni-Fe, Co-Fe, and Ni-Co-loaded oxidized diamond catalysts. The oxidation state of loaded metals in bimetallic catalysts played an important role in producing a more uniform internal structure of the synthesized CNTs. CNFs synthesized over bimetal-loaded oxidized diamond catalysts had different internal structures and fiber axis/graphene layer angles.

Carbon nanotube and filament could be obtained by the decomposition of C2H4 using oxidized diamond-supported metal catalysts with three distinct structural types. Oxidized diamond is proposed as a novel catalytic means for the synthesis of nanocarbons. Oxidized diamond may catalyze unique reactions of importance in carbon nanotube and filament synthesis.

Carbon nanotubes (CNTs) and carbon nanofilaments (CNFs) have attracted considerable interest in industry and many other fields such as for their use in electronic devices. In this study, CNFs were synthesized by decomposition of ethylene over Pd-and Ni-loaded oxidized diamond catalysts using a fluidized-bed reactor. We examined the effects of various internal structures on Li-ion battery anode properties. Electrochemical measurements indicated that CNF anodes displayed near the theoretical discharge capacity of graphite intercalation compounds (372 mAh/g) as well as high cycle retention. CNF anodes were thus found to be appropriate materials for the use in Li-ion batteries.

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