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.

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