Synthesis of Nickel-Encapsulated Carbon Nanocapsules and Cup-Stacked-Type Carbon Nanotubes via Nickel-Doped Fullerene Nanowhiskers

摘要

Nickel- (Ni) doped C_(60) nanowhiskers (NWs) were synthesized by a liquid-liquid interfacial precipitation method using a C_(60)-saturated toluene solution and isopropanol with Ni nitrate hexahydrate Ni(NO_3)_2·6H_2O. By varying the heating temperature of Ni-doped C_(60) NWs, two types of one-dimensional carbon nanostructures were produced. By heating the NWs at 973 and 1173 K, carbon nanocapsules (CNCs) that encapsulated Ni nanoparticles were produced. The Ni-encapsulated CNCs joined one dimensionally to form chain structures. Upon heating the NWs to 1373 K, cup-stacked-type carbon nanotubes were synthesized.