DOUBLE WALL CARBON NANOTUE AND METHOD FOR PREPARING SAME

摘要

PURPOSE: A double-walled carbon nanotube using a supported catalyst and a manufacturing method thereof are provided to have high purity and high selectivity of double-walled carbon nanotubes among synthesized carbon nanotubes and to reduce deformity and increase crystallinity. CONSTITUTION: A manufacturing method of double-walled carbon nanotubes comprises the following steps: preparing a supported catalyst; synthesizing carbon nanotubes by concurrently injecting hydrocarbon gas and hydrogen gas while increasing the temperature of a reactor up to 900-1000 deg. Celsius after charging the supported catalyst; and synthesizing carbon nanotubes by injecting hydrogen gas after decreasing reactor temperature to 200 deg. Celsius. The supported catalyst is manufactured by plasticizing a catalyst solution in which metallic catalysts and support elements are mixed in the reactor at 500-800 deg. Celsius. The ratio of support element (Mg): metallic catalyst (Co): molybdenum system activator (Mo) is 0 99: x: 0.025. Here, 0.05<=x<=0.075.