Carbon fiber composite single carbon nano tube and its preparing method

The composite carbon nanotube consists of carbon nanotube, conic carbon fiber and base, and features the carbon nanotube growing vertically on the base and coated inside the conic carbon fiber, and the conic carbon fiber with stretched tip. The preparation process of the composite carbon nanotube includes the following steps: cleaning the base, attaching transition metal catalyst onto the base, setting the base inside one heating equipment capable of being vacuumized and using the base as one electrode contacting to one other electrode, vacuumizing the heating equipment and introducing mixed gas of reductant gas and carbon source gas slowly, applying current across the electrodes after the heating equipment reaches certain pressure to raise the temperature of the base to 1600-2400 deg.c for 30-120 sec before cutting off the power source, and introducing reductant gas to cool the base.