The optimal growth condition for directly anchored carbon nanotube on
carbon fiber was pre-treatment time with H2 (200 sccm) for 20 min and followed by 5 min growth time at
550 °C using a gas mixture of C2H2 (10 sccm), H2 (150 sccm), Ar (500 sccm) and N2 (50 sccm) under
atmospheric pressure.