Using Fe as a catalyst,carbon nanotubes(CNTs) were synthesized on silicon by radio-frequency plasma enhanced chemical vapor deposition(RF-PECVD).The morphology and microstructure of CNTs were characterized by scanning electron microscope(SEM),transmission electron microscopy(TEM) and Raman spectroscope,respectively.The results show that the orientation of carbon nanotubes synthesized under 700 ℃ and 800 ℃ is disordered and bending tangled.The neatly arranged cylindrical-shaped graphite sheets co...