Abstract
Carbon nanotubes have been synthesized by a LPCVD on nanocrystalline Fe–Pd film. CNTs are grown for 30 min and 1 h respectively. From the SEM images, the diameter of these nanotubes varies from 40– 80 nm and the length is several micro-meter approximately. TEM observations suggest that the CNTs are multi-walled and the structure changes from ordinary geometry of CNTs to bamboo shaped. We have observed sharp G and D bands in the Raman spectra of these carbon nanotubes. Higher D-band is observed for the carbon nanotubes grown for longer time (1 h), showing that these nanotubes contain more amorphous carbon. The field emission measurements for these CNTs are also performed. For CNTs grown for longer time (1 h), a superior turn-on field of 4.88 V / μ m (when the current density achieves 10 μ A / cm 2 ) is obtained and a current density of 29.36 mA / cm 2 can be generated at 9.59 V / μ m .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
