Abstract
Individual multiwalled carbon nanotube (CNT) emitters were fabricated on a Si substrate by electron-beam lithography. The CNT emitter had seven anodes with orientation θ ranging from 0–60° with respect to the CNT axis. Field-emission experiments revealed that the emission current I was largest along the θ= 0° direction and decreased monotonically with increasing θ; at θ= 56° I decreased to one-thirtieth of its value at 0°. The emission surface area also decreased by four orders of magnitude as θ increased from 0 to 56°. In contrast, the field enhancement factor increased by a factor of five in the same angular range. It was found that 80% of the emission current was contained within 20° from the CNT axis. The results indicate that a CNT emits electrons most effectively along its CNT axis.
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
