Effect of length and spacing of vertically aligned carbon nanotubes on field emission properties

Jo, S. H.; Tu, Y.; Huang, Z. P.; Carnahan, D. L.; Wang, D. Z.; Ren, Z. F.
May 2003
Applied Physics Letters;5/19/2003, Vol. 82 Issue 20, p3520
Academic Journal
The length and the spacing of carbon nanotube (CNT) films are varied independently to investigate their effect on the field-emission characteristics of the vertically aligned CNT films grown by plasma-enhanced hot filament chemical vapor deposition using pulsed-current electrochemically deposited catalyst particles. It is shown that, in general, the macroscopic electric field E[sub mac, l], defined as the electric field when the emission current density reaches 1 mA/cm², can be reduced by increasing the length and the spacing of CNTs. However, for the very-high-density CNT films, the increase of length increases E[sub mac, 1] slightly, whereas for the very short CNT films, the increase of spacing does not effectively reduce E[sub mac, 1].


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