A Density Functional Theory Study on the Effects of Gas Adsorbates on the Field Emission of Single Wall Carbon Nanotubes
aMaterials & Manufacturing Directorate, AFRL/MLPJ,
WPAFB, OH 45433-7702 USA
bAFRL/ASC
This is an abstract
for a presentation given at the
10th
Foresight Conference on Molecular Nanotechnology
The effects of gas adsorbates on the field emission of carbon nanotube arrays have been observed and studied experimentally (Lim et al. Adv. Mat. 2001). In order to gain an understanding of these effects at the molecular level, we performed a density functional theory study on the adsorption of N2, O2, H2, and H2O at capped and open-end tips of single wall carbon nanotubes. The current suppression at high voltage observed in many I-V experiments, which is causing the emission to deviate from Fowler-Nordheim curve, will be discussed in light of our results.
*Corresponding Address:
Brahim Akdim
Materials & Manufacturing Directorate, AFRL/MLPJ
3005 P Street, WPAFB, OH 45433-7702 USA
Phone: (937)255-3808 x 3108 Fax: (937)255-3377
Email: brahim.akdim@wpafb.af.mil
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