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A Density Functional Theory Study on the Effects of Gas Adsorbates on the Field Emission of Single Wall Carbon Nanotubes

Brahim Akdim*, a, Xiaofeng Duanb, and Ruth Pachtera

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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