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High subthreshold field-emission current due to hydrogen adsorption in single-walled carbon nanotubes: A first-principles study

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4 Author(s)
Yaghoobi, Parham ; Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada ; Alam, Md.Kawsar ; Walus, K. ; Nojeh, Alireza

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We investigate the effect of hydrogen adsorption on field-emission current from a single-walled carbon nanotube using first-principles calculations. The results show a new emission regime at field values around the field-emission threshold of bare nanotubes, with emission currents comparable to those of the high-field regime. This current enhancement can be explained with the surface dipole created as a result of the difference in electronegativity between carbon and hydrogen that contributes to electron extraction from the nanotube.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 26 )

Date of Publication:

Dec 2009

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