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

Yaghoobi, Parham; Alam, Md. Kawsar; Walus, Konrad; Nojeh, Alireza
December 2009
Applied Physics Letters;12/28/2009, Vol. 95 Issue 26, p262102
Academic Journal
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.


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