Journal
ACS NANO
Volume 3, Issue 9, Pages 2617-2622Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn900674e
Keywords
carbon nanotube; onset field; field emission; plasma-sharpened tip; square hill potential barrier
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Nanostructures based on multiwalled carbon nanotubes (MWNTs) are fabricated using plasma of the mixture of hydrogen and nitrogen gases. The plasma-sharpened tips of nanotubes contain only a few tubes at the apex of the structure and lead to the dramatic enhancement in the emission current density by a factor >10(6) with the onset field as low as 0.16 V/mu m. We propose that the nature of the tunneling barrier changes significantly for a nanosize tip at very high local electric field and may lead to the saturation in the emission current density.
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