Dramatic Enhancement of the Emission Current Density from Carbon Nanotube Based Nanosize Tips with Extremely Low Onset Fields

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...

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Bibliographic Details
Published in:ACS nano 2009-09, Vol.3 (9), p.2617-2622
Main Authors: Hazra, Kiran Shankar, Rai, Padmnabh, Mohapatra, Dipti Ranjan, Kulshrestha, Neha, Bajpai, Reeti, Roy, Soumyendu, Misra, D. S
Format: Article
Language:English
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Summary: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 >106 with the onset field as low as 0.16 V/μm. 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.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn900674e