Novel geometry of carbon nanotube field emitter to achieve high current densities for terahertz sources

Author

Silan, Jeremy L. ; Niemann, Darrell L. ; Ribaya, Bryan P. ; Rahman, Mahmud ; Meyyappan, M. ; Nguyen, Cattien V.

Author_Institution

NASA Ames Res. Center, Moffett Field, CA, USA

fYear

2009

fDate

28-30 April 2009

Firstpage

86

Lastpage

87

Abstract

We introduce a novel geometry carbon nanotube field emitter array capable of achieving high current densities. Arrays of patterned vertically aligned CNT bundles, with an open center similar to the structure of a donut, was grown directly on bulk metallic substrates. This new carbon nanotube structure, with larger edge area for enhanced edge effect, reached current densities as high as 60 mA/cm² at an applied DC field of less than 8 V/mum.

Keywords

carbon nanotubes; current density; field emitter arrays; terahertz waves; C; bulk metallic substrates; carbon nanotubes; current densities; field emitter array; terahertz sources; vertically aligned CNT bundles; Carbon nanotubes; Cathodes; Chemicals; Current density; Electron sources; Geometry; Laboratories; NASA; Space technology; Thermal conductivity; carbon nanotube; edge effect; field emission; field screening effect; geometry; terahertz sources;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2009. IVEC '09. IEEE International

Conference_Location

Rome

Print_ISBN

978-1-4244-3500-5

Electronic_ISBN

978-1-4244-3501-2

Type

conf

DOI

10.1109/IVELEC.2009.5193381

Filename

5193381