Enhanced electron emission from functionalized carbon nanotubes with a barium strontium oxide coating produced by magnetron sputtering

Carbon ◽  
2007 ◽  
Vol 45 (3) ◽  
pp. 587-593 ◽  
Author(s):  
Feng Jin ◽  
Yan Liu ◽  
Christopher M. Day ◽  
Scott A. Little
Keyword(s):  
Carbon Nanotubes ◽  
Magnetron Sputtering ◽  
Electron Emission ◽  
Oxide Coating ◽  
Strontium Oxide ◽  
Functionalized Carbon Nanotubes ◽  
Barium Strontium

A New Thermionic Cathode Based on Carbon Nanotubes with a Thin Layer of Low Work Function Barium Strontium Oxide Surface Coating

2008 ◽  
Vol 1142 ◽  
Author(s):  
Feng Jin ◽  
Yan Liu ◽  
Scott A Little ◽  
Chris M Day
Keyword(s):  
Work Function ◽  
Current Density ◽  
Enhancement Factor ◽  
Thermionic Emission ◽  
Field Enhancement ◽  
Oxide Coating ◽  
Emission Current Density ◽  
Emission Current ◽  
Strontium Oxide ◽  
Barium Strontium

ABSTRACTWe have created a thermionic cathode structure that consists of a thin tungsten ribbon; carbon nanotubes (CNTs) on the ribbon surface; and a thin layer of low work function barium strontium oxide coating on the CNTs. This oxide coated CNT cathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive oxide coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 1.9 eV were obtained. At 1221 K, a thermionic emission current density of 1.22A/cm2 in an electric field of 1.1 V/μm was obtained, which is four orders of magnitude greater than the emission current density from the uncoated CNT cathode at the same temperature. The high emission current density at such a modest temperature is among the best ever reported for an oxide cathode.

Barium strontium oxide coated carbon nanotubes as field emitters

2007 ◽  
Vol 90 (14) ◽  
pp. 143114 ◽  
Author(s):  
Feng Jin ◽  
Yan Liu ◽  
Christopher M. Day
Keyword(s):  
Carbon Nanotubes ◽  
Strontium Oxide ◽  
Field Emitters ◽  
Barium Strontium ◽  
Coated Carbon
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