Nano Archive

Field emission from carbon nanotubes grown on a tungsten tip

Sharma, R. B. and Tondare, V. N. and Joag, D. S. and Govindaraj, Achutharao and Rao, C. N. R. (2001) Field emission from carbon nanotubes grown on a tungsten tip. CHEMICAL PHYSICS LETTERS, 344 (3-4). pp. 283-286.

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Abstract

Field emission microscopy studies of carbon nanotubes grown by the pyrolysis of ferrocene on a tungsten field emitter are reported. A field emission current density of 1.5 Acm−2 has been drawn from such an emitter at a field of 290 V/μm, and this density is considerably higher than that found with planar cathodes. Accordingly, the field enhancement factor, calculated from the slope of the F–N plot in the low field region is also large. Field emission micrographs reveal the lobe structure symmetries typical of carbon nanotube bundles. The emission current is found to be remarkably stable over an operating period of more than 3 h for current values of up to 500 μA.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4108
Deposited By:JNCASR
Deposited On:02 Feb 2009 15:43
Last Modified:08 Apr 2009 13:06

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