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- Title
Elimination of current non-uniformity in carbon nanotube field emitters.
- Authors
Verma, Preeti; Chaturvedi, Poornendu; Rawat, J.; Kumar, Manohar; Pal, Surendra; Bal, Mahesh; Rawal, D. S.; Harsh; Vyas, Hanuman; Ghosal, Partha; Bhatnagar, P.
- Abstract
Activation of abnormal emitting sites in Carbon Nano Tube (CNT) field emitters and their elimination is reported. CVD grown, patterned CNT was used as cathode for field emission studies. We encountered the problem of current non-uniformity in CNT cathode. This non-uniformity was attributed to abnormally active emitting sites during voltage ramp-up. The sudden increase in current resulted in region of positive slope in F–N curve, which can’t be explained by conventional F–N theory. Also the grown CNTs can be a mixture of metallic and semi conducting nature, which may cause deviation from the conventional F–N theory. We could eliminate abnormally active sites by electric field treatment, thereby increasing current uniformity and stability. The work is underway to understand the deviation in FN curve at high fields.
- Subjects
FIELD emission; CARBON nanotubes; CATHODES; ELECTRIC fields; ELECTRIC potential
- Publication
Journal of Materials Science: Materials in Electronics, 2007, Vol 18, Issue 6, p677
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-006-9079-2