A comparative study of field emission from NanoBuds, nanographite and pure or N-doped single-wall carbon nanotubes

V. I. Kleshch, T. Susi, A. G. Nasibulin, E. D. Obraztsova, A. N. Obraztsov, E. I. Kauppinen

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Field emission characteristics of multi-emitter flat cathodes prepared from NanoBuds, few-layer graphite flakes (nanographite, NG) and pure or N-doped single-wall carbon nanotubes (SWNTs) have been examined. The cathodes demonstrated a low-voltage electron emission with the threshold field values of few Volts per micron, which were ascribed to the high-aspect ratio of nanocarbons. The films of NanoBuds and NG possess excellent emission pattern homogeneity with an emission site density of more than 105 cm-2. This is much higher than for cathodes made of conventional SWNT films. It was found that the achievable maximal current density depends on the type of carbon material and reaches 10 A/cm2 for NanoBuds film, while for the NG film cathodes, it is about one order of magnitude less. Possible mechanisms responsible for the experimentally observed differences are discussed. The materials examined are of great interest due to their high-emission characteristics and are promising for the development of new types of vacuum electronic devices.

Original languageEnglish
Pages (from-to)3051-3054
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume247
Issue number11-12
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

Keywords

  • Carbon nanotubes
  • Field emission
  • NanoBuds
  • Nanocarbons
  • Nanographite

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