Electron emission microscopy of nano-crystal graphitic films as high current density electron sources

F. A.M. Koeck, A. N. Obraztsov, R. J. Nemanich

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Electron emission can be described by thermionic and field effects or a combination of both and can be characterized by the laws of Richardson-Dushman and Fowler-Nordheim, respectively. Nano-crystal graphitic films exhibit a film morphology comprised mainly of crystalline graphite sheets which are vertically aligned with respect to the substrate surface. Field emission from these films exhibits a low threshold field of < 1 V/μm, an emission site density of ∼3 × 105/cm2 and a significant distribution in brightness. The temperature dependence of the emission is complex and may be influenced by molecular adsorbates and interface reactions. For nano-crystalline graphite films on molybdenum it was found that the emission current is significantly increased with temperature. The results suggest a field dependent barrier which may be an indication of field penetration.

Original languageEnglish (US)
Pages (from-to)875-879
Number of pages5
JournalDiamond and Related Materials
Volume15
Issue number4-8
DOIs
StatePublished - Apr 1 2006
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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