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

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

doi:10.1016/j.diamond.2005.12.051

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 journal › Article › peer-review

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 language	English (US)
Pages (from-to)	875-879
Number of pages	5
Journal	Diamond and Related Materials
Volume	15
Issue number	4-8
DOIs	https://doi.org/10.1016/j.diamond.2005.12.051
State	Published - Apr 2006
Externally published	Yes

ASJC Scopus subject areas

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

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10.1016/j.diamond.2005.12.051

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title = "Electron emission microscopy of nano-crystal graphitic films as high current density electron sources",

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.",

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AU - Koeck, F. A.M.

AU - Obraztsov, A. N.

AU - Nemanich, R. J.

PY - 2006/4

Y1 - 2006/4

N2 - 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.

AB - 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.

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

Abstract

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