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

F. A M Koeck, A. N. Obraztsov, Robert Nemanich

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 2006
Externally publishedYes

Fingerprint

Electron sources
electron sources
Electron emission
electron emission
high current
Microscopic examination
Current density
current density
microscopy
Crystals
Graphite
crystals
graphite
Crystalline materials
thermionics
Molybdenum
Adsorbates
Field emission
molybdenum
field emission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Electron emission microscopy of nano-crystal graphitic films as high current density electron sources. / Koeck, F. A M; Obraztsov, A. N.; Nemanich, Robert.

In: Diamond and Related Materials, Vol. 15, No. 4-8, 04.2006, p. 875-879.

Research output: Contribution to journalArticle

@article{181af6811b7549c4aec816acabb2bb0a,
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.",
author = "Koeck, {F. A M} and Obraztsov, {A. N.} and Robert Nemanich",
year = "2006",
month = "4",
doi = "10.1016/j.diamond.2005.12.051",
language = "English (US)",
volume = "15",
pages = "875--879",
journal = "Diamond and Related Materials",
issn = "0925-9635",
publisher = "Elsevier BV",
number = "4-8",

}

TY - JOUR

T1 - Electron emission microscopy of nano-crystal graphitic films as high current density electron sources

AU - Koeck, F. A M

AU - Obraztsov, A. N.

AU - Nemanich, Robert

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.

UR - http://www.scopus.com/inward/record.url?scp=33745280296&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745280296&partnerID=8YFLogxK

U2 - 10.1016/j.diamond.2005.12.051

DO - 10.1016/j.diamond.2005.12.051

M3 - Article

AN - SCOPUS:33745280296

VL - 15

SP - 875

EP - 879

JO - Diamond and Related Materials

JF - Diamond and Related Materials

SN - 0925-9635

IS - 4-8

ER -