Similarities in the ‘cold’ electron emission characteristics of diamond coated molybdenum electrodes and polished bulk graphite surfaces

N. S. Xu, Yon-Hua Tzeng, R. V. Latham

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213 Citations (Scopus)

Abstract

Details are given of an experimental study of field emission characteristics of diamond-coated Mo electrodes: in particular, a transparent anode imaging technique was used to monitor the spatial distribution of the individual emission centres. This study has revealed the important fact that substantial emission can be obtained at fields as low as 5 MV nr1. In order to investigate the physical nature of the emission process, a comparative study has been made of emission obtained from a diamond-coated electrode and a bulk carbon graphite electrode. Significantly, it was found that both the graphite-rich diamond film and the diamond-rich graphite electrode shared a similar high- emissivity characteristic, with a high surface density of emission sites. It has also been noted that cvd diamond films have two important properties that are favourable to low-field cold electron emission, namely their negative electron affinity and the presence of graphite Inclusions.

Original languageEnglish
Pages (from-to)1776-1780
Number of pages5
JournalJournal of Physics D: Applied Physics
Volume26
Issue number10
DOIs
Publication statusPublished - 1993 Oct 14

Fingerprint

Diamond
Molybdenum
Graphite
Electron emission
electron emission
molybdenum
Diamonds
Graphite electrodes
graphite
diamonds
Diamond films
Electrodes
electrodes
Electron affinity
diamond films
Field emission
Spatial distribution
Anodes
negative electron affinity
Carbon

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

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title = "Similarities in the ‘cold’ electron emission characteristics of diamond coated molybdenum electrodes and polished bulk graphite surfaces",
abstract = "Details are given of an experimental study of field emission characteristics of diamond-coated Mo electrodes: in particular, a transparent anode imaging technique was used to monitor the spatial distribution of the individual emission centres. This study has revealed the important fact that substantial emission can be obtained at fields as low as 5 MV nr1. In order to investigate the physical nature of the emission process, a comparative study has been made of emission obtained from a diamond-coated electrode and a bulk carbon graphite electrode. Significantly, it was found that both the graphite-rich diamond film and the diamond-rich graphite electrode shared a similar high- emissivity characteristic, with a high surface density of emission sites. It has also been noted that cvd diamond films have two important properties that are favourable to low-field cold electron emission, namely their negative electron affinity and the presence of graphite Inclusions.",
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AU - Xu, N. S.

AU - Tzeng, Yon-Hua

AU - Latham, R. V.

PY - 1993/10/14

Y1 - 1993/10/14

N2 - Details are given of an experimental study of field emission characteristics of diamond-coated Mo electrodes: in particular, a transparent anode imaging technique was used to monitor the spatial distribution of the individual emission centres. This study has revealed the important fact that substantial emission can be obtained at fields as low as 5 MV nr1. In order to investigate the physical nature of the emission process, a comparative study has been made of emission obtained from a diamond-coated electrode and a bulk carbon graphite electrode. Significantly, it was found that both the graphite-rich diamond film and the diamond-rich graphite electrode shared a similar high- emissivity characteristic, with a high surface density of emission sites. It has also been noted that cvd diamond films have two important properties that are favourable to low-field cold electron emission, namely their negative electron affinity and the presence of graphite Inclusions.

AB - Details are given of an experimental study of field emission characteristics of diamond-coated Mo electrodes: in particular, a transparent anode imaging technique was used to monitor the spatial distribution of the individual emission centres. This study has revealed the important fact that substantial emission can be obtained at fields as low as 5 MV nr1. In order to investigate the physical nature of the emission process, a comparative study has been made of emission obtained from a diamond-coated electrode and a bulk carbon graphite electrode. Significantly, it was found that both the graphite-rich diamond film and the diamond-rich graphite electrode shared a similar high- emissivity characteristic, with a high surface density of emission sites. It has also been noted that cvd diamond films have two important properties that are favourable to low-field cold electron emission, namely their negative electron affinity and the presence of graphite Inclusions.

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