Low threshold field emission from nanocrystalline diamond/carbon nanowall composite films

C. Y. Cheng, M. Nakashima, Kungen Tsutsui

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Two methods of substrate scratching pretreatment using diamond powder are employed to control the wall spacing in carbon nanowalls (CNWs). The surface after scraping for undulation has continuous undulant scratches with a number of residual diamond grains exclusively along the scratches, while that after scratching with ultrasonic vibration it shows irregular distributions of residual diamond grains and scratches, depending upon the size of the diamond powder. Nanocrystalline diamond film/CNW composites are obtained with either pretreatment method by microwave plasma-enhanced chemical vapor deposition. With increase of the duration of scratching, the morphology of the deposits changes from CNWs to a film/CNW composite and lastly to CNWs on a film, accompanied by an overall increase in wall spacing. The turn-on field for field emission decreases from 2.1 V/μm without scratching down to 1.2 V/μm with scratching due to suppression of electric field screening between the walls as evidenced by the larger field enhancement factor up to ~ 2700.

Original languageEnglish
Pages (from-to)40-44
Number of pages5
JournalDiamond and Related Materials
Volume27-28
DOIs
Publication statusPublished - Jul 1 2012

Fingerprint

Diamond
Carbon films
Composite films
Field emission
field emission
Diamonds
Carbon
diamonds
composite materials
thresholds
carbon
Powders
pretreatment
spacing
Diamond films
Composite materials
Plasma enhanced chemical vapor deposition
Vibrations (mechanical)
Screening
diamond films

All Science Journal Classification (ASJC) codes

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

Cite this

Low threshold field emission from nanocrystalline diamond/carbon nanowall composite films. / Cheng, C. Y.; Nakashima, M.; Tsutsui, Kungen.

In: Diamond and Related Materials, Vol. 27-28, 01.07.2012, p. 40-44.

Research output: Contribution to journalArticle

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