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

C. Y. Cheng, M. Nakashima, K. Teii

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


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
Publication statusPublished - Jul 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering


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