Carbon nanotubes grown on cobalt-containing amorphous carbon composite films

Y. B. Zhang, Shu Ping Lau, L. Huang, B. K. Tay

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Carbon nanotubes (CNTs) have been produced on silicon wafer by filtered cathodic vacuum arc technique using cobalt-containing graphite targets followed by thermal chemical vapor deposition. The Co-containing amorphous carbon (a-C:Co) composite films have various contents of Co as a catalyst for CNTs growth. It is found that dense and random CNTs were grown on the a-C:Co composite film deposited using a 2 at.% Co-containing graphite target and nanoforest CNTs on the composite films using 5, 10 and 15 at.% Co-containing targets. The nanoforest CNTs using a 15 at.% Co-containing target have very good field emission properties with a low threshold field of 1.6 V/μm and a high and stable current density of 2.1 mA/cm2at 3 V/μm, which may result from the smaller diameter of CNTs. It is found that the field emission properties of the CNTs are significantly affected by the diameter of CNTs rather than its orientation.
Original languageEnglish
Pages (from-to)171-175
Number of pages5
JournalDiamond and Related Materials
Volume15
Issue number1
DOIs
Publication statusPublished - 1 Jan 2006
Externally publishedYes

Keywords

  • Carbon nanotubes
  • Co-containing amorphous carbon
  • Field emission

ASJC Scopus subject areas

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

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