Synthesis and mechanical properties of carbon nanotube/diamond-like carbon composite films

Hiroshi Kinoshita, Ippei Ippei, Hirokazu Sakai, Nobuo Ohmae

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Diamond-like carbon (DLC) coatings were successfully deposited on carbon nanotube (CNT) films with CNT densities of 1 × 109/cm2, 3 × 109/cm2, and 7 × 109/cm2 by a radio frequency plasma-enhanced chemical vapor deposition (CVD). The new composite films consisting of CNT/DLC were synthesized to improve the mechanical properties of DLC coatings especially for toughness. To compare those of the CNT/DLC composite films, the deposition of a DLC coating on a silicon oxide substrate was also carried out. A dynamic ultra micro hardness tester and a ball-on-disk type friction tester were used to investigate the mechanical properties of the CNT/DLC composite films. A scanning electron microscopic (SEM) image of the indentation region of the CNT/DLC composite film showed a triangle shape of the indenter, however, chippings of the DLC coating were observed in the indentation region. This result suggests the improvement of the toughness of the CNT/DLC composite films. The elastic modulus and dynamic hardness of the CNT/DLC composite films decreased linearly with the increase of their CNT density. Friction coefficients of all the CNT/DLC composite films were close to that of the DLC coating.

Original languageEnglish
Pages (from-to)1940-1944
Number of pages5
JournalDiamond and Related Materials
Issue number11
Publication statusPublished - Nov 2007


  • Carbon nanotube
  • Composite film
  • Diamond-like carbon
  • Friction
  • Hardness
  • Toughening

ASJC Scopus subject areas

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


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