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

    31 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
    • General Chemistry
    • Mechanical Engineering
    • Materials Chemistry
    • Electrical and Electronic Engineering


    Dive into the research topics of 'Synthesis and mechanical properties of carbon nanotube/diamond-like carbon composite films'. Together they form a unique fingerprint.

    Cite this