Oxygen transmission of transparent diamond-like carbon films

Shinya Yamamoto, Hideyuki Kodama, Terumitsu Hasebe, Akira Shirakura, Tetsuya Suzuki

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


Recently, gas barrier properties of diamond-like carbon (DLC) films have been investigated and are started to apply to food packaging field such as an inner coating for polyethylene terephthalate (PET) bottles. Recycling PET bottles has been promoted on environmental and economic grounds. However, it is difficult to recycle DLC-coated PET bottles because of the brownish color of DLC films. In this study, we successfully synthesized transparent and colorless DLC films on PET substrates from CH4 and H2 gases by the RF-CVD method. Further, we investigated the relationship between oxygen transmission and optical transparency from the viewpoint of microstructure and hardness of the films. The results showed the optical transparency were gradually improved as decreasing RF power and increasing deposition pressure. In particular, the films deposited at 15 W and 40 Pa was almost completely transparent; however the oxygen transmission increased.

Original languageEnglish
Pages (from-to)1112-1115
Number of pages4
JournalDiamond and Related Materials
Issue number3-7
Publication statusPublished - 2005 Mar 1


  • Diamond-like carbon
  • Hardness
  • Microstructure
  • Optical properties

ASJC Scopus subject areas

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


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