中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5401-5405.doi: 10.1088/1674-1056/18/12/046

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

The influence of the structures and compounds of DLC coatings on the barrier properties of PET bottles

杨莉, 王正铎, 张受业, 杨丽珍, 陈强   

  1. Laboratory of Plasma Physics and Materials, Beijing Institute of Graphic Communication, Beijing 102600, China
  • 收稿日期:2009-01-05 修回日期:2009-03-07 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality (Grant No PHR IHLB 06001).

The influence of the structures and compounds of DLC coatings on the barrier properties of PET bottles

Yang Li(杨莉), Wang Zhen-Duo(王正铎), Zhang Shou-Ye(张受业), Yang Li-Zhen(杨丽珍), and Chen Qiang(陈强)†   

  1. Laboratory of Plasma Physics and Materials, Beijing Institute of Graphic Communication, Beijing 102600, China
  • Received:2009-01-05 Revised:2009-03-07 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality (Grant No PHR IHLB 06001).

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摘要： To reduce the oxygen transmission rate through a polyethylene terephthalate (PET) bottle (an organic plastic) diamond-like carbon (DLC) coatings on the inner surface of the PET bottle were deposited by radio frequency plasma-enhanced chemical vapour deposition (RF-PECVD) technology with C2H2 as the source of carbon and Ar as the diluted gas. As the barrier layer to humidity and gas permeation, this paper analyses the DLC film structure, composition, morphology and barrier properties by Fourier transform infrared, atomic force microscopy, scanning electron microscopy and oxygen transmission rate in detail. From the spectrum, it is found that the DLC film mainly consists of sp3 bonds. The barrier property of the films is significantly relevant to the sp3 bond concentration in the coating, the film thickness and morphology. Additionally, it is found that DLC film deposited in an inductively coupled plasma enhanced capacitively coupled plasma source shows a compact, homogeneous and crack-free surface, which is beneficial for a good gas barrier property in PET bottles.

Abstract: To reduce the oxygen transmission rate through a polyethylene terephthalate (PET) bottle (an organic plastic) diamond-like carbon (DLC) coatings on the inner surface of the PET bottle were deposited by radio frequency plasma-enhanced chemical vapour deposition (RF-PECVD) technology with C2H2 as the source of carbon and Ar as the diluted gas. As the barrier layer to humidity and gas permeation, this paper analyses the DLC film structure, composition, morphology and barrier properties by Fourier transform infrared, atomic force microscopy, scanning electron microscopy and oxygen transmission rate in detail. From the spectrum, it is found that the DLC film mainly consists of sp3 bonds. The barrier property of the films is significantly relevant to the sp3 bond concentration in the coating, the film thickness and morphology. Additionally, it is found that DLC film deposited in an inductively coupled plasma enhanced capacitively coupled plasma source shows a compact, homogeneous and crack-free surface, which is beneficial for a good gas barrier property in PET bottles.

Key words: diamond-like carbon film, barrier properties

中图分类号:  (Thin film structure and morphology)

  • 68.55.-a
68.37.Hk (Scanning electron microscopy (SEM) (including EBIC)) 68.37.Ps (Atomic force microscopy (AFM)) 68.55.Nq (Composition and phase identification) 78.30.Jw (Organic compounds, polymers) 81.15.Gh (Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.))