The influence of the structures and compounds of DLC coatings on the barrier properties of PET bottles |
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Authors: | Yang Li Wang Zhen-Duo Zhang Shou-Ye Yang Li-Zhen and Chen Qiang |
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Institution: | Laboratory of Plasma Physics and Materials, Beijing Institute of Graphic Communication, Beijing 102600, China |
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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. |
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Keywords: | diamond-like carbon film barrier properties |
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