Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 16, Pages 7286-7290Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.03.082
Keywords
Gas barrier; Diamond-like carbon; PTFE; Process pressure; Adhesive strength
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Diamond-like carbon (DLC) films were deposited on polytetrafluoroethylene (PTFE) using radio frequency (RF) plasma-enhanced chemical vapour deposition (PE-CVD). Before the DLC coating, the PTFE substrate was modified with a N(2) plasma pre-treatment to enhance the adhesive strength of the DLC to the substrate. The influences of the N(2) plasma pre-treatment and process pressure on the gas permeation properties of these DLC-coated PTFE samples were investigated. In the Raman spectra, the G peak position shifted to a lower wave number with increasing process pressure. With scanning electron microscopy (SEM), a network of microcracks was observed on the surface of the DLC film without N(2) plasma pre-treatment. The density of these cracks decreased with increasing process pressure. In the film subjected to a N(2) plasma pre-treatment, no cracks were observed at any process pressure. In the gas barrier test, the gas permeation decreased drastically with increasing film thickness and saturated at a thickness of 0.2 mu m. The DLC-coated PTFE with the N(2) plasma pre-treatment exhibited a greater reduction in gas permeation than did the samples without pre-treatment. For both sample types, gas permeation decreased with increasing process pressure. (C) 2009 Elsevier B. V. All rights reserved.
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