Anti-bacterial property of Hydrogen-free amorphous carbon coatings on Ar plasma-pretreated polytetrafluoroethylene (PTFE
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Anti-bacterial property of Hydrogen-free amorphous carbon coatings on Ar plasma-pretreated polytetrafluoroethylene (PTFE) with a-C:H:F interlayer
Hironari Umemoto1, Terumitsu Hasebe2, 1, Rumiko Kasai3, Yukihiro Yoshimoto1, So Nagashima4, Atsushi Hotta1, Tetsuya Suzuki1 1
Center for Science of Environment, Resources and Energy, Graduate School of Science and
Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan. 2 Department of Radiology, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji-shi, Tokyo, 192-0032 Japan. 3 Department of Radiology, Toho University Sakura Medical Center, 564-1 Shimoshizu, Sakura, Chiba 285-8741, Japan. 4 Institute for Multidisciplinary Convergence of Materials, Korea Institute of Science and Technology, Hwarang-no 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
ABSTRACT Amorphous carbon (a-C) films have a growing interest in the biological and medical field, as a coating material, due to their biocompatibility and antibacterial property. However, a-C films deposited directly on polymers often show adhesion failure. In this paper, two types of a-C films, amorphous hydrogenated carbon (a-C:H) film and hydrogen-free a-C (H-free a-C) film were deposited on polytetrafluoroethylene (PTFE) using a plasma deposition method. Prior to a-C film coating, the PTFE substrates were treated with Ar and O2 plasma and an appropriate interlayer was chosen to enhance the adhesion strength. The effect of the plasma pretreatment on the chemical composition of the PTFE was investigated by X-ray photoelectron spectroscopy (XPS). A T-peel test was carried out to evaluate the adhesion strength of the a-C coated PTFE. In the T-peel test, Ar plasma pretreatment improved the adhesion strength more effectively than that of O2 plasma pretreatment, because of the substantial defluorination and oxygen bonding occurred by Ar plasma pretreatment. Moreover, H-free a-C film reduced the numbers of Escherichia coli (E. coli) colonies dramatically, compared with original PTFE and a-C:H coated PTFE. Consequently, H-free a-C film coating can be a promising method to inhibit the increase of bacteria.
INTRODUCTION Polytetrafluoroethylene (PTFE) is extensively used for medical devices because of its chemical and mechanical stability [1]; however, it still has a risk of bacterial infection in the body [2]. Recently, amorphous carbon (a-C) film has attracted much attention as a coating material on medical devices owing to its outstanding properties. In addition, recent research reported that a-C films might enhance antibacterial properties [3]. However, it is known that direct deposition of a-C films onto polymer surface leads to poor coating adhesion and film cracking . To get rid of this problem, many researchers have studied about surface modification of the polymer and interlayers to solve the delamination between polymeric materials and a-C films [4, 5]. The present work was thus aimed at improving the adhesive property of a-C-based film on PTFE by plasma pretreatme
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