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Enhanced Wettability of Nanocrystalline Diamond Films for Biocoating Applications

Published online by Cambridge University Press:  10 January 2012

Jason H. C. Yang  and
Kungen Teii
Jason H. C. Yang
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Kungen Teii
Affiliation:
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
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Abstract

Nanocrystalline diamond (NCD) films are prepared from Ar-rich/N2/CH4 and Ar-rich/H2/CH4 mixtures by microwave plasma-enhanced chemical vapor deposition, and further treated by microwave hydrogen and oxygen plasma exposures separately to enhance the wetting property. The hydrogen plasma treatment has small effect on the surface roughness, while the oxygen plasma treatment forms fine protrusions on the film surface. Results show that the wettability of the hydrogen plasma treated NCD film is nearly constant or little improvement as the polar component of the apparent surface free energy is close to the as-deposit NCD film. In contrast, the wettability of the oxygen plasma treated NCD film is improved dramatically such that the contact angle is reduced from 92º and 4.7º to almost 0º for water and 1-bromonaphthalene, respectively, and the polar component increases significantly to 34 mJ/m2. The low contact angle suggests that the film is considerably a cell adhesive friendly surface, which is essential in maintaining multicellular structure, and thus making it a favorable wetting surface for biological and biomedical applications.

Keywords

diamondnanostructuresurface chemistry
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1395: Symposium N – Diamond Electronics and Biotechnology–Fundamentals to Applications V , 2012 , mrsf11-1395-n12-18
Copyright
Copyright © Materials Research Society 2012

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