Surface properties of differently prepared ultrananocrystalline diamond surfaces

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• 作者：W. Kulisch ; C. Popov ; D. Gillil ; G. Ceccone ; L. Sirghi ; A. Ruiz ; F. Rossi
• 关键词：Ultrananocrystalline diamond ; Surface modification ; Surface characterization ; PEG
• 刊名：Diamond and Related Materials
• 出版年：2009
• 出版时间：May-August 2009
• 年：2009
• 卷：18
• 期：5-8
• 页码：745-749
• 全文大小：511 K

文摘

Ultrananocrystalline diamond/amorphous carbon composite films have been deposited by microwave plasma chemical vapour deposition from 17 % CH₄/N₂ mixtures at 600 °C. Thereafter the films were subjected to various treatments (plasma processes, UV/O₃ exposure) to obtain hydrogen, oxygen, and fluorine terminated surfaces, which then have been characterized with respect to their composition, roughness, wettability, and other properties. Among others, it will be shown that H- and F-terminated surfaces are very stable even if exposed for long time to air, while O-terminated ones are prone to contaminations. H- and O-termination can be patterned by applying the UV/O₃ treatment through a mask. Finally, it will be shown that a non-fouling poly(ethylene glycol) layer can be grafted directly on oxygen terminated surfaces by an atom transfer radical polymerization process using α-bromoisobutyryl bromide as an initiator.