Surface properties of differently prepared ultrananocrystalline diamond surfaces

• Published in: Diamond and related materials Vol. 18; no. 5; pp. 745 - 749
• Main Authors: Kulisch, W., Popov, C., Gilliland, D., Ceccone, G., Sirghi, L., Ruiz, A., Rossi, F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2009; Elsevier
• Subjects: Chemical vapor deposition (including plasma-enhanced cvd, mocvd, etc.); Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Ion and electron beam-assisted deposition; ion plating; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; PEG; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Plasma applications; Plasma-based ion implantation and deposition; Solid-fluid interfaces; Surface characterization; Surface modification; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Ultrananocrystalline diamond; Wetting; Ultrananocrystalline diamond; Surface modification; PEG; Surface characterization; Methane; Amorphous thin film; Fluorine; Roughness; Plasma assisted processing; Polymerization; Surface treatments; Surface analysis; Polyethylene glycols; Surface structure; Thin films; CVD; Ethylene oxide polymer; Wettability; Composite materials; Ultraviolet irradiation; Bromides; Surface properties; Microwave discharge; Plasma deposition
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2009.01.005

Ultrananocrystalline diamond/amorphous carbon composite films have been deposited by microwave plasma chemical vapour deposition from 17% CH 4/N 2 mixtures at 600 °C. Thereafter the films were subjected to various treatments (plasma processes, UV/O 3 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/O 3 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.