Journal
NANOTECHNOLOGY
Volume 20, Issue 14, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/14/145306
Keywords
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Funding
- National Institutes of Health [PN2EY016586]
- National Science Foundation [NSF EF-05-07086, CHE-0641523]
- New York State Office of Science, Technology, and Academic Research (NYSTAR)
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Diamond-like carbon (DLC) films, used as molds for nanoimprint lithography, were treated with a fluorocarbon-based plasma in order to enhance their anti-adhesion properties. While ellipsometry and atomic force microscope measurements showed negligible changes in thickness and surface roughness after plasma processing, contact angle measurement found fluorine plasma-treated DLC surfaces to be highly hydrophobic, with surface energy values reduced from similar to 45 mJ m(-2) for untreated films to similar to 20-30 mJ m(-2) after fluorination. X-ray photoelectron spectroscopy revealed a thin (from similar to 0.5 to similar to 3 nm) fluorocarbon layer on the DLC surface. Proposed mechanisms for the formation of this layer include two competing processes: etching of DLC and deposition of fluorocarbon material, with one or the other mechanism dominant, depending on the plasma conditions. Fluorocarbon plasma-treated DLC molds for nanoimprint lithography were used to pattern sub-20 nm size features with a high degree of repeatability, demonstrating an extended lifetime of the anti-adhesion coating.
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