Patterned hydrophobic and hydrophilic surfaces of ultra-smooth nanocrystalline diamond layers

M. Mertens , M. Mohr , K. Brühne , H. J. Fecht , M. Łojkowski , Wojciech Święszkowski , Witold Łojkowski

Abstract

In this work, we show that ultra nanocrystalline diamond (UNCD) surfaces have been modified to add them hydrophobic and hydrophilic properties. The nanocrystalline diamond films were deposited using the hot filament chemical vapor deposition (HFCVD) technique. This allows growing diamond on different substrates which can be even 3D or structured. Silicon and, for optical applications, transparent quartz glass are the preferred substrates for UNCD layers growth. Fluorine termination leads to strong hydrophobic properties as indicated by a high contact angle for water of more than 100°. Hydrogen termination shows lesser hydrophobic behavior. Hydrophilic characteristics has been realised with oxygen termination. X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX) measurements confirm the oxygen and fluorine- termination on the nanocrystalline diamond surface. Further, by micropatterning using photolithography, multi-terminated layers have been created with both hydrophobic and hydrophilic areas. In addition, we have shown that retermination is achieved, and the properties of the surface have been changed from hydrophobic to hydrophilic and vice versa. Micro- roughness and stress in the grown film influences slightly the wetting angle as well. The opportunity to realize local differences in hydrophobicity on nanocrystalline diamond layers, in any size or geometry, offers interesting applications for example in microbiological investigations. Multi-terminated arrays show identical surface roughness and at the same time differences in hydrophobicity. These arrays have been visualized with scanning electron microscopy (SEM) and lateral force microscopy (LFM).
Author M. Mertens
M. Mertens,,
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, M. Mohr
M. Mohr,,
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, K. Brühne
K. Brühne,,
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, H. J. Fecht
H. J. Fecht,,
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, M. Łojkowski
M. Łojkowski,,
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, Wojciech Święszkowski ZPM
Wojciech Święszkowski,,
- Division of Materials Design
, Witold Łojkowski - Instytut Wysokich Ciśnień Polskiej Akademii Nauk (Instytut Wysokich Ciśnień Polskiej Akademii Nauk)
Witold Łojkowski,,
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Journal seriesApplied Surface Science, ISSN 0169-4332
Issue year2016
Vol390
Pages526-530
Publication size in sheets0.5
Keywords in EnglishNanocrystalline diamond; HFCVD; Micropatterning; Microbiological investigations
DOIDOI:10.1016/j.apsusc.2016.08.130
URL http://www.sciencedirect.com/science/article/pii/S016943321631786X
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.387 (2) - 2016=3.184 (5)
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