Wettability of nanocrystalline diamond films

Ostrovskaya, L. Yu.; Perevertailo, V. M.; Ralchenko, V. G.; Saveliev, A.V.; Журавлев, В. Г.

doi:10.1016/j.diamond.2007.07.026

Cited by 61 publications

(25 citation statements)

References 22 publications

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“…The H4 shows a moderate level of lamellipodia attachment, and the PC12 line shows a very poor level of lamellipodia attachment. NCD has been shown by (Ostrovskaya et al, 2007) (via contact angle measurements of 75° -95°) to be a hydrophobic surface which is mainly due to the large amount of sp2 bonded graphitic defects along the crystal grain boundaries. As the NCD is intrinsic, there should be no appreciable surface charge level, but random charges may be present along defect boundaries, and the underlying n-type Si substrate may produce capacitive effects.…”

Section: Discussionmentioning

confidence: 99%

AFM and Cell Staining to Assess the In Vitro Biocompatibility of Opaque Surfaces

Frewin¹,

Oliveros²,

Weeber³

et al. 2012

Atomic Force Microscopy Investigations Into Biology - From Cell to Protein

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Section: Discussionmentioning

confidence: 99%

AFM and Cell Staining to Assess the In Vitro Biocompatibility of Opaque Surfaces

Frewin¹,

Oliveros²,

Weeber³

et al. 2012

Atomic Force Microscopy Investigations Into Biology - From Cell to Protein

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“…Nevertheless, wettability strongly depends upon surface roughness as actual surface area and the apparent surface free energy (the surface free energy per unit area multiplied by the actual surface area) increase with surface roughness. Ostrovskaya et al examined the wettability of nitrogen-incorporated NCD films after plasma treatments, however, the surface roughness was not taken into account [12]. Popov et al also examined the wettability of nitrogen-incorporated NCD films after plasma treatments, yet the minimum contact angle achieved was not notably low [13].…”

Section: Introductionmentioning

confidence: 98%

Wettability of plasma-treated nanocrystalline diamond films

Yang

Teii

2012

Diamond and Related Materials

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“…The phenomenon of the increase in the intensity of bands for stretching vibrations of CH x groups as a result of storage of oxidized nanoporous diamond films under normal conditions was first described in [25], and in [41] it was hypothesized that water vapor plays a role in this process. In fact, for annealing in air, in the UNC diamond spectra the absorption bands disappear that are due to CH x groups, where the corresponding sections of the diamond surface change from hydrophobic to hydrophilic [42]. As we know [43], after the diamond powder is kept just 5-10 minutes in air, intense absorption bands are recorded in the IR spectra with maxima at 3420 and 1625 cm the absorption bands for both the stretching and bending vibrations of hydroxyl groups was temporary, changing to a decrease over the course of a few hours, down to a level close to the level before annealing (Figs.…”

mentioning

confidence: 96%

Optical spectroscopy of the surface of nanoporous diamond films

et al. 2011

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We have studied the IR absorption spectra of samples of porous ultrananocrystalline diamond (UNC diamond) obtained by selective etching of the sp 2 phase in UNC diamond films. We show that the surface of porous UNC diamond is polyfunctional. We have studied the behavior of surface hydride, carbonyl, carboxyl, and hydroxyl groups as a function of annealing temperature in air and the time kept under normal conditions for UNC diamond films previously oxidized at 430 o C-450 o C. In the range from a few minutes to a few months, we studied the kinetics for establishment of the steady state for the functional adsorbed layer on the diamond surface under normal conditions. The observed growth in the intensity of the transmission bands due to hydride (CH x ) and other hydrogen-containing functional groups is explained by dissociation of water molecules on the surface of the UNC diamond films.Introduction. Diamond, a material with unique properties, has record high atomic density, thermal conductivity, speed of sound, and hardness, is optically transparent from the ultraviolet to the far IR range, and can operate under extreme conditions: at high temperatures and high radiation levels, in aggressive media [1]. Today it has become possible to obtain polycrystalline diamond by chemical vapor-phase deposition (CVD) in the form of plates of area equal to tens of square centimeters and thickness ranging from fractions of a micron to several millimeters. CVD diamond films (DFs) have been used as the basis to demonstrate prototypes for heat sinks, optical windows, x-ray apertures, ionizing radiation detectors, diodes, and other elements and devices [2]. The surface of diamond exhibits a broad range of electrochemical potential [3], can have negative electron affinity [4], and its coverage and accordingly its properties can be controlled. After treatment in a hydrogen plasma, the diamond surface becomes conducting (p type conductivity), and after oxidation it becomes insulating [5]. Based on the two-dimensional conductivity effect on the hydrogenated diamond surface, a new microwave field-effect transistor was fabricated with frequency f max up to 120 GHz [6]. Hydrogenation of the diamond surface is a necessary but not a sufficient condition for realization of high surface conductivity, which is apparent only when the diamond is in contact with the surrounding atmosphere [7], and the humidity of the air has a nonmonotonic effect on the surface conductivity of diamond [8]. In photochemical processes, a hydrogenated hydrophobic [9] diamond surface can add biomolecules via covalent bonds, while an oxidized hydrophilic diamond surface promotes molecular attraction and cell growth [10], where diamond is biocompatible and has low cytotoxicity [11]. Nanocrystalline CVD diamond films, owing to their smooth surface, their suitability for industrial production, their low cost when deposited on a substrate of large surface area and their compatibility with the electronic interface in devices with a planar configuration, are optimal materia...

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Wettability of nanocrystalline diamond films

Cited by 61 publications

References 22 publications

AFM and Cell Staining to Assess the In Vitro Biocompatibility of Opaque Surfaces

AFM and Cell Staining to Assess the In Vitro Biocompatibility of Opaque Surfaces

Wettability of plasma-treated nanocrystalline diamond films

Optical spectroscopy of the surface of nanoporous diamond films

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