| 1. |
- Janssens, Stoffel D., et al.
(författare)
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Evidence for phase separation of ethanol-water mixtures at the hydrogen terminated nanocrystalline diamond surface
- 2012
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 137:4, s. 044702-
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Tidskriftsartikel (refereegranskat)abstract
- Interactions between ethanol-water mixtures and a hydrophobic hydrogen terminated nanocrystalline diamond surface, are investigated by sessile drop contact angle measurements. The surface free energy of the hydrophobic surface, obtained with pure liquids, differs strongly from values obtained by ethanol-water mixtures. Here, a model which explains this difference is presented. The model suggests that, due to a higher affinity of ethanol for the hydrophobic surface, when compared to water, a phase separation occurs when a mixture of both liquids is in contact with the H-terminated diamond surface. These results are supported by a computational study giving insight in the affinity and related interaction at the liquid-solid interface.
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| 2. |
- Mukherjee, Debarati, et al.
(författare)
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Deposition of diamond films on single crystalline silicon carbide substrates
- 2020
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Ingår i: Diamond and related materials. - : Elsevier. - 0925-9635 .- 1879-0062. ; 101
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Tidskriftsartikel (refereegranskat)abstract
- Silicon carbide (SiC) is a wide band gap material that is slowly but steadily asserting itself as a reliable alternative to silicon (Si) for high temperature electronics applications, in particular for the electrical vehicles industry. The passivation of SiC devices with diamond films is expected to decrease leakage currents and avoid premature breakdown of the devices, leading to more efficient devices. However, for an efficient passivation the interface between both materials needs to be virtually void free and high quality diamond films are required from the first stages of growth. In order to evaluate the impact of the deposition and seeding parameters in the properties of the deposits, diamond films were deposited on SiC substrates by hot filament chemical vapor deposition (HFCVD). Before the seeding step the substrates were exposed to diamond growth conditions (pretreatment PT) and seeding was performed with a solution of detonation nanodiamond (DND) particles and with 6-12 and 40-60 mu m grit. Diamond films were then grown at different temperatures and with different methane concentrations and the deposits were observed in a scanning electron microscope (SEM); their quality was assessed with Raman spectroscopy.
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| 3. |
- Siang Yeap, Weng, et al.
(författare)
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Boron-Doped Diamond Functionalization by an Electrografting/Alkyne-Azide Click Chemistry Sequence
- 2014
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Ingår i: ChemElectroChem. - : Wiley. - 2196-0216. ; 1:7, s. 1145-1154
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Tidskriftsartikel (refereegranskat)abstract
- A straightforward protocol for the covalent functionalization of boron-doped diamond electrodes with either ferrocene or single-stranded deoxyribonucleic acid (DNA) is reported. The functionalization method is based on a combination of diazonium salt electrografting and click chemistry. An azide-terminated organic layer is first electrografted onto the diamond surface by electrochemical reduction of 4-azidophenyldiazonium chloride. The azidophenyl-modified surface then reacts rapidly and efficiently with molecules bearing a terminal alkyne moiety by means of Cu-1-catalyzed alkyne-azide cycloaddition. Covalent attachment of ferrocene moieties was analyzed by X-ray photoelectron spectroscopy and cyclic voltammetry, whereas impedance spectroscopy was applied for the characterization of the immobilized DNA.
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