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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Johansson, Ls
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Topics
Publications (8/8 displayed)
- 2021Mild alkaline separation of fiber bundles from eucalyptus bark and their composites with cellulose acetate butyratecitations
- 2019Effect of Power Density on the Electrochemical Properties of Undoped Amorphous Carbon (a-C) Thin Filmscitations
- 2019Nitrogen plasma surface treatment for improving polar ink adhesion on micro/nanofibrillated cellulose filmscitations
- 2017Amorphous carbon thin film electrodes with intrinsic Pt-gradient for hydrogen peroxide detectioncitations
- 2017Partially Reduced Graphene Oxide Modified Tetrahedral Amorphous Carbon Thin-Film Electrodes as a Platform for Nanomolar Detection of Dopaminecitations
- 2017Nanodiamonds on tetrahedral amorphous carbon significantly enhance dopamine detection and cell viabilitycitations
- 2016Characterization and Electrochemical Properties of Oxygenated Amorphous Carbon (a-C) Filmscitations
- 2004Viscoelastic properties of cationic starch adsorbed on quartz studied by QCM-Dcitations
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article
Effect of Power Density on the Electrochemical Properties of Undoped Amorphous Carbon (a-C) Thin Films
Abstract
<p>Undoped a-C thin films were deposited with varying power density from 10 to 25 W/cm<sup>2</sup> using unbalanced closed-field magnetron sputtering (CFUBMS). The effect of power density on the physical and electrochemical properties was investigated by experimental characterization methods and atomistic simulations. XPS indicated that the films were composed mostly of sp<sup>2</sup>-bonded carbon (55–58 at.%) with a small amount of oxygen (8–9 at.%) in the surface region. The films appeared completely amorphous in XRD. The I<sub>D</sub>/I<sub>G</sub> ratio obtained by Raman spectroscopy indicated an increase from 1.76 to 2.34 with power density. The experimental and simulated data suggested a possible ordering and/or clustering of the sp<sup>2</sup> phase with power density as the cause of the improved electrical properties of the a-C films. The electrochemical properties of a-C were between those of glassy carbon and tetrahedral amorphous carbon with potential windows ranging from 2.77 to 2.93 V and double-layer capacitance values around 0.90 μF cm<sup>−2</sup>. Electron transfer for Ru(NH<sub>3</sub>)<sub>6</sub> <sup>3+/2+</sup> and FcMeOH<sup>+1/0</sup> was reversible whereas that for IrCl<sub>6</sub> <sup>2−/3−</sup> was quasi-reversible. Peak potential separation of dopamine and oxidation potential of ascorbic acid decreased with power density, correlating with the structural and electrical changes of the films. The a-C thin films deposited by CFUBMS are inherently conductive and their physical properties can be adjusted by varying the deposition parameters to a wide range of electrochemical applications.</p>