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Detection of Cadmium and Copper Cations Using Amorphous Nitrogenated Carbon Thin Film Electrodes |
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| Authors: | Serigne Massamba Seck Stéphane Charvet Modou Fall Emmanuel Baudrin Michaël Lejeune Mohammed Benlahsen |
| Affiliation: | 1. Laboratoire de Physique de la Matière Condensée, UFR des Sciences d'Amiens, 33 rue Saint‐Leu, 80028 Amiens Cedex, France tel:+?33?3?22?82?76?28;2. Laboratoire de Chimie Physique Organique et d'Analyses Environnementales, Université Cheikh Anta Diop, BP 5005 Dakar‐Fann, Dakar, Sénégal;3. Laboratoire des Glucides, équipe THERA, CNRS FRE 3517, UFR de Pharmacie, Université de Picardie Jules Verne, 1 rue des Louvels, 80037 Amiens, France;4. Institut de Chimie de Picardie, FR3085 CNRS, Université de Picardie Jules Verne, 33 rue Saint‐Leu, 80039 Amiens Cedex France |
| Abstract: | Nitrogenous amorphous carbon (a‐CNx) thin films were deposited by radio‐frequency cathodic magnetron sputtering (13.56 MHz) on polished and etched titanium disks. While these films are cheaper to prepare than commonly reported carbon‐based electrodes, the usable electrochemical window in aqueous solution is within the same range and spans from ?1.5 to +1.8 V vs. SCE. The electrochemical reactivity was tested using the ferri‐ferrocyanide redox couple as a function of the thin films preparation parameters. The obtained electrochemical properties allow the use of these a‐CNx thin films for stripping electroanalysis of cations in water, minimizing potential solvent reactivity. Cadmium and copper were used to test these detection abilities. Better analytical properties (notably sensitivity and linearity) were obtained as compared to a commercial boron doped diamond electrode. Preliminary competition/interaction experiments for these two cations were performed. |
| Keywords: | Heavy metals Amorphous nitrogenated carbon Sputtering Ion sensors |