Abstract
Three-dimensional (3d) frameworks of fast-alkali conductors have promising properties for electrochemical sensors. Their conductivity is excellent at room temperature (about 10−4 to 10−3 S.cm−1), very much higher than the conductivity of usual membranes. They are sufficiently stable in water to be proposed as sensitive membranes in ISE devices. The mobile ions, such as sodium or other alkali ions, move through the structure from one site to another by 3d tunnels which are very well calibrated in size. The higher the mobility of an ion, the faster its exchange at the interface with the analyzed solution.
The selectivity effect is based on this phenomenon. NASICON materials are good examples from this point of view. The framework can be optimized by suitable cationic substitutions to adjust the size of the conduction sites and thus improve the selectivity effect. Recent experimental results in this field on Na+ and Li+ membranes are shown.
Résumé
Des milieux solides conducteurs de réseau tridimensionnel tel le NASICON presentent des propriétés intéressantes pour des capteurs électrochimiques. Leur conductivité est excellente à température ambiante, nettement plus élevée que celles des membranes habituelles. lis sont suffisamment stables dans l’eau pour être proposés comme membranes sensibles dans les dispositifs à électrode ionique sélective (ISE). Plus la mobilite d’un ion est élevée, plus ses échanges à l’interface avec la solution à analyser sont élevés, ce qui assure la sélectivité.
Le réseau peut être optimisé par des substitutions cationiques convenables pour régler la dimension des sites conducteurs et ainsi améliorer la sélectivité. Des résultats expériment aux récents sur des membranes à Na+ et a Li+ de ce type, sont présentés.
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Fabry, P., Khireddine, H., Cretin, M. (1998). Ionic Recognition Using Conducting Ceramics. In: Caliste, JP., Truyol, A., Westbrook, J.H. (eds) Thermodynamic Modeling and Materials Data Engineering. Data and Knowledge in a Changing World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72207-3_31
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DOI: https://doi.org/10.1007/978-3-642-72207-3_31
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