Abstract
Single phase Na 0.44MnO 2 powder was synthetized by a classical solid-state reaction. Using a plastic technology, we studied the potentiometric response versus Na + ions in aqueous medium. A Nernstian-like response (55 mV/dec) was obtained for concentrations ranging from 1 M to 2 × 10 −4 M with a quite good selectivity towards Li +, K +, Mg 2+ and Ca 2+. Through an ageing study of this material in aqueous solution, we clearly identified the sensing material as being the Na 0.33MnO 2 phase. Furthermore, we proved that the sensing activity of this compound is routed in its ability to reversibly insert/de-insert Na + ions.
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