Abstract
A Ca 2+ sensor based on the admittance change of synthetic membranes supported on derivatized silicon electrodes is reported. The ion-sensitive membranes consist of mixed monolayers of phospholipid and the Ca 2+-ligand ETH 1001. The electrodes are characterized electrochemically and their sensor performances are described. Through ion complexation by the neutral ligand, electrical charges are incorporated in the low-dielectric-constant environment of the sensitive layer. The number of charged complexes and thus the membrane admittance depend on the ion content of the electrolyte. The membrane response to Ca 2+ and the competitive binding of other cations are studied. A non-competitive process is observed if several ionophores, each one specific for a different ion, are incorporated in the membrane. Mixed layers with tetradecyl-18-crown-6 and ETH 1001 show both K + and Ca 2+ sensitivity. These electrodes allow direct comparison with a previously reported K + sensor based on tetradecyl-18-crown-6.
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