Abstract
Different siloxane copolymers have been used as membrane materials for Ca 2+ selective chemically modified field effect transistors (CHEMFETs). CHEMFETs with 3-benzoylaminopropyl-functionalized polysiloxane membranes and 1 wt% borate anions are intrinsically selective for Ca 2+ ions. This selectivity can be further enhanced by the incorporation of a Ca 2+ selective 1,3 alternate calix[4]arene which is functionalized with four amido groups. The highest Ca 2+ selectivties were obtained with CHEMFETs containing this calix[4]arene ionophore in 3-cyanopropyl-functionalized polysiloxane membranes.
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