POLYSILOXANE BASED CHEMFETS FOR SELECTIVE DETECTION OF CA2+ IONS

Different siloxane copolymers have been used as membrane materials for Ca2+ selective chemically modified field effect transistors (CHEMFETs ). CHEMFETs with 3-benzoylaminopropyl-functionalized polysiloxane memb ranes and 1 wt% borate anions are intrinsically selective for Ca2+ ion s. This selectivity can be further enhanced by the incorporation of a Ca2+ selective 1,3 alternate calix[4]arene which is functionalized wit h four amido groups. The highest Ca2+ selectivties were obtained with CHEMFETs containing this calix[il]arene ionophore in 3-cyanopropyl-fun ctionalized polysiloxane membranes. (C) 1997 Elsevier Science B.V.