Abstract
Durable K + -selective chemically modified field effect transistors (CHEMFETs) with functionatized polysiloxane membranes have been developed. Polysiloxane membranes of different polarity, i.e., with different amounts of (cyanopropyl)siloxane groups, incorporating a free or covalently bound hemispherand as the ionophore and free or covalently bound tetraphenylborate axons as ionic sites, were investigated for their performance as sensing membranes. The CHEMFETs based on polysiloxane with both ionophore and anonic site covalently attached to the membrane matrix showed K + responses within almost Nerstian slope in the range of concentration 10 -4 -10 -1 M in the presence of 0.1 M Na + (log k K,NA Pot =-3.2)
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