Effects of anionic sites on the selectivity of sodium-sensitive CHEMFETs

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Calix[4]arene amides incorporated in poly(vinyl chloride) membranes provide good Na+ selectivity for CHEMFETs. A remarkable difference in the Na+/Ca2+ selectivity was observed depending on the presence or absence of tetraphenylborate ions in the membrane matrix. In the latter case the potentiometric selectivity coefficient (log KNa,CaPot) increased from −2.1 to −3.6. Calix[4]arene amides proved to be excellent ionophores to obtain Na+ selectivity in the presence of K+, i.e. log KNa,KPot = −2.7.
Original languageEnglish
Pages (from-to)195-198
JournalSensors and actuators. B: Chemical
Issue number16
Publication statusPublished - 1993


  • METIS-106748
  • IR-12567

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