Conference paper Embargoed Access

Modeling Selectivity and Cross-sensitivity in membrane-based potentiometric sensors

Leandro Julian Mele; Pierpaolo Palestri; Luca Selmi

We propose a steady state model for ion selective membranes (ISM) as selectivity element in potentiometric sensors. The model solves the Poisson-Boltzmann equation, coupled to distributed chemical reactions between ionophores and two types of competing ions. We show that a Donnan potential arises when ionic sites are present, while selectivity is achieved only if using ionophore-doped ISMs. The model allows to evaluate cross-sensitivities and can explain steady state non-Nernstian responses. We also provide an application example of sensor parameter design supported by the proposed model.

Embargoed Access

Files are currently under embargo but will be publicly accessible after September 9, 2021.

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