Abstract
We develop a model of interaction of an analyte with a chemoresistive sensor based on an electroconducting polymer for an arbitrary stoichiometry. In the quasiequilibrium approximation, we derive analytic relations for the current through the sensor and investigate in detail the specific features of its behavior. We establish that the way of analyte inflow to a region containing the sensor with analyte has an essential effect on the current kinetics. It is revealed that the influence of stoichiometry on the evolution of the current in the initial stages of its increase and decrease is qualitatively different. We determine the equilibrium constants of reactions between an analyte and a sensor and propose a procedure for the estimation of the stoichiometry of the system under study
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