Equivalent electric circuits for chemical sensors in the Langmuir regime

tThis paper presents an equivalent electric circuit model that describes adsorption-desorption processesoccurring on bio and chemical sensor surfaces under the Langmuir hypothesis and considers the followingpractical case: the pressure or concentration of the particles in the test chamber is not perturbed bythese processes and keeps its initial value, as in the cases of relatively high pressure or concentrationvalues with zero molecular flow, or in the presence of a molecular flow at any pressure or concentrationvalue. It is also pointed out that the equivalent circuit for Langmuir adsorption is similar to the circuitproposed for enzymatic reactions. Even if this work essentially covers theoretic aspects, a way is suggestedfor the possible experimental determination of both adsorption-desorption parameters and adsorption-desorption site density.