Fig. 5: Overcoming ISFET cross sensitivities. | Nature Communications

Fig. 5: Overcoming ISFET cross sensitivities.

From: Selective ion sensing with high resolution large area graphene field effect transistor arrays

Fig. 5

a The changes in Ids for the different cation ISFETs with respect to concentrations of the cations, using the separate solution method. Linear fits were used to extract the Nikolskii selectivity coefficients. b Comparison of the measured K+ and \({{\rm{NH}}}_{4}^{+}\) concentrations by applying the Nikolskii-Eisenman formalism and the as prepared concentrations. The as prepared concentrations are determined from the solution volume and mass of the added salts. c Comparison of the measured Na+ and \({{\rm{NH}}}_{4}^{+}\) concentrations by applying the Nikolskii-Eisenman formalism and the as prepared concentrations.

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