Table 2 Nikolskii selectivity coefficients Kij for the three cation ISFETs with respect to three cations.

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

 Na+K+\({\mathrm{NH}}_{4}^{+}\)
Na+ ISFET19.13 × 10−41.99 × 10−4
K+ ISFET6.45 × 10−213.16 × 10−1
\({\rm{NH}}_{4}^{+}\) ISFET2.13 × 10−32.14 × 10−21