Calibration of ion-selective electrodes
(ISEs) is cumbersome, time-consuming,
and constitutes a significant limitation for the development of single-use
and wearable disposable sensors. To address this problem, we have
studied the effect of ion-selective membrane solvent on ISE reproducibility
by comparing tetrahydrofuran (THF) (a typical solvent for membrane
preparation) and cyclohexanone. In addition, a single-step integration
of semiconducting/transducer polymer poly(3-octylthiophene) (POT)
with single-walled carbon nanotubes (SWCNTs) into the paper-based
ISEs (PBISEs) substrate was introduced. PBISEs for potassium and sodium
ions were developed, and these ISEs present outstanding sensor performance
and high potential reproducibility, as low as ±1.0 mV (n = 3).
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