Membrane‐Free Detection of Metal Cations with an Organic Electrochemical Transistor

Alkali‐metal ions, particularly sodium (Na + ) and potassium (K + ), are the messengers of living cells, governing a cascade of physiological processes through the action of ion channels. Devices that can monitor, in real time, the concentrations of these cations in aqueous media are in demand not only for the study of cellular machinery, but also to detect conditions in the human body that lead to electrolyte imbalance. In this work, conducting...