Spectroelectrochemistry with Ultrathin Ion-Selective Membranes: Three Distinct Ranges for Analytical Sensing.

ABSTRACT: We present spectroelectrochemical sensing of the potassium ion (K⁺) at three very distinct analytical ranges─nanomolar, micromolar, and millimolar─when using the same ion-selective electrode (ISE) but interrogated under various regimes. The ISE is conceived in the all-solid-state format: an ITO glass modified with the conducting polymer poly(3-octylethiophene) (POT) and an ultrathin potassium-selective membrane. The experimental setup is designed to apply a potential in a three-electrode electrochemical cell with the ISE as the working electrode, while dynamic spectral changes in the POT film are simultaneously registered. The POT film is gradually oxidized to POT⁺, and this process is ultimately linked to K⁺ transfer at the membrane-sample interface, atten

SUBMITTER: Liu Y 

PROVIDER: S-EPMC9244873 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature