Electrochemical sensors based on antimony tin oxide-Prussian blue screen-printed electrode and PEDOT-Prussian blue for potassium ion detection

The development and analytical applications of electrochemical sensors based on antimony tin oxide (ATO)–Prussian blue (PB) screen-printed electrode (SPE) and PEDOT-PB modified glassy carbon electrode are presented. The ATO-PB electrode was successfully applied in the electrochemical detection of K + ions. The detection and quantification limits value of 1.1 mM and of 3.7 mM, respectively, have been obtained. A high sensitivity of 0.035 A M −1 cm −2 has been also obtained. In addition, a sensing material based on poly(3,4-ethylenedioxythiophene) (PEDOT) and PB has been developed by a sinusoidal voltage electrochemical procedure and tested toward the potassium ion detection. The PEDOT-PB sensing material displayed the characteristic redox wave of the PB component and good analytical performance toward potassium ion detection. These results demonstrate the utility of the novel electrode materials in the development of electrochemical sensors for electroinactive analytes.