Conductive Polymer Nanoparticles as Solid Contact in Ion-Selective Electrodes Sensitive to Potassium Ions

A preparation method of nanocomposites based on poly (3-octylthiophene-2,5-diyl) (POT) and carbon black (CB) as the transducer of an all-solid potassium ion selective electrode is proposed. POT is used as the dispersant of CB, and the obtained nanocomposites have unique characteristics, including high conductivity, high capacitance and high stability. The potassium ion selective electrode based on POT and CB was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry. The results showed that the detection limit of potassium ions was 10(-6.2) M, and the slope was 57.6 +/- 0.8 mV/facade. The water layer test and anti-interference test show that the electrode has high hydrophobicity, the static contact angle reaches 139.7 degrees and is not easily affected by light, O-2 and CO2.

Automated summary

A method of preparing nanocomposites for an all-solid potassium ion selective electrode using poly (3-octylthiophene-2,5-diyl) (POT) and carbon black (CB) as the transducer is proposed. The nanocomposites obtained, with POT as the dispersant, exhibit unique characteristics including high conductivity, high capacitance, and high stability. Characterization of the potassium ion selective electrode based on POT and CB was done using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry. Results showed a detection limit of potassium ions at 10(-6.2) M and a slope of 57.6 +/- 0.8 mV/decade. Water layer and anti-interference tests demonstrated high hydrophobicity of the electrode with a static contact angle of 139.7 degrees, and resistance to light, O-2, and CO2 interference.