Repozytorium publikacji - Politechnika Gdańska

Glassy carbon electrodes modified by conductive polymers and membrane with derivatives of bis(benzo-15-crown-5) were tested as solid contact ion selective electrodes for K+ ions concentration determination. PEDOT with PSS, Cl- and ClO4- counter ions was electrochemically deposited onto glassy carbon substrates using four different electrochemical approaches (potentiostatic, galvanostatic, potentiodynamic and potentiostatic pulses). Scanning electron microscopy was applied to investigate influence of electrodeposition method on morphology of polymer films and drop-casted pseudo liquid membrane with an ionophore. The presence of the polymer film and method of deposition affect morphology of tested electrodes and sensing properties as well. The best sensing properties were obtained for the electrodes with biscrown as ionophore with polymer which have a developed surface prepared via potentiostatic pulses (logKK/Na = -5.6 using separate solution method (SSM)). Galvanostatic method of electrodeposition which resulted in relatively smooth layer of the PEDOT exhibited the poorest sensing properties for sensor with biscrown as ionophore (logKK/Na = -4.3 for SSM). All prepared sensors exhibited very favorable values of selectivity coefficients KK/Na (log KK/Na= -5.6 - -4.0). Detection limit equals to 10-7 M was achieved. The influence of pH for sensing properties were investigated for the selected electrodes.

Autorzy

• Maciej Jeszke link otwiera się w nowej karcie ,
• dr inż. Konrad Trzciński link otwiera się w nowej karcie ,
• dr hab. inż. Jakub Karczewski link otwiera się w nowej karcie ,
• prof. dr hab. inż. Elżbieta Luboch link otwiera się w nowej karcie