Preparation of fluorine-doped lead dioxide modified electrodes for electroanalytical applications

The effect of F- on the modified films of lead dioxide in morphology and structure was studied. The results obtained by cyclic voltammetry (CV), X-diffractometer (XRD) and scanning electron microscope (SEM) techniques indicated that F- could change the magnitude of lead dioxide crystal grain and the preferred crystallizing orientation on the substrate surface, even though it didn't change the basic structure of PbO2. When the modified electrode was applied as an analytical sensor to determine phenolic compounds, the linearity was in the range of 2 x 10(-5) - 1 x 10(-3) mol/L and the detection limit was 2.5 x 10(-6) mol/L. It was all found that the stability and reproducibility of the oxide-modified electrodes were improved by additional F-.