MARIA DANIELA POP, OANA BRINCOVEANU, MIHAELA CRISTEA, GEORGE OCTAVIAN BUICA, MARIUS ENACHESCU, ELEONORA MIHAELA UNGUREANU AFM AND SEM CHARACTERIZATION OF CHEMICALLY MODIFIED ELECTRODES BASED ON 5-<(AZULEN-1-YL) METHYLENE>-2-THIOXOTHIAZOLIDIN-4-ONE Preparation and microscopy characterization of polymer modified glassy carbon electrodes based on (5-<(azulen-1-yl) methylene>-2-thioxothiazolidin-4-one (L) were reported. Atomic Force Microscopy was used to investigate the morphological and mechanical properties of the deposited polyL films onto glassy carbon. The topography images of the analyzed samples exhibited the presence of some columnar shape features onto the layer surfaces. The surface roughness of the layers deposited at constant charge calculated from topography images, increased with the more positive applied potential for controlled potential electrolysis. At different charges, the roughness parameter showed the same behavior for the layers obtained applying a constant potential without having a noticeable influence on the adhesion properties on the substrate. Analysis using scanning electron microscopy shows a relatively uniform surface arrangement of the polymer and the presence of some clusters which are disturbing the planarity. PolyL chemically modified electrodes have been used for heavy metal ions detection with best results for lead.
Keywords: 5-<(azulen-1-yl) methylene>-2-thioxothiazolidin-4-one, modified electrodes, Atomic Force Microscopy, Scanning Electron Microscopy, lead(II) detection.