Abstract
Conducting homo-, bilayered- and co-polymers of 3-methylthiophene (MT) and N-methylpyrrole (NMPy) were electrochemically deposited on platinum electrode. Electrochemical investigation of the resulting films was achieved using cyclic voltammetry and chronocoulometry. The diffusion coefficients were calculated in case of using different films of different thicknesses. The synthesis and testing the films in presence of different types of electrolytes and solvents were studied. The results showed that a memory effect caused by the synthesis anion affects further interaction between the film and the test anion which consequently affect the diffusion coefficient. The charge spacing effect caused by the type of electrolyte is more pronounced in the case of PMPy compared to PMT. Also, diffusion coefficient values were calculated for films with different thickness prepared from different monomers feed ratios in different electrolytes and solvents. Some of them showed similar trend to the homo-polymers. For conducting bilayers, the inner layer influences the redox process of the bilayer. This can be showed from the cyclic voltammetry measurements and diffusion coefficient calculations. FTIR measurements proved the incorporation of both individual monomers in the copolymer films. TGA proved that the thermal stability of the copolymer increased by increasing NMPy content. On the other hand, surface morphology revealed by SEM showed a distinct difference between homo- and co-polymeric structures.