Comparative study of n-doping and p-doping of poly(3,4-ethylenedioxythiophene) electrosynthesised on aluminium

Aluminium was used as substrate for electropolymerisation of poly(3,4-ethylenedioxythiophene), PEDOT. The p- and n-doping behaviour of the PEDOT films was studied both electrochemically by cyclic voltammetry, and spectroscopically by in situ external reflection Fourier transform infrared spectroscopy during stepwise potential cycling of the films. The polymer films were also studied by resonance Raman spectroscopy with three different excitation wavelengths (514 nm, 633 nm and 780 nm). The surface morphology of the films was studied by scanning electron microscopy. The results indicate that PEDOT, polymerised on Al, is both p- and n-dopable, making it an interesting material for organic electronics applications.