Spectroelectrochemical studies of the C-14-alkyl derivative of poly(3,4-ethylenedioxythiophene) (PEDT)

Spectroelectrochemical properties and electrical resistivity of an alkyl de rivative of the poly(3,4-ethylenedioxythiophene), PEDT-C-14 were investigat ed. The oxidative doping process of this polymer was studied by means of cy clic voltammetry, UV-vis-NIR optical absorption, Raman scattering and Elect ron Paramagnetic Resonance (EPR). The in situ conductivity on a Pt microele ctrode was also monitored. Optical spectroscopies permit to follow the evol ution of the different species that are present. Combination of these diffe rent techniques leads to the characterisation of the charged species that a re induced by doping, and a mechanism of the modification of the electronic structure of PEDT-C-14 is proposed. (C) 2001 Elsevier Science Ltd. All rig hts reserved.