In situ conductivity measurements on polyethylenedioxythiophene derivatives with different counter ions

3,4-Ethylenedioxythiophene (EDT) and thieno-(3,4-b)-2,3-dihydro-2-tetradecyl-1,4-dioxane (EDT C-14) were electrochemically deposited onto Pt using different electrolytes in acetonitrile. The resulting PEDT films containing different counter ions were subsequently characterized and their in situ conductivity values were measured using a two band electrode. The latter showed that the highest conductivities were obtained with ClO4- and BF4- as counter ions. Furthermore, the morphology, and thus the conductive properties, of the films seem to be strongly dependent on the applied polymerization potential. (C) 2002 Elsevier Science B.V All rights reserved.