In situ AFM and conductivity measurements of regioregular oligoalkylthiophenes during electrochemical doping

Electrochemical properties of regioregular oligomers of 3-octylthiophene de posited as a film covering gold or platinum electrode are presented. In sit u measurements of conductivity were carried out during oxidation process. T hese measurements revealed that tetramer is subject of consecutive dimeriza tion reactions whereas hexamer produces a stable cation-radical. AFM in sit u observations demonstrate a "life" of the oligomer film driven by phase tr ansitions due to conformational changes of molecules stimulated by applied potential.