M. Lapkowski et al., Effects of the redox state on the morphology of the regioregular sexi-3-alkylthiophene, ELECTR ACT, 46(26-27), 2001, pp. 4001-4006
The electrochemical properties of solid phase alpha -monochloro substituted
regioregular 3-alkylthiophene consisting of six units of 3-octylthiophene
(6OT) were studied in nonaqueous electrolyte solutions using cyclic voltamm
etry and electrochemical atomic force microscopy (EC AFM). As confirmed by
voltammetry, the 6OT molecules in an oxidized form of monocation radical ar
e not subject to consecutive reactions, due to the presence of the alpha -s
ubstituent. In situ AFM images of the thin films of 6OT cast on metal subst
rates revealed reversible, drastic changes of the film morphology while app
lied potential was switched between values corresponding to the particular
redox state. Dimerization of the oligomers and pi -stacks formation is post
ulated to explain the observed morphology changes in the 6OT films. (C) 200
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