Tuning the Electrical Conductivity and Self-Assembly of Regioregular Polythiophene by Block Copolymerization: Nanowire Morphologies in New Di- and Triblock Copolymers We gratefully acknowledge support from the NSF (CHE-9807707).

Simply changing the solvent or evaporation conditions enables the physical properties of polythiophene block copolymers and polyurethane elastomers to be controlled. The copolymers all have high conductivities as well as excellent film-forming and good mechanical properties, and well-defined nanowires that reach lengths in the micron range can be formed (see atomic force microscopy image).