Optical Properties of Solution of Polythiophene Derivatives as Functions of Alkyl Chain Length, Concentration and Temperature

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Abstract
Optical transmission through the cell of solutions of polythiophene derivatives such as poly(3-octylthiophene), poly(3-dodecylthiophene) and poly(3-dococylthiophene) has been found to change drastically with temperature and concentration. This transmission change is also dependent on the alkyl chain length. The critical temperature T c of the transition between two transmission states (opaque and transparent) increases with increase in both concentration and chain legth. This phenomenon has been conjectured to originate in the change of light scattering due to some conformational transition of polymers in the solvent. An application of this phenomenon has also been proposed.