We report on the thermoelectric properties of the polyaniline hydrochloride as a function of the temperature. In order to stress the influences of both the synthesis and the samples preparation on the thermoelectric efficiency, we have systematically measured the electrical conductivity, the thermopower, and the thermal conductivity. We show that several parameters such as the polymerization temperature and the pressure used to compress powders are crucial in order to optimize the thermoelectric performance. The microscopic origins of the transport coefficients are also discussed. In particular, the overall dataset of the measured electrical conductivity is found to scale onto a master curve involving a unique microscopic length, which coincides with the total bond length of the repeating unit of the polymeric chain. We believe that the drawn conclusions can hold for most of the conducting polymers and are thus potentially generic.

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