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The stretched polyaniline films doped by (±)-10-camphorsulfonic acid exhibited significant anisotropy of the electrical and thermoelectric properties. The thermoelectric figure-of-merit (ZT) of the stretched films in the direction parallel to the stretching direction is much higher than that of the unstretched counterpart, and moreover, the ZT increased with increasing drawing ratio. According to the experimental results of X-ray diffraction and UV-Vis-near IR spectroscopy the improvement of the ZT by the stretching process is revealed to be attributable to the increment of carrier mobility, which is proposed to be induced by the extended coil-like conformation of polyaniline.
Yan et al. (Thu,) studied this question.