Synergistic radical concentration increase in eumelanin-PEDOT:PSS blends: mammalian pigment-based doping for thermopower improvement.

Abstract

Moving from previous investigation of eumelanin and PEDOT:PSS blends we devised to explore the possible contribution of eumelanin to termopower improvement of PEODT:PSS in light of the well known radical character of the mammalian pigment. Determination of Seebeck coefficient and conductivity showed effective contribution of eumelanin blending to the PEDOT thermoelectric properties. Notably these effects correlate with a marked modification of paramagnetic features of both PEDOT and eumelanin after blending.