Counterion-induced processibility of polyaniline: Thermoelectric power.

Abstract

The temperature dependence of the thermoelectric power was investigated for the emeraldine salt form of polyaniline protonated with camphor sulfonic acid (PANI-CSA) and for blends of PANI-CSA with poly(methyl methacrylate) (PANI-CSA/PMMA). The thermoelectric power (S) of PANI-CSA increases linearly in proportion to the temperature with S\ensuremath{\approxeq}+10 \ensuremath{\mu}V/K at room temperature. This characteristic behavior persists when the fraction of PANI-CSA is diluted as a blend in insulating PMMA, even at volume fractions of PANI-CSA as low as about 1%. We discuss the PANI-CSA results in the context of transport at the metal-insulator boundary. The data from the blends are consistent with charge transport along the self-organized interconnected pathways of PANI-CSA in PMMA.