Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate and phenylalanine composite films

Abstract

Conductive films formed from composites of phenylalanine and poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS). The composite films formed by introducing aromatic amino acid phenylalanine in PEDOT:PSS improved the conductivity of the film to about 594 S/cm, a 400% increment compared to the conductivity of a pristine PEDOT:PSS film of about 1.5 S/cm. The conductivity can be tuned by adding a varying amount of phenylalanine in PEDOT:PSS. By further processing these composite films by treating them with methanol followed by annealing, conductivity of over 2200 S/cm can be achieved. In addition to increased conductivity, the composite films also have higher optical transmissivity compared to a native PEDOT:PSS polymer film with the composite thin film achieving transmittance of over 97%.

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